Co-reporter:Yong Ma;Chunping Hou;Hao Zhang;Mingtao Qiao;Yanhui Chen;Hepeng Zhang;Zhanhu Guo
Journal of Materials Chemistry A 2017 vol. 5(Issue 27) pp:14041-14052
Publication Date(Web):2017/07/11
DOI:10.1039/C7TA03279J
Although some polyaniline (PANI) morphologies have been reported, their synthesis with regular structures in multiple dimensions has met with limited success. Here, well-defined PANI spheres, roses, cloud-like and rhombic plates, layered flowers, columns, blocks, and dendrites were prepared by employing static surfactant systems in a 0.010 M HCl solution at room temperature. The acquisition of these multi-dimensional (MD) nanostructures was a result of the fact that aniline and the newly formed PANI molecules were subjected to a synergistic effect of soft templates and self-assembly processes. Detailed electrochemical measurements were performed to investigate the capacitance of these MD nanostructures. PANI layered flowers possessed the highest specific capacitance of 272 F g−1 at the current density of 1.0 A g−1 due to their morphologies. Additionally, two factors including the surfactant dosage and the pH value were evaluated to discern their impacts on the PANI morphologies. The method presented herein renders the possibility for fabricating regular MD PANI nanostructures. And these nanostructures also have potential to be applied in supercapacitor electrodes and energy storage.
Co-reporter:Zafar Ali;Lei Tian;Baoliang Zhang;Nisar Ali;Muhammad khan
New Journal of Chemistry (1998-Present) 2017 vol. 41(Issue 16) pp:8222-8231
Publication Date(Web):2017/08/07
DOI:10.1039/C7NJ01912B
Paramagnetic mesoporous fibrous silica (Fe3O4@KCC-1) was prepared and its surface was functionalized with 3-aminopropyltriethoxysilane (APTES) to obtain amino functionalized magnetic nanoparticles. Lipase from Candida rugosa was immobilized on functionalized magnetite Fe3O4@KCC-1-NH2 using glutaraldehyde (GLU) as the linker. The nanoparticles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), vibrating sample magnetometry (VSM) and Fourier transformed infrared spectroscopy (FTIR). The characterization results revealed successful immobilization of lipase on functionalized magnetite with a saturation magnetization of 62.73 and 42.65 emu g−1 for magnetic nanoparticles and carbonyl functionalized carriers, respectively. The applied approach for support preparation, activation, and optimization of immobilization conditions, with a good lipase loading of 283 mg g−1 of carrier, provided better resistance to temperature and pH inactivation than free lipase and hence expanded the reaction pH and temperature regions, with an optimum pH of 6 and temperature of 35 °C. Immobilized Lipase Candida rugosa (ICRL) showed enzyme activity of 630 U g−1, maintained above 560.7 U g−1 (89%) of the initial activity after 28 days and 434.7 U g−1 (69%) after 10 cycles. Thus, ICRL showed improved storage stability and reusability.
Co-reporter:Yi Tian, Wei Li, Chenhui Zhao, Yufei Wang, Baoliang Zhang, Qiuyu Zhang
Applied Catalysis B: Environmental 2017 Volume 213(Volume 213) pp:
Publication Date(Web):15 September 2017
DOI:10.1016/j.apcatb.2017.05.026
•The carrier, H-mSiO2,provides photocatalyst with super adsorption performance.•H-mSiO2, as a light-storing material, works on photocatalytic process.•Interacted interfaces of BiOCl/PANI improve separation of electron-hole pairs.•The present of Pd NPs with LSPR makes BiOCl photoexcited at visible light.•Degradation rate of 140 °C HBPP5wt.% is 9.5 * 10−3 min−1, which is 13.3 times than HBP.A facile method was developed to synthesize a series of hollow mesoporous SiO2-BiOCl@PANI@Pd (HBPP) photocatalysts with super adsorption performance, plasmonic effect and fast interfacial charge migration. The samples were characterized by XRD, FETEM, FT-IR, XPS, DRS, etc. Photocatalytic degradation of methyl orange (MO) by HBPP composites was investigated.Results showed that the photocatalytic property of HBPP composite was superior to that of hollow mesoporous SiO2-BiOCl@PANI (HBP) composite under visible light irradiation, and the HBPP5wt% photocatalyst synthesized under 140 °C exhibits the highest photocatalytic activity. In this photocatalysis system, the orderly mesoporous opening structure of the hollow mesoporous SiO2 sphere could effectively facilitate the transfer of reactant molecules, and the existence of the internal cavities would effectively prolong the action time of the irradiated light for the multiple reflections. Moreover, the formation of interacted interfaces between the semiconductor BiOCl and conducting polymer (polyaniline) could effectively improve the separation of the photogenerated electron-hole pairs, and the palladium nanoparticles (Pd NPs) with strong localized surface plasmon resonance (LSPR) absorption band in the near-UV region could effectively induce the generation of the photoexcited electron-hole pairs in BiOCl, thus the as-obtained photocatalyst exhibits superior photocatalytic activity under visible light irradiation. The work may set foundation for application of the new photocatalyst of HBPP-based LSPR and make an important step forward remedying environmental pollution.Download high-res image (140KB)Download full-size image
Co-reporter:Xin Chen, Baoliang Zhang, Yin Liu, Chenhui Zhao, ... Qiuyu Zhang
Chemical Engineering Research and Design 2017 Volume 127(Volume 127) pp:
Publication Date(Web):1 November 2017
DOI:10.1016/j.cherd.2017.09.033
•Magnetic material MHPMs embedded with stretched chains of PAAS and MHPMs-C embedded without PAAS are prepared.•The rate constant of pseudo-second-order by MHPMs is much higher than other reported materials including MHPMs-C.•The effect of PAAS on adsorption performance is investigated.•The rapid adsorption process and mechanism by MHPMs are clarified.Monodisperse hollow porous magnetic particles (MHPMs for short) embedded with sodium polyacrylate (PAAS) and the calcinated product of MHPMs (referred to as MHPMs-C, embedded without PAAS) were prepared and evaluated as an adsorbent for the removal of neutral red from water. Both of the adsorption kinetics followed pseudo-second-order model while there was a significant difference between the two rate constants. The second-order rate constant (k2, 0.775 g mg−1 min−1) for MHPMs was 52 times higher than MHPMs-C and 16 times higher than a similar material on account of stretched PAAS. The maximum adsorption capacity of MHPMs was 61.5 mg g−1. However, the Langmuir isotherm model was not suitable for MHPMs-C. Both of the adsorption equilibrium data of MHPMs and MHPMs-C obeyed the Freundlich isotherm, indicating MHPMs was a better adsorbent. PAAS played a key role in the rapid adsorption process by MHPMs. And rate controlling steps were supposed to be passing through the adsorption equilibrium layers (AELs) and intraparticle diffusion of pollutant molecules. Remarkably, MHPMs could be regenerated for six times by HCl solution (pH 2) without decrease in performance showing good recycling ability. Besides, MHPMs exhibited strong affinity for amino groups in the selective adsorption experiments.
Co-reporter:Yong Ma, Chongyin Zhang, Chunping Hou, Hao Zhang, Hepeng Zhang, Qiuyu Zhang, Zhanhu Guo
Polymer 2017 Volume 117(Volume 117) pp:
Publication Date(Web):19 May 2017
DOI:10.1016/j.polymer.2017.04.010
•Regular PANI rhombic plates are produced via a CTAB micellar soft template route in low acid environment.•The appearance of PANI rhombic plates is attributed to the synergistic effect of the optimal pH value and suitable anions.•PANI rhombic plates exhibit water dispersibility, processability, and flow-induced color variation.Well-defined PANI rhombic plates are produced via a cetyl trimethyl ammonium bromide (CTAB) micellar soft template route in low acid environment. Lamellar micelles consisting of CTAB and ammonium persulfate (APS) molecules not only serve as both soft templates and oxidant for oxidative polymerization of aniline, but also provide intermolecular interactions to assemble two-dimensional PANI sheets to three-dimensional rhombic plates. Detailed mechanistic studies meanwhile reveal that fabricating such regular rhombic plates cannot be separated from the synergistic effect of the optimal pH value and suitable anions. The prepared PANI rhombic plates exhibit water dispersibility, processability, and flow-induced color variation, which is supposed to be attributed to the intermolecular interactions between residual CTAB molecules and PANI molecules. Using these rhombic plates as a model system, the results and strategies presented here provide insight into the general scheme of morphology and dimension control in the low acid environment for conducting polymers.Download high-res image (281KB)Download full-size image
Co-reporter:X. Fan, X. Jia, J. Liu, Y. Liu, H. Zhang, B. Zhang, H. Zhang, Q. Zhang
European Polymer Journal 2017 Volume 92(Volume 92) pp:
Publication Date(Web):1 July 2017
DOI:10.1016/j.eurpolymj.2017.03.060
•For the first time a colloid-formation and solubilization process is reported.•Hydrophilic hydroxyls and flexible ethers were generated during the polymerization.•Much shorter length of hydrophobic main chains due to the DPE were produced.•The hydroxyls, ethers and shorter chains resulted in the formation of PGMA solution.This work reports for the first time that milky poly(glycidyl methacrylate) (PGMA) colloids produced in the early stage of 1, 1-diphenylethene (DPE) controlled soap-free emulsion polymerization of GMA evolved into transparent polymer solution 90 min after the polymerization was initiated. Qualitative and quantitative analysis confirmed that during the polymerization, large amount of hydrophilic hydroxyls and flexible aliphatic ethers were generated by the ring-opening reactions of epoxy groups catalyzed by H+ which is a byproduct of the decomposition of potassium persulfate. As a control agent, DPE could dramatically decrease the polymerization degree of PGMA, resulting in much shorter hydrophobic main chains comparing with PGMA produced in the absence of DPE. The hydrophilic hydroxyls by ring-opening reaction and the shorter hydrophobic main chains by DPE controlled polymerization would facilitate water swelling into the polymers. The swelled polymers along with the aliphatic ethers and shorter main chains endowed the particles with flexible and proteiform, forming structures similar to transparent polymer solution rather than milky colloidal suspensions.Download high-res image (150KB)Download full-size image
Co-reporter:Chenhui Zhao;Ying Liang;Wei Li;Yi Tian;Xin Chen;Dezhong Yin
RSC Advances (2011-Present) 2017 vol. 7(Issue 83) pp:52614-52620
Publication Date(Web):2017/11/10
DOI:10.1039/C7RA10344A
In this paper, BiOBr/BiOCl/CQDs heterostructure microspheres were successfully synthesized via a facile solvothermal method. Then, the structures, morphologies, optical properties and photocatalytic performances were investigated. This research showed that the BiOBr/BiOCl/CQDs microspheres exhibited significantly enhanced photocatalytic performance compared with BiOBr/BiOCl. In the photocatalysis process of rhodamine B (RhB) under visible light irradiation, the highest photodegradation rate (0.0609 min−1) would be obtained when the weight percentage of CQDs was appropriate, which was about 2.8 times higher than that of BiOBr/BiOCl (0.0217 min−1). In this photocatalytic system, the enhanced photoactivity was mainly attributed to the heterojunction interface among CQDs, BiOBr and BiOCl, and enhanced light harvesting for the appropriate CQD introduction. The radical trapping experiments revealed that O2˙−, e− and h+ were the main active species during the photocatalysis process.
Co-reporter:Lei Tian;Xue Li;Jin Liu;Dewei Wan;Zafar Ali
Polymer Chemistry (2010-Present) 2017 vol. 8(Issue 35) pp:5327-5335
Publication Date(Web):2017/09/12
DOI:10.1039/C7PY00966F
Fast swelling strategies for constructing functional particle materials are currently being pursued. Herein, we report an efficient swelling procedure by regulating the glass transition temperature Tg of poly(glycidyl methacrylate) (PGMA) seed particles via copolymerization with n-butyl acrylate (nBA). Single-hole swollen seed particles are formed within 30 min. Moreover, diverse Janus-like monomer-swollen seed particles (MSSs) can also be obtained by adjusting the weight ratio of nBA, with a controlled swelling rate. Moreover, flower-like colloidal microparticles with tunable patches are fabricated after the polymerization of Janus MSSs. Miraculously, these flower-like microparticles are capable of being employed as colloidal surfactants to stabilize not only oil-in-water but also water-in-oil emulsions without any modification. More importantly, it further enriches the species of colloidal surfactants and promotes technological advance of fast swelling systems for constructing advanced functional materials on a large scale and at low cost.
Co-reporter:Lei Tian;Xue Li;Wenyan Wang;Zafar Ali
Journal of Materials Chemistry C 2017 vol. 5(Issue 31) pp:7830-7836
Publication Date(Web):2017/08/10
DOI:10.1039/C7TC01235G
Free-standing nanoparticle membranes, which are composed of inorganic nanoparticles and organic ligands, have attracted a lot of attention because of their excellent physical chemical properties and widespread applications such as in sensors, photonic crystals and SERS substrates. However, the self-assembly of micro-sized particles into a free-standing microparticle membrane, particularly actuated membranes, is still a burning challenge. Herein, we propose the concept of “microparticle gels” fully formed by anisotropic (core–satellite, yolk–shell) microparticles and design an uncustomary strategy that transforms micro-sized particles into microparticle gels by an acidification process. The as-prepared microparticle gels possess excellent film-forming properties, which benefit from chemical cross-linking and hydrogen bonding of open-loop epoxy groups. They are able to embed in a polyethylene terephthalate (PET) substrate at 120 °C to form a composite membrane with remarkable swelling properties. In addition, free-standing double-layered microparticle gel/PET membranes were formed on various substrates at lower temperatures with excellent self-stripping properties driven by asymmetric swelling in water. The self-stripping process can be controlled by salt concentration and stopped at a salt concentration of 25%.
Co-reporter:Yong Ma;Hao Zhang;Chunping Hou;Mingtao Qiao;Yanhui Chen
Journal of Materials Science 2017 Volume 52( Issue 6) pp:2995-3002
Publication Date(Web):2017 March
DOI:10.1007/s10853-016-0550-z
Polyaniline (PANI) multidimensional (MD) structures (i.e., flowers, sheets, and plates) are successfully synthesized by adjusting the dosage of cationic surfactant cetyltrimethylammonium chloride (CTAC) in the range of 0.050–0.50 g in static HCl solution (0.010 M) at room temperature without stirring. CTAC micellar templates consisting of quaternary ammonium cations and binary persulfate anions direct the fabrication of PANI MD structures. On the basis of the employment of CTAC, the effect of pH value on PANI morphologies is investigated in detail, and followed by the obtainment of other PANI structures, including nanobelts, net-like structures, and particulates. Among the PANI MD structures, PANI sheets in micron size have good dispersibility and excellent processability, which are due to the synergistic effect of PANI’s suitable size and appropriate CTAC molecules. The results and strategies presented here provide opportunities to obtain good water dispersibility to conduct polymer structures with big size.
Co-reporter:Xiangjie Li, Jingjing Zhou, Lei Tian, Yufei Wang, Baoliang Zhang, Hepeng Zhang, Qiuyu Zhang
Sensors and Actuators B: Chemical 2017 Volume 241() pp:413-421
Publication Date(Web):31 March 2017
DOI:10.1016/j.snb.2016.10.105
•A new anti-protein nonspecific adsorption MIPs was prepared by using AGET-ATRP.•MPC was introduced to reduce the nonspecific adsorption for improving selectivity.•The introducing way could avoid the negative influence of MPC on imprinted sites.•The length of MPC chain could be optimized to control the protein resistance effect.•After grafting MPC, the QMIPs decreased a little, while the IF increased markedly.A new anti-protein nonspecific adsorption polydopamine-based surface protein-imprinted magnetic microsphere was prepared by using surface imprinting and AGET-ATRP in this work. The highlights were as follows. Firstly, different from our previous work, we could guarantee that there was no anti-protein nonspecific adsorption MPC chain segment in the imprinted sites. This fact could eliminate the negative influence of MPC chain segment on imprinted sites and further ensure the high imprinting efficiency. Secondly, the length of MPC chain segment was optimized to weaken the influence of protein resistance effect on adsorption capacity on the premise of guaranteeing excellent anti-protein nonspecific adsorption. The results showed that the optimal dopamine layer thickness was 10 nm. The mass ratio of MPC and Fe3O4@SiO2@Pdop-MIPs-Br was determined as 12/1. Under such conditions, after the graft of MPC, the adsorption capacity of imprinted microspheres for BSA decreased only a little from 9.39 mg/g to 8.26 mg/g, whereas the imprinting factor increased markedly from 1.53 to 5.74, revealing the advantage of this work. Finally, the successful applications in protein recognition showed that the new strategy was expected to be an effective means for improving the detection sensitivity of molecularly imprinted biosensors.
Co-reporter:Hao Zhang, Jiaojun Tan, Yibin Liu, Chunping Hou, Yong Ma, Junwei Gu, Baoliang Zhang, Hepeng Zhang, Qiuyu Zhang
Materials & Design 2017 Volume 135(Volume 135) pp:
Publication Date(Web):5 December 2017
DOI:10.1016/j.matdes.2017.09.002
•An intriguing liquid-repellent “glue + particles” approach has been presented.•The coating based on a sol-gel silica network shows exceptional liquid-repellency.•The coating can restore the super liquid-repellent properties to multi-damages.•The sol-gel network integrates two mechanisms for a long-lived superamphiphobic coating.The “glue + particles” approach has presented an excellent idea for promoting the practicability of superamiphiphobic surfaces. However, strong polar materials, such as epoxy and polyurethane, are usually employed as adhesives. The superamphiphobic behavior will be immediately lost when parts of superhydrophobic particles are removed. Thus, a glue with robust self-healing liquid-repellence is desirable, but remains challenging to realize. Herein, a robust, self-healable, superamphiphobic film was fabricated by a liquid-repellent “glue + particles” approach. The coating based on a sol-gel network showed exceptional liquid-repellency to low surface tension liquids including ethanol. The designed coating is based on robust sol-gel network dangling fluoroalkyl chains which integrates the bonding and self-healing mechanisms for providing a longer usage life. It could withstand at least 400 cycles of abrasion under severe stress (45 kPa), strong acid/base solution, hot-liquids and smudge treatment without apparently changing the superamphiphobicity. This novel and effective coating system may be useful for the development of robust protective clothing for various applications.Download high-res image (150KB)Download full-size image
Co-reporter:Zafar Ali, Lei Tian, Baoliang Zhang, Nisar Ali, Muhammad Khan, Qiuyu Zhang
Enzyme and Microbial Technology 2017 Volume 103(Volume 103) pp:
Publication Date(Web):1 August 2017
DOI:10.1016/j.enzmictec.2017.04.008
•Synthesis of (Fe3O4@Sio2@Hollow@SiO2).•Synthesis of (Fe3O4@Sio2@Hollow@KCC-1).•Optimization studies of the conditions for immobilization on both the supports.•Stability studies of the immobilized lipase in different pH and temperature.•Storage and recycling studies of immobilized lipase as compare to the free lipase on both the carriers.The mesoporous yolk–shell nanoparticles (MYSNs), with a movable Fe3O4 core inside the hollow capsules, with two different morphologies (1) Fe3O4@SiO2@hollow@fibrous SiO2 (Yolk Shell-1) (2) Fe3O4@SiO2@hollow@mesoporousSiO2 (Yolk Shell-2) were fabricated as carriers for Candida rugosa lipase (CRL) immobilization, through a template-assistant selectively etching method. Firstly the hydrophilic Fe3O4 nanoparticles were synthesized according to the solvothermal method. Then, SiO2 shell was coated on the Fe3O4 nanoparticle surface by a sol–gel reaction. Subsequently, the resorcinol farmaldehyde (RF) shell was covered on the surface of as-prepared Fe3O4@SiO2 composites and sandwiched Fe3O4@SiO2@RF composites were formed, which were finally provided with mesoporous fibrous (KCC) in the Yolk Shell-1 and mesoporous Silica in the Yolk Shell-2(Non fibrous). After selectively etching CTAB and the middle RF layer, the two kinds of yolk/shells composites were obtained. By utilization of their large and open mesopores (20–50 nm) with good surface area (457.78–625.54 m2/g,) CRL was immobilized after amino functionalization using glutaraldehyde as a linker. The ICRL on Y.S-1, Y.S-2 showed good loading (797–501 mg/g) and enzyme activity of (1503–837 U/g) respectively. Thermal stability, resistance to pH, recycling and storage capacity were improved as compare to free lipase.Download high-res image (134KB)Download full-size image
Co-reporter:Hao Zhang, Yibin Liu, Chunping Hou, Yong Ma, Baoliang Zhang, Hepeng Zhang, Qiuyu Zhang
Surface and Coatings Technology 2017 Volume 331(Volume 331) pp:
Publication Date(Web):15 December 2017
DOI:10.1016/j.surfcoat.2017.10.039
•A smart two-layer self-healing network as a fabric coating was designed.•The superstrong sol-gel coating has a stable superamphiphobic ability.•The self-healing behavior still works regardless of severe abrasion or pollution.•The self-healing treatment only takes 10 min at 135 °C.Superamphiphobic surfaces with a rapid ability to autorepair from multiple damages are desirable for long-lived self-cleaning coatings. Previous studies have almost introduced such a self-healing surface against chemical or physical damage, however, the regeneration is out of work as stain accumulates over time. Herein, a low-maintenance superamphiphobic coating based on a smart two-layer self-healing network has been presented. The coated fabric can withstand at least 200 cycles of abrasion under a pressure of 45 kPa and strongly resist to UV radiation, boiling treatment, strong acid/base immersion and smudge treatment, without apparently changing the superamphiphobicity. Besides physical and chemical damages, the coating can even rapidly retain its super liquid-repellence against a long-term accumulation of smudge by using a short heating treatment. Such a rapid and multiple self-healing ability resulting from the smart two-layer network may be useful for the development of low-maintenance protective coatings.Download high-res image (244KB)Download full-size image
Co-reporter:Lei Tian;Xue Li;Dewei Wan;Zafar Ali
Polymer Chemistry (2010-Present) 2017 vol. 8(Issue 25) pp:3774-3777
Publication Date(Web):2017/06/27
DOI:10.1039/C7PY00475C
A simple and controllable strategy to synthesize polymer ellipsoids via the viscosity-induced deformation of spherical particles is proposed. These polymer ellipsoids can be employed as living seed particles to fabricate patchy ellipsoids with controlled protrusions. Most importantly, the methodology presented here will make a breakthrough in the preparation of ellipsoidal particles.
Co-reporter:Xingfeng Lei, Yanhui Chen, Mingtao Qiao, Lidong Tian and Qiuyu Zhang
Journal of Materials Chemistry A 2016 vol. 4(Issue 11) pp:2134-2146
Publication Date(Web):12 Jan 2016
DOI:10.1039/C5TC03391H
Low-dielectric polyimide (PI) is on high demand in the next generation of high-density and high-speed integrated circuits. The introduction of fluorine or pores into PIs has been reported to efficiently obtain low-dielectric properties, but unavoidably deteriorate the mechanical and/or thermal properties. Therefore, it is a great challenge for PI to decrease its Dk and simultaneously maintain its mechanical and thermal properties. Herein, a series of robust PI films were fabricated by copolymerizing amine-functionalized hyperbranched polysiloxane (HBPSi) with pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA). The outstanding dielectric properties were achieved in a 35 wt% HBPSi PI film, which exhibits a Dk as low as 2.24 (1 MHz), mainly owing to the enhanced free volume and dielectric confinement effect afforded by the bulky HBPSi. Meanwhile, 35 wt% HBPSi PI demonstrates remarkable thermal stability and admirable mechanical properties, with the glass transition temperature of 388 °C, 5% weight loss temperature in argon flow up to 554 °C, a tensile strength of 80.6 MPa, elongation at break of 13.7% and a tensile modulus of 1.36 GPa. It also demonstrates conspicuous film homogeneity and planarity with the surface roughness as low as 0.42 nm and good moisture resistance with water uptake less than 1.5%. The prominent comprehensive properties make HBPSi PI a strong candidate for the future interlayer dielectrics.
Co-reporter:Lei Tian;Panpan Zhao;Xiangjie Li;Shenqiang Wang;Zafar Ali;Baoliang Zhang;Hepeng Zhang
Macromolecular Rapid Communications 2016 Volume 37( Issue 1) pp:47-52
Publication Date(Web):
DOI:10.1002/marc.201500449
Co-reporter:Hao Zhang, Yong Ma, Jiaojun Tan, Xinlong Fan, Yibin Liu, Junwei Gu, Baoliang Zhang, Hepeng Zhang, Qiuyu Zhang
Composites Science and Technology 2016 Volume 137() pp:78-86
Publication Date(Web):12 December 2016
DOI:10.1016/j.compscitech.2016.10.023
In this work, we present one-step dip-coating strategy for fabricating robust, self-healing and superhydrophobic coatings using a coating solution that contains a novel branched thiol-ene fluorinated siloxane (T-FAS), polydimethylsiloxane (PDMS) elastomer and hydrophobic fumed silica nanoparticles (SiO2 NPs). The novel branched T-FAS, with low fluorinated surface energy and high sol-gel reactivity, was prepared by introducing (N-methyl-perfluorohexane-1-sulfonamide) ethyl acrylate (FSA) and γ-methacryloxypropyltrimethoxysilane (MPS) into pentaerythritol tetra (3-mercaptopropionate) (PETMP) via thiol-ene click reaction. The superhydrophobic coating, being high stable to strong acid, UV, thermal and smudge treatment, has a water contact angle of 165 ± 2° and shedding angle of 4 ± 1°. It can withstand at least 100 cycles of abrasion with 1500 grit sandpaper under 45 KPa due to the interpenetrating polymer networks (IPN) constructed by T-FAS/PDMS. The IPN is also self-healing to chemically etching using long perfluoro-terminated chains of T-FAS which can spontaneously reorient to new air interfaces. The robust self-healing IPN may lead to the development of new efficient strategies for durable protective coatings in various applications.
Co-reporter:Baoliang Zhang, Peitao Li, Hepeng Zhang, Xiangjie Li, Lei Tian, Hai Wang, Xin Chen, Nisar Ali, Zafar Ali, Qiuyu Zhang
Applied Surface Science 2016 Volume 366() pp:328-338
Publication Date(Web):15 March 2016
DOI:10.1016/j.apsusc.2016.01.074
Highlights
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Red-blood-cell-like BSA/Zn3(PO4)2 hybrid particles is prepared by a rapid method.
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Formation mechanism of the novel hybrid materials is illustrated in detail.
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The hybrid particles displayed excellent adsorption properties on Cu2+.
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This adsorbent shows potential application value in ultra-fast removal of Cu2+.
Co-reporter:Lidong Tian;Junwei Gu;Xingfeng Lei;Zhaoyuan Lv;Mingtao Qiao;Changjie Yin
Macromolecular Materials and Engineering 2016 Volume 301( Issue 5) pp:625-635
Publication Date(Web):
DOI:10.1002/mame.201600013
Co-reporter:Lili Fan, Baoliang Zhang, Hepeng Zhang, Xiangkun Jia, Xin Chen and Qiuyu Zhang
RSC Advances 2016 vol. 6(Issue 70) pp:65911-65920
Publication Date(Web):29 Jun 2016
DOI:10.1039/C6RA12764A
Fe3O4@P(GMA-DVB-MAA) magnetic composite microspheres were prepared by facile one-pot distillation–precipitation polymerization. The composite microspheres were formed using a P(GMA-DVB-MAA) copolymer as the shell and hollow magnetic Fe3O4 nanoparticles as the core. During the distillation–precipitation polymerization, non-modified Fe3O4 nanoparticles can be encapsulated and the thickness of the polymer shell layer can be adjusted by the amount of monomer used. The as-prepared particles showed excellent magnetic responsibility, well-defined core/shell structure and monodispersity. Lipase is one of the best biocatalysts which can catalyze a variety of reactions, such as alcoholysis, hydrolysis, aminolysis, esterification and transesterification. Fe3O4@P(GMA-DVB-MAA)–NH2 composite microspheres were obtained by modification of hexamethylenediamine and they were used for Candida rugosa lipase (CRL) immobilization. The immobilization conditions were systematically studied and the hydrolysis of olive oil emulsion was used for the examination of lipase activity. The characterization of the immobilized lipase indicated that the immobilization amount was up to 131.9 mg g−1 and that the relative activity remained at 65% after ten cycles. The immobilized lipase still held 41% relative activity after 140 h at 50 °C. All these results show that the immobilized lipase exhibited excellent thermal stability and reusability. This kind of immobilized lipase has great potential in industrial application because it is easy to separate from the system.
Co-reporter:Baoliang Zhang, Peitao Li, Hepeng Zhang, Lili Fan, Hai Wang, Xiangjie Li, Lei Tian, Nisar Ali, Zafar Ali and Qiuyu Zhang
RSC Advances 2016 vol. 6(Issue 52) pp:46702-46710
Publication Date(Web):28 Apr 2016
DOI:10.1039/C6RA05308D
Flower-like papain/Zn3(PO4)2 hybrid materials are synthesized via a facile, rapid and low-cost method in this study. The growth process of the nanoflowers has been studied in detail and a four-step formation mechanism, including coordination, precipitation, self-assembly and size growth, has been clarified. The concentration of papain mainly affects the morphology of the products by regulating the assembly and crystal growth. The enzyme activity of papain/Zn3(PO4)2 hybrid nanoflowers, a novel immobilized enzyme, was calculated by monitoring the hydrolysis reaction of casein. The results show that the catalytic properties of papain immobilized on hybrid nanoflowers are enhanced compared with that of free papain. The as-prepared hybrid nanoflowers exhibited excellent reusability, high thermo stability and long storage life. The results indicate that the well-designed materials have great potential in industrial applications.
Co-reporter:Mingtao Qiao, Xingfeng Lei, Yong Ma, Lidong Tian, Kehe Su, and Qiuyu Zhang
Industrial & Engineering Chemistry Research 2016 Volume 55(Issue 22) pp:6263-6275
Publication Date(Web):May 19, 2016
DOI:10.1021/acs.iecr.5b04814
Highly regulated core–shell Fe3O4@polypyrrole composite microspheres have been successfully prepared via chemical oxidative polymerization in the presence of poly(vinyl alcohol) and p-toluenesulfonic acid. The polypyrrole shell thickness can be adjusted from 20 to 80 nm with the variation of the pyrrole/Fe3O4 ratio. Investigations of the microwave absorbing properties indicate that the polypyrrole shell plays an important role, and the maximum reflection loss of composite microspheres can reach as much as −31.5 dB (>99.9% absorption) at 15.5 GHz with a matching layer thickness of 2.5 mm. Compared to the physically blended Fe3O4–PPy composites, Fe3O4@polypyrrole composite microspheres not only possess better reflection loss performance but also have a wider absorbing bandwidth of 5.2 GHz (12.8–18 GHz) in the Ku band, which may be attributed to the intensive synergistic effect of dielectric loss from polypyrrole shells and magnetic loss from Fe3O4 cores. Therefore, regulated core–shell Fe3O4@polypyrrole composite microspheres are postulated to be more promising in microwave absorption applications.
Co-reporter:Yong Ma, Chunping Hou, Hao Zhang, Hepeng Zhang, Qiuyu Zhang
Synthetic Metals 2016 Volume 222(Part B) pp:388-392
Publication Date(Web):December 2016
DOI:10.1016/j.synthmet.2016.11.001
•PANI solid microspheres with convex-fold surface are obtained.•The mechanism of PVP micellar template is reported.•The influence factors on the formation of PANI solid microspheres are investigated.Although various micro/nanostructures of polyaniline (PANI) have been reported, it still remains as a great challenge to produce PANI solid microspheres. Here, with the aid of polyvinylpyrrolidone (PVP) micellar template, PANI solid microspheres with convex-fold surface are readily prepared in a static HCl solution (0.010 M) at room temperature. The measured results of SEM, TEM, FTIR, XRD, XPS, and TGA demonstrate the successful preparation of PANI microspheres having solid structure. Moreover, the effects of concentration of HCl solution and surfactant types on the morphologies of PANI structures are investigated. The trick of forming such solid microspheres is ascribed to the synergistic effect of appropriate concentration of dopant acid, specific surfactant, and long alkyl chain of PVP molecules which has better solubilization effect on aniline molecules in comparison with other organic acid micellar templates.
Co-reporter:Panpan Zhao, Lei Tian, Xue Li, Zafar Ali, Baoliang Zhang, Hepeng Zhang, and Qiuyu Zhang
ACS Sustainable Chemistry & Engineering 2016 Volume 4(Issue 12) pp:
Publication Date(Web):September 28, 2016
DOI:10.1021/acssuschemeng.6b00967
Polyamidoamine (PAMAM) dendrimers have been widely applied in biomacromolecule immobilization, catalysis carriers, gene therapy, and drug delivery. However, there is still a lack of systematic research about lipase and protein immobilized by PAMAM dendrimers. Herein, we used three types of amine reagents to graft dendritic macromolecules on Fe3O4 nanoparticles and obtained a variety of Fe3O4@SiO2/PAMAM magnetic nanocarriers with different generations. The density of surface functional groups, the structure, and the length (generation) of the flexible chain play an important role in immobilizing Candida rugosa lipase (CRL). As a result, hexamethylenediamine (HMD) grafted dendritic magnetic carriers with the fourth generation (Gc-4) exhibited a superior performance in terms of immobilizing CRL. Then, polyethylenimine (PEI) instead of HMD was grafted to the Gc-4 to obtain a higher activity with respect to immobilized CRL (955.53 U/g) and free lipase. Furthermore, the immobilized CRL improved its tolerability performance in wider ranges of pH and temperature.Keywords: Flexible chains; Generations; Lipase immobilization; Magnetic nanocarriers; PAMAM dendrimers;
Co-reporter:Lei TianXue Li, Panpan Zhao, Zafar Ali, Qiuyu Zhang
Macromolecules 2016 Volume 49(Issue 24) pp:9626-9636
Publication Date(Web):December 6, 2016
DOI:10.1021/acs.macromol.6b02059
The use of single particles as building blocks for the design and construction of advanced materials is generally recognized as a promising approach. This paper reports a novel double-speed swelling (DSS) technique to fabricate solid–liquid asymmetric monomer-swollen particles (MSPs) with adjustable and removable liquid protrusions on the surface of non-cross-linked poly(glycidyl methacrylate) (PGMA) colloidal particles, although this procedure is thermodynamically unfavorable. Further, PGMA/polystyrene (PS) patchy microparticles with controllable morphologies are fabricated by a versatile and large-scale seeded emulsion polymerization (SEP) on the basis of these MSPs. The size and number of protrusions can be precisely regulated by the swelling ratio and the amount of polymerizable monomer. These patchy microparticles exhibit excellent light reflection and could be applied as new thermal barrier coatings. Additionally, the self-assembled “particle gel” membranes with superoleophilic properties have been employed to absorb model oil and exhibited efficient absorption performance.
Co-reporter:Xingfeng Lei
The Journal of Physical Chemistry C 2016 Volume 120(Issue 5) pp:2548-2561
Publication Date(Web):January 22, 2016
DOI:10.1021/acs.jpcc.5b11667
Currently, low-dielectric polyimides (PIs) such as fluorinated or porous PIs exhibit a low-dielectric property but have undesirable mechanical and/or thermal properties. Therefore, it is crucial to find a more considerate method that could lower the permittivity, while maintaining or improving the mechanical and thermal properties. Herein, a series of hyperbranched (HB) PI films were synthesized by adjusting the content of the rigid diamine, 2,2′-dimethylbenzidine (DMBZ). The dielectric properties of the HBPIs were accordingly tuned, that is, the permittivity of the resulting HBPIs decreased with increasing the DMBZ fraction owing to the enlarged free volume and the hindered dipole orientations afforded by the rigid DMBZ. The maximum mechanical strength of the resulting HBPIs located at the formulation made using 50% DMBZ and 50% ODA. At this formulation, the optimal comprehensive performances were achieved, that is, excellent tensile strength (124.1 MPa), desirable thermal stability (5% weight loss temperature up to 505 °C with weight residual of 56.7% at 800 °C under argon), high glass-transition temperature (324 °C), low relative permittivity (2.69, 1 MHz), reduced water absorption (∼1.86%), and good solubility. Our approach provides a new idea to fabricate low-dielectric PIs with good mechanical and thermal properties.
Co-reporter:Lei Tian;Panpan Zhao;Xue Li;Zafar Ali;Xiangjie Li;Baoliang Zhang;Hepeng Zhang; Qiuyu Zhang
ChemCatChem 2016 Volume 8( Issue 16) pp:2634-2641
Publication Date(Web):
DOI:10.1002/cctc.201600413
Abstract
Raspberry-shaped microparticles with adjustable protrusions and functional groups were synthesized and applied as carriers for the immobilization of lipase. The structural advantages of the raspberry-shaped microcarriers with immobilized lipase (RM-IL) are not only that the protrusions are constructed to play the role of a spacer arm, but the block structure enhances the bioactivity of lipase at the oil–water interface. The activation method used for the carrier has a significant effect on the performance of immobilized lipase. RM-IL prepared by carboxylic acid activation has a 3.5-fold increase of activity compared with that from amine activation and generates a fourfold increase of protein bound to 164 mg g−1 of carrier. Finally, RM-IL is used as an environmentally friendly and high-efficiency biocatalyst to catalyze the esterification of oleic acid for biodiesel under mild conditions, and the conversion can reach up to 82.1 %. Above all, raspberry-shaped microcarriers prepared by an improved seed emulsion polymerization have prospects for industrialization.
Co-reporter:Lei Tian;Panpan Zhao;Xue Li;Zafar Ali;Xiangjie Li;Baoliang Zhang;Hepeng Zhang; Qiuyu Zhang
ChemCatChem 2016 Volume 8( Issue 16) pp:
Publication Date(Web):
DOI:10.1002/cctc.201600970
Abstract
The front cover artwork for Issue 16/2016 is provided by researchers from Qiuyu Zhang's group, Northwestern Polytechnical University (P. R. China). The image shows raspberry-shaped microparticles with adjustable protrusions are designed and synthetized for lipase immobilization to catalyze esterification of oleic acid for biodiesel under mild condition. See the Full Paper itself at http://dx.doi.org/10.1002/cctc.201600413.
Co-reporter:Lei Tian;Panpan Zhao;Xue Li;Zafar Ali;Xiangjie Li;Baoliang Zhang;Hepeng Zhang; Qiuyu Zhang
ChemCatChem 2016 Volume 8( Issue 16) pp:
Publication Date(Web):
DOI:10.1002/cctc.201600961
Co-reporter:Wangchang Geng, Xiaowei He, Yuanwei Su, Jing Dang, Junwei Gu, Wei Tian, Qiuyu Zhang
Sensors and Actuators B: Chemical 2016 Volume 226() pp:471-477
Publication Date(Web):April 2016
DOI:10.1016/j.snb.2015.12.027
•Broadening response scope of PDEAEMA-based material from double- to triple-responsive.•Constructing a block copolymer is proved effective to improve humidity sensing performance.•Humidity sensing mechanism was discussed.We report on the synthesis and characterization of Poly (N,N-diethylaminoethyl methacrylate)-block-Polystyrene (PDEAEMA-b-PS) di-block copolymer. The synthesis was finished by using reversible addition-fragmentation chain transfer (RAFT) polymerization method. The investigation results of humidity sensing property of pure PDEAEMA, pure PS and PDEAEMA-b-PS di-block copolymer demonstrated that the block copolymer shown the best sensing performance. Its impedance changed more than three orders of magnitude in the range from 22% to 95% relative humidity. The hysteresis was less than 8% RH, the response and recovery time was 60 and 206 s, respectively. The humidity sensing mechanism was discussed based on complex impedance plots. This work broadens the responsive scope of PDEAEMA-based materials from double-responsive (pH and temperature) to multi-responsive (pH, temperature and humidity).
Co-reporter:Xiangjie Li, Jingjing Zhou, Lei Tian, Wei Li, Zafar Ali, Nisar Ali, Baoliang Zhang, Hepeng Zhang, Qiuyu Zhang
Sensors and Actuators B: Chemical 2016 Volume 225() pp:436-445
Publication Date(Web):31 March 2016
DOI:10.1016/j.snb.2015.11.082
Crosslinking degree is difficult to determine on the premise of simultaneously considering response performance and recognition capability in the thermosensitive imprinted materials due to their mutually contradictory relationship. In addition, the effect of thickness of thermosensitive imprinted layers on the recognition of target protein is also difficult to evaluate quantitatively. To solve these two problems, a series of thermosensitive magnetic imprinted microspheres with different crosslinking degree and imprinted layer thickness were fabricated. The adsorption results showed that imprinted layer thickness of 17 nm was the most appropriate for BSA imprinting. Crosslinking degree of 20% was determined as the balance point by simultaneously considering response performance and recognition capability. Under such conditions, the elution efficiency after once washing process was up to 78.60%, which guaranteed the satisfactory regeneration capability. The adsorption capacity and the imprinting factor could reach 42.01 mg/g and 3.41, respectively, which were greatly increased compared to those imprinted materials reported previously. Furthermore, the practical separation performance of the imprinted microspheres was investigated by separating BSA from the protein mixture sample, and the results were exciting. All these results indicated that these imprinted microspheres were expected to be applied to the rapid isolation and purification of BSA.
Co-reporter:Xinlong Fan, Xiangkun Jia, Yin Liu, Baoliang Zhang, Chunmei Li, Yali Liu, Hepeng Zhang and Qiuyu Zhang
Polymer Chemistry 2015 vol. 6(Issue 5) pp:703-713
Publication Date(Web):09 Dec 2014
DOI:10.1039/C4PY01347F
A facile one-step method to fabricate hierarchical structured coatings whose wettability could be easily tuned from hydrophilic (water contact angle, 9.3°) to superhydrophobic (water contact angle, 154.2°) by controlling the assembly temperature without any specialized equipment or additional modification is reported. The building blocks for the coatings, hierarchically raspberry-like poly(styrene-acrylic acid) (P(S-AA)) particles with 10 nm corona particles on the core, were produced via a one-step soap-free emulsion polymerization process accompanied by phase separation. The morphology and roughness of the raspberry-like particles can be conveniently regulated by adjusting the amount of S, AA and divinylbenzene (DVB). The chemical composition, crosslinking degree, hierarchical structure and roughness of the raspberry-like particles have significant influence on the wettability of the coatings. The transition of the wettability was attributed to a thermodynamic-driven process that hydrophobic components of the particles migrate toward the surface of the coatings and a decrease of the roughness of the hierarchical structure that was a result of softening and fusing of the particles at temperatures above the Tg of the copolymers.
Co-reporter:Wei Li, Xiangkun Jia, Peitao Li, Baoliang Zhang, Hepeng Zhang, Wangchang Geng, and Qiuyu Zhang
ACS Sustainable Chemistry & Engineering 2015 Volume 3(Issue 6) pp:1101
Publication Date(Web):April 27, 2015
DOI:10.1021/acssuschemeng.5b00033
In this paper, a novel visible-light-driven hollow mSiO2–BiOBr (H-mSiO2–BiOBr) nanophotocatalyst was successfully synthesized by a facile three-step method. First, the hollow mesoporous silica submicrospheres with orderly mesoporous opening structure and an independent internal cavity were synthesized by combining Stöber hydrolysis and chemical etching. Second, the hollow mesoporous silica submicrospheres were functionalized by 3-triethoxysilylpropylamine (APTES), then the amino-groups were successfully introduced into the surface of this material. Third, the BiOBr nanophotocatalyst with size of about 8–15 nm was successfully synthesized on the surface of the aforementioned amino-functionalized hollow mesoporous silica submicrospheres by solvothermal synthesis with the aid of the oriented function of the surface amino-groups. After several characterizations of the materials, the photocatalytic degradation of RhB by this H-mSiO2–BiOBr nanophotocatalyst under visible-light irradiation was investigated. The experimental results revealed that the photocatalytic activity of the H-mSiO2–BiOBr nanophotocatalyst was higher than that of the core–shell SiO2@mSiO2–BiOBr nanophotocatalyst under visible-light irradiation. More importantly, the nanoscale BiOBr photocatalyst, which was synthesized by controlling the addition amounts of the bismuth source, would lead to an increased band gap (1.47 eV), and it would further lead to the effective restraint for the recombination of the photoexcited electron–hole pairs. However, the rapid migration of the interface charges would enhance the photoactivity of this novel supported nanophotocatalyst significantly. Furthermore, the existence of the internal cavities of this novel nanophotocatalyst would lead to the multiple reflections of the irradiated light and effectively prolong its action time, which is also very conducive to the enhancement of the photoactivity of this supported nanophotocatalyst. Beyond that, the orderly mesoporous opening structure and the independent internal cavities can effectively facilitate the transfer of reactant molecules. This would lead to the enhanced photocatalytic performance of this novel supported BiOBr nanophotocatalyst.Keywords: Electron−hole pair; Hollow silica; Photocatalyst; Quantization; Rhodamine B;
Co-reporter:Yong Ma, Mingtao Qiao, Chunping Hou, Yanhui Chen, Mingliang Ma, Hepeng Zhang and Qiuyu Zhang
RSC Advances 2015 vol. 5(Issue 125) pp:103064-103072
Publication Date(Web):25 Nov 2015
DOI:10.1039/C5RA20330A
We successfully coated polyaniline (PANI) onto amino-Fe3O4 microsphere chains to form PANI-coated Fe3O4 microsphere chain (PFMC) composites without using any surfactants. Chaining the amino-Fe3O4 microspheres as templates was realized via a magnetic-field-induced (MFI) assembly process. The hydrogen bonding formed between amino-Fe3O4 microspheres and aniline molecules was the driving force of aniline polymerization on the surface of the microspheres rather than in solution. After the Fe3O4 microspheres cores were removed, PANI chain-like hollow spheres (PCHM) were obtained. The length and PANI shell thickness of PFMC composites and corresponding PCHM could be effectively tuned by employing different dosages of aniline. It was found that the PANI shell thickness d1, average interparticle separation d2, and PANI loading yield were linearly increased with increasing aniline dosage in a certain range. This effective method not only supports a simple approach to the PFMC composites and PCHM, but also demonstrates that a PANI coating shell can be easily formed via solely electrostatic interactions without the aid of surfactants.
Co-reporter:Xinlong Fan, Yin Liu, Xiangkun Jia, Shenqiang Wang, Chunmei Li, Baoliang Zhang, Hepeng Zhang and Qiuyu Zhang
RSC Advances 2015 vol. 5(Issue 115) pp:95183-95190
Publication Date(Web):22 Oct 2015
DOI:10.1039/C5RA17156C
We herein report a facile soap-free emulsion polymerization (SFEP) method to prepare living particles with size and molecular weight that could be easily regulated. In this method, commercially available, odorless, and colorless 1,1-diphenylethene with no known toxicity was introduced to decrease the size and molecular weight of the particles. Using styrene as a model monomer, a series of monodisperse PS particles with a mean diameter ranging from 89 nm to 307 nm and a molecular weight ranging from 613 g mol−1 to 11760 g mol−1 were produced via adjusting the amount of the monomer and DPE added into the SFEP system.
Co-reporter:Zafar Ali, Lei Tian, Panpan Zhao, Baoliang Zhang, Ali Nisar, Xiangjie Li, Hepeng Zhang and Qiuyu Zhang
RSC Advances 2015 vol. 5(Issue 112) pp:92449-92455
Publication Date(Web):09 Oct 2015
DOI:10.1039/C5RA14524D
Flower-like Fe3O4 microspheres prepared by a fast solvothermal method were selected to fabricate micron-sized Fe3O4@glycidyl methacrylate (GMA) magnetic porous microspheres. The magnetic porous microspheres were endowed with appropriate specific surface area (39.54 m2 g−1) and appropriate pore diameter (16 nm), and could serve as a carrier for immobilized lipase. Meanwhile, the prepared magnetic microspheres with high saturation magnetization could realize rapid separations. After those microspheres were aminated and activated, the obtained immobilized lipase possessed high efficiency of immobilization and catalytic activity, with the optimum pH and temperature of 8.0 and 40 °C, respectively. The thermal stability of immobilized lipase was obviously exceeding free lipase.
Co-reporter:Xiangkun Jia, Xinlong Fan, Yin Liu, Wei Li, Lei Tian, Lili Fan, Baoliang Zhang, Hepeng Zhang and Qiuyu Zhang
RSC Advances 2015 vol. 5(Issue 75) pp:60691-60697
Publication Date(Web):07 Jul 2015
DOI:10.1039/C5RA09088A
This work describes the synthesis and catalytic behavior of magnetic nanoparticle supported quaternary ammonium phase transfer catalysts Fe3O4@P(GMA–EGDMA)N+(CH3)3OH− (MQPTCs). The MQPTCs prepared by compositing P(GMA–EGDMA) on Fe3O4 magnetic nanoparticles via seeded emulsion polymerization and quaternized by trimethylamine were characterized by SEM, TEM, FTIR, TGA and VSM, and core–shell structured MQPTCs with an exchange capacity of 1.14 mmol g−1 were obtained. The catalytic activity of the MQPTCs was evaluated via the investigation of the efficiency of the conversion of benzyl alcohol and benzyl bromide into dibenzyl ether. In addition, the influences of the concentration of the catalysts and species of the catalysts (different exchange capacities of the MQPTCs) on conversion were studied in detail. The results demonstrated that the MQPTCs showed high efficiency with a conversion of 95% in only 6 h that was comparable with small molecule PTCs, and excellent reusability with a conversion of 94.1% after being reused 8 times.
Co-reporter:Wei Li, Yi Tian, Peitao Li, Baoliang Zhang, Hepeng Zhang, Wangchang Geng and Qiuyu Zhang
RSC Advances 2015 vol. 5(Issue 59) pp:48050-48059
Publication Date(Web):13 May 2015
DOI:10.1039/C5RA06894K
A rattle-type magnetic mesoporous Fe3O4@mSiO2@BiOBr hierarchical photocatalyst was successfully synthesized by a facile solvothermal method under the orientation of the surface amino-groups of rattle-type magnetic mesoporous Fe3O4@mSiO2 microspheres. Then, this photocatalyst was characterized via X-ray diffraction, transmission electron microscopy, field-emitting scanning electron microscopy, Fourier transform-infrared spectroscopy, X-ray photoelectron spectroscopy and vibrating sample magnetometry. Due to the presence of an inner cavity and orderly mesoporous opening structure, this novel photocatalyst exhibits superior adsorption and transfer performance to organic contaminants in aqueous systems. In particular, the complex between BiOBr and SiO2 had significantly increased absorption ability to visible-light due to the some extent of the direct contact of the interfaces of the two materials. Studies show that the assembly capacity of BiOBr nanosheets plays an important role in enhancing the photoactivity. Even though methylene blue is a relatively stable organic contaminant, it can still be decomposed completely by this novel photocatalyst in a very short amount of time (about 120 min). Encouragingly, the photoactivity of this novel photocatalyst is far higher (about 2.6 times) than that of pure BiOBr photocatalyst for its unique structure. According to the radical trapping experiments, the photogenerated holes (h+) and superoxide radicals (O2˙−) are considered to be the main active species that drive the photodegradation under visible-light irradiation. Due to the unique structures and fast interfacial charge transfer, this novel photocatalyst is absolutely a superior alternative visible-light-driven photocatalyst.
Co-reporter:Yong Ma, Mingtao Qiao, Yanhui Chen, Chunping Hou, Baoliang Zhang and Qiuyu Zhang
RSC Advances 2015 vol. 5(Issue 13) pp:9986-9992
Publication Date(Web):06 Jan 2015
DOI:10.1039/C4RA14723E
Electromagnetic Fe3O4@polyaniline (PANI) nanofibers with high aspect ratio were realized by combining magnetic-field-induced (MFI) self-assembly and in situ surface polymerization of aniline. The key to fabrication is to induce chaining of the amino-Fe3O4 microspheres during the PANI coating process, which allows additional deposited PANI to warp entire chains into nanofibers. Hydrogen bonds are thought to be the driving force that makes aniline form a PANI coating shell instead of irregular sheets. Compared to the Fe3O4@PANI microspheres, higher magnetization saturation value and conductivity value were achieved in the Fe3O4@PANI nanofibers, which hold high promise for potential applications in microwave absorbents, electromagnetic shielding coatings, and other usage associated with conventional electromagnetic techniques.
Co-reporter:Xiangjie Li;Jingjing Zhou;Lei Tian;Wei Li;Baoliang Zhang;Hepeng Zhang
Journal of Separation Science 2015 Volume 38( Issue 19) pp:3477-3486
Publication Date(Web):
DOI:10.1002/jssc.201500594
A novel bovine serum albumin (BSA) surface imprinted polymer based on ZnO rods was synthesized by surface grafting copolymerization. It exhibited an excellent recognition performance to bovine serum albumin. The adsorption capacity and imprinting factor of bovine serum albumin could reach 89.27 mg/g and 2.35, respectively. Furthermore, the fluorescence property of ZnO was used for tracing the process of protein imprinting and it implied the excellent optical sensing property of this material. More importantly, the hypothesis that the surface charge of carrier could affect the imprinting process was confirmed. That is, ZnO with positive surface charge could not only improve the recognition specificity of binding sites to template proteins (pI < 7), but also deteriorate the bindings between sites and non-template proteins (pI > 7). It was also important that the reusability of ZnO@BSA molecularly imprinted polymers was satisfactory. This implied that the poor mechanical/chemical stability of traditional zinc oxide sensors could be solved by the introduction of surface grafting copolymerization. These results revealed that the ZnO@BSA molecularly imprinted polymers are a promising optical/electrochemical sensor element.
Co-reporter:Wei Li, Xiangkun Jia, Baoliang Zhang, Lei Tian, Xiangjie Li, Hepeng Zhang and Qiuyu Zhang
New Journal of Chemistry 2015 vol. 39(Issue 4) pp:2925-2934
Publication Date(Web):02 Feb 2015
DOI:10.1039/C4NJ02117G
Novel magnetic Fe3O4/SiO2/P(GMA-co-EGDMA) composite nanoparticles grafted with hyperbranched/linear polyethylenimine ligands were fabricated. Subsequently, nano palladium was effectively anchored on this carrier through complexation between Pd2+ ions and multifunctional organic ligands, then a novel supported Pd nanoparticle catalyst with good dispersion and high loading of Pd nanoparticles was successfully prepared after the following reduction process. Afterwards, the as-prepared supported Pd nanoparticle catalyst was characterized by SEM, TEM, XRD, FTIR, TG and ICP-AES. Ultimately, the catalytic performance of the supported Pd nanoparticle catalyst was investigated by catalysing the Sonogashira cross-coupling reaction between aryl halides and arylacetylene. Research shows that the novel supported Pd nanoparticle catalyst exhibits very superior catalytic activity in catalysing the Sonogashira cross-coupling reaction between aryl halides and arylacetylene, even in the absence of the cocatalyst (CuI), and the side reaction producing the by-product (1,3-diyne) can be inhibited effectively. In addition, this supported Pd nanoparticle catalyst exhibits stable recovery and high catalytic activity, for it can be effectively reused 8 times without obvious loss of catalytic activity. Furthermore, the yields of the target products of the Sonogashira cross-coupling reaction between iodobenzene and phenylacetylene, 3-aminophenylacetylene and 4-(ethynyl)phthalic anhydride can reach approximately 79%, 78% and 95% after this novel supported Pd nanoparticle catalyst has been used eight times, respectively.
Co-reporter:Wei Li, Yi Tian, Baoliang Zhang, Lei Tian, Xiangjie Li, Hepeng Zhang, Nisar Ali and Qiuyu Zhang
New Journal of Chemistry 2015 vol. 39(Issue 4) pp:2767-2777
Publication Date(Web):21 Jan 2015
DOI:10.1039/C4NJ02407A
In this paper, magnetic Fe3O4@SiO2@mSiO2 microspheres with core–shell structure were chosen as a catalyst support, then hyperbranched polyglycerol (HPG) was successfully grafted onto the exterior surface and mesopore wall of this material under the catalysis of isopropanol aluminum. Subsequently, the terminal hydroxyl groups of HPG were successfully transformed into carboxyl groups after modification with succinic anhydride. Ultimately, palladium nanoparticles (Pd NPs) were successfully anchored onto the surface of the aforementioned magnetic Fe3O4@SiO2@mSiO2 microspheres with high density carboxylic HPG, nanocrystallization by the complexation between Pd2+ ions and carboxyl groups and the subsequent reduction, a novel Fe3O4@SiO2@mSiO2-HPG-COOH-Pd(0) supported catalyst was successfully obtained. This novel supported Pd NP catalyst is very conducive to the transference and exchange of each component in the reaction system for the orderly mesoporous opening structure. Furthermore, the introduction of a magnetism nucleus can provide convenient magnetic separation. More importantly, the numerous terminal carboxyl groups on the surface of the magnetic Fe3O4@SiO2@mSiO2 microspheres can provide plenty of sufficient binding sites for Pd NPs, and the unique hyperbranched structure is very conducive to capture uniformly dispersed nanosized palladium and can effectively enhance the catalytic activity and stability. Research indicates that this novel supported Pd NP catalyst not only possesses extremely high Pd NPs loading capacity but also shows remarkable catalytic activity to the Suzuki cross-coupling reaction between aryl halides and phenylboronic acid. Simultaneously, the catalytic activity of this supported catalyst did not show evident loss after being used at least eight times.
Co-reporter:Lei Tian, Xiangjie Li, Panpan Zhao, Xin Chen, Zafar Ali, Nisar Ali, Baoliang Zhang, Hepeng Zhang, and Qiuyu Zhang
Macromolecules 2015 Volume 48(Issue 20) pp:7592-7603
Publication Date(Web):October 12, 2015
DOI:10.1021/acs.macromol.5b01319
A unique phenomenon—a single hole appeared gradually on the surface of the seed particles and grew with the proceeding of swelling—has been observed during swelling poly(glycidyl methacrylate) (PGMA) particles. PGMA particles suffer the function of the swelling agent and styrene monomer and form a single hole on their surface. SEM and TEM were utilized to observe and demonstrate the forming process. Inconceivably, monodisperse poly(glycidyl methacrylate)/polystyrene (PGMA/PS) anisotropic microparticles, including Janus, raspberry-shaped, acorn-shaped, and hollow with open mouth, have been fabricated by the seed polymerization of these single-hole microparticles as a generalized approach. The morphology evolution of PGMA/PS is investigated by regulating the amount of monomer and monomer/seed weight ratio. Moreover, the surface of PGMA/PS microparticles are rich in epoxy groups, which has bright prospects in application in biomacromolecule immobilization and superhydrophilic/superhydrophobic coating.
Co-reporter:Mingliang Ma;Yong Ma;Baoliang Zhang;Hepeng Zhang
Journal of Materials Science 2015 Volume 50( Issue 8) pp:3083-3090
Publication Date(Web):2015 April
DOI:10.1007/s10853-015-8868-5
One-dimensional (1D) Fe3O4/poly(N-isopropylacrylamide-methacrylic acid-N,N′ -methylenebisacrylamide)(Fe3O4/P(NIPAM–MAA–MBA)) peapod-like nanochains have been successfully synthesized by magnetic field-induced precipitation polymerization. Fe3O4 microspheres modified with vinyl groups can be arranged with the direction of the external magnetic field in a line and linked permanently via P(NIPAM–MAA–MBA) coating during precipitation polymerization. The properties of 1D Fe3O4/P(NIPAM–MAA–MBA) were characterized by transmission electron microscopy, X-ray diffraction, thermogravimetric analysis (TGA), vibrating sample magnetometry, X-ray photoelectron spectroscopy, and UV–Vis spectrophotometer. Magnetic measurement revealed that these 1D peapod-like nanochains showed highly magnetic sensitivity. The thermal- and pH- response of 1D magnetic Fe3O4/P(NIPAM–MAA–MBA) nanochains was investigated by the temperature/pH dependence of hydrodynamic radius of Fe3O4/P(NIPAM–MAA–MBA) microspheres. The release behavior of phenolphthalein from 1D magnetic Fe3O4/P(NIPAM–MAA–MBA) nanochains could be effectively controlled by changing the temperature/pH values.
Co-reporter:Nisar Ali;Zhang Baoliang;Hepeng Zhang;Wajed Zaman
Journal of Polymer Research 2015 Volume 22( Issue 11) pp:
Publication Date(Web):2015 November
DOI:10.1007/s10965-015-0837-9
In this paper, iron oxide poly(methylmethacrylate-acrylicacid-divinylbenzene) Fe3O4@P(MMA-AA-DVB) magnetic core shell microspheres with chemical bonds between the inorganic core and the polymer shell in a narrow particle size were designed and synthesized. The surface morphology and magnetic properties of the magnetic Fe3O4@P(MMA-AA-DVB) nanoparticles formed were characterized using a laser particle size analyzer, transmission electron microscopy, Fourier transform infrared spectroscopy, vibrating sample magnetometry, and thermogravimetric analysis. Fourier transform infrared spectrometer analysis indicates the presence of carboxylic group -COOH and Fe3O4 in the final Fe3O4@P(MMA-AA-DVB) core shell microspheres. The Fe3O4@P(MMA-AA-DVB) core shell microspheres possessed a characteristic of paramagnetic with the saturation magnetization value of about 7 to 9 emu/g determined by vibrating sample magnetometer (VSM). The experimental results show that Fe3O4@P(MMA-AA-DVB) magnetic core shell microspheres exhibit model interfacially active and demulsification properties. The results showed that the microspheres exhibited excellent magnetic and demulsification properties and can be recycled to use again.
Co-reporter:Wei Li;Yi Tian;Chenhui Zhao;Baoliang Zhang
Journal of Nanoparticle Research 2015 Volume 17( Issue 12) pp:
Publication Date(Web):2015 December
DOI:10.1007/s11051-015-3291-z
In this paper, the core–shell SiO2@mSiO2/CTAB spheres were fabricated by choosing the solid silica spheres of different sizes as the internal cores, then a series of etching experiments were conducted. For different etching time and particle size, different rattle-type or hollow silica spheres were obtained. Investigation showed that CTAB in the mesoporous shell played a very important role to the selectivity of the etching. Both the rattle-type and hollow structures were successfully fabricated by adjusting the etching time in the presence of CTAB but without obvious etching of mesoporous silica shell. More importantly, the morphology transformation depended on the particle size of the solid silica cores. Generally, when the particle size of the internal cores was very small (d < 170 nm), the hollow structure was first obtained even after being etched for a short time. When the particle size of the internal cores was slightly larger (200 nm < d < 500 nm), the rattle-type microspheres with double-shell structure were first obtained after being etched for a short time, then the hollow structure was obtained with prolonging etching time. But when the particle size of the internal cores was far larger (d > 1 μm), the rattle-type microspheres with at least double-shell structure were first obtained after a certain period of etching time, then the hollow spheres with multi-shell structure were obtained with prolonging etching time. It is further revealed that both the rattle-type and hollow silica spheres with multi-shell structure could be prepared successfully if the particle size of the solid silica core was large enough.
Co-reporter:Wei Li;Peitao Li;Yin Liu;Baoliang Zhang;Hepeng Zhang;Wangchang Geng
ChemCatChem 2015 Volume 7( Issue 24) pp:4163-4172
Publication Date(Web):
DOI:10.1002/cctc.201500845
Abstract
A novel visible-light driven BiOBr/β-Co(OH)2/PVP (PVP=polyvinylpyrrolidone) hierarchical multicomponent photocatalyst assembled in nanosheets was synthesized by a simple one-pot solvothermal synthesis. The as-prepared photocatalyst was characterized by field-emitting scanning electron microscopy, transmission electron microscopy, N2 adsorption–desorption analysis, FTIR spectroscopy, energy-dispersive X-ray spectroscopy, X-ray powder diffraction analysis, X-ray photoelectron spectroscopy, UV/Vis diffuse reflectance spectra, and inductively coupled plasma atomic emission spectrometry. This research shows that the formation of the p–n heterojunction would be very conducive to effectively inhibit the recombination of the photoexcited electron–hole pairs and enhance the photoactivity significantly. Owing to its narrow band-gap energy (≈2.49 eV) and fast interfacial charge migration, this novel photocatalyst can efficiently absorb visible light and shows an improved ability for utilizing light energy. Although both β-Co(OH)2 and BiOBr alone exhibit little photoactivity for the degradation of dyes, the BiOBr/β-Co(OH)2/PVP hierarchical multicomponent photocatalyst exhibits unexpected, surprisingly high photoactivity and stability in degrading dyes in aqueous solution at moderate Co/Bi molar ratio and moderate PVP addition. The catalyst′s photoactivity is approximately 9.7 times of that of β-Co(OH)2 and 3.2 times of that of BiOBr. This unusual photoactivity mainly arises from the synergetic chemical coupling effects between BiOBr, β-Co(OH)2, and PVP. The excellent photoactivity and photostability of this hierarchical multicomponent photocatalyst make it a promising photocatalyst under visible-light response. Beyond that, this novel photocatalyst can be reused many times without significant loss of its activity.
Co-reporter:Linxia Fang, Baoliang Zhang, Wei Li, Jizhong Zhang, Kejing Huang, Qiuyu Zhang
Electrochimica Acta 2014 Volume 148() pp:164-169
Publication Date(Web):1 December 2014
DOI:10.1016/j.electacta.2014.10.065
We report a facile strategy to synthesize ZnO-graphene nanocomposites as an advanced electrode material for high-performance supercapacitors. The ZnO-graphene nanocomposites have been fabricated via a facile, low-temperature in situ wet chemistry process. During this process, high dispersed ZnO nanoparticles are embedded in graphene nanosheets, leading to sandwich-structured ZnO-graphene nanocomposites. Thus, intimate interfacial contact between ZnO nanoparticles and graphene nanosheets are achieved, which facilitates electrochemical activity and enhance electrochemical properties due to fast electron transfer. The as-prepared ZnO-graphene nanocomposites exhibit a maximum specific capacitance of 786 F g−1 and excellent cycle life with capacity retention of about 92% after 500 cycles. This facile design and rational synthesis offers an effective strategy to enhance the electrochemical performance of supercapacitors and shows promising potential for large-scale application in energy storage.
Co-reporter:Tiejun Xin, Mingliang Ma, Hepeng Zhang, Junwei Gu, Shuangjie Wang, Mengjiao Liu, Qiuyu Zhang
Applied Surface Science 2014 Volume 288() pp:51-59
Publication Date(Web):1 January 2014
DOI:10.1016/j.apsusc.2013.09.108
Highlights
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Fe3O4@TiO2 core–shell structured nanocomposites have been successfully synthesized by mixed-solvent with solvothermal method.
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The morphology of Fe3O4@TiO2 nanochains can be controlled by the amount of ammonia.
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The thickness of shell can be tuned by the amount of TBOT.
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These Fe3O4@TiO2 nanocomposites exhibited high degree of crystallinity and excellent magnetic properties at room temperature.
Co-reporter:Linxia Fang, Kejing Huang, Baoling Zhang, Bing Liu, Yujie Liu and Qiuyu Zhang
RSC Advances 2014 vol. 4(Issue 90) pp:48986-48993
Publication Date(Web):05 Sep 2014
DOI:10.1039/C4RA06090C
A biocompatible Au–ZnO nanocomposite was used to fabricate a sensitive sensor for the detection of dopamine (DA). High-density Au nanoparticles (AuNPs) were homogeneously loaded onto a nanosheet-based three-dimensionally (3D) hierarchical ZnO matrix. The high specific surface area of the nanosheet-based three-dimensionally (3D) hierarchical ZnO favored the high density loading of AuNPs, which helped efficiently catalyze the oxidation of DA. The Au–ZnO nanocomposite was characterized by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and electrochemical impedance spectroscopy (EIS). The electrocatalytic activity toward the oxidation of dopamine was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The sensors exhibited sensitive responses to DA with a linear range of 0.1–300 μM and a detection limit of 0.02 μM based on S/N = 3. The good analytical performance and long-term stability of the proposed sensor can be attributed to the synergistic effect of the nanosheet-based ZnO structure and gold nanoparticles on the electrochemical oxidation of dopamine.
Co-reporter:Linxia Fang, Kejing Huang, Baoling Zhang, Yujie Liu and Qiuyu Zhang
New Journal of Chemistry 2014 vol. 38(Issue 12) pp:5918-5924
Publication Date(Web):02 Sep 2014
DOI:10.1039/C4NJ01218F
A novel label-free DNA hybridization biosensor was fabricated using flower-like 3-dimensional (3D) ZnO superstructures as an enhanced sensing platform and employing chitosan (CS) as a film-forming material. A highly sensitive electrochemical DNA sensor was constructed by homogenously distributing Au nanoparticles (AuNPs) on the ZnO–CS matrix. The electrochemical performance of the designed electrodes was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Differential pulse voltammetry (DPV) was used to monitor DNA hybridization. The AuNPs/ZnO–CS film exhibited good conductivity for accelerating the electron transfer, which led to obvious signal amplification and a low detection limit for electrochemical sensing. Under optimal conditions, the peak currents of the redox marker exhibited a linear relationship with the logarithm of the concentrations of complementary DNA from 1.0 × 10−14 to 1.0 × 10−10 M with a detection limit of 2.0 × 10−15 M (3σ/S). The developed sensor also displayed high selectivity to differentiate one-base mismatched DNA. The excellent performance of the biosensors was attributed to large surface-to-volume of ZnO superstructures and the synergistic effect of AuNPs and CS. The proposed approach provides a simple and reliable method for DNA detection and will open new opportunities for the sensitive detection of other nucleic acids.
Co-reporter:Junwei Gu;Ting Bai;Jing Dang;Junjun Feng
Polymer Composites 2014 Volume 35( Issue 3) pp:611-616
Publication Date(Web):
DOI:10.1002/pc.22702
A novel “three-step approach” of methanesulfonic acid/γ-aminopropyl triethoxy silane/GlycidylEthyl polyhedral oligomeric silsesquioxane (MSA/KH550/POSS) was proposed to functionalize the surface of high modulus poly (p-phenylene-2,6-benzobisoxazole) (HMPBO) fibers. Results indicated that GlycidylEthyl POSS was successfully grafted on the surface of HMPBO fibers and the surface roughness of HMPBO fibers was increased obviously. The single fiber pull-out strength of POSS-g-HMPBO/epoxy resin microcomposite was improved to 1.19 MPa, better than that of native HMPBO/epoxy resin microcomposite. POLYM. COMPOS., 35:611–616, 2014. © 2013 Society of Plastics Engineers
Co-reporter:Linxia Fang, Baoliang Zhang, Wei Li, Xiangjie Li, Tinjun Xin, Qiuyu Zhang
Superlattices and Microstructures 2014 Volume 75() pp:324-333
Publication Date(Web):November 2014
DOI:10.1016/j.spmi.2014.03.001
•Three ZnO hierarchical architectures were synthesized through a facile solution route, employing trisodium citrate as structure-directing agent.•The influence of the citrate concentration on ZnO microstructure was studied.•The possible formation mechanisms of three ZnO hierarchical architectures were proposed.•The photocatalytic properties of the samples were evaluated by photodegradation reaction of methylene blue under UV irradiation.A facile solution route to synthesize ZnO hierarchical architectures was carried out employing trisodium citrate as structure-directing agent. Three different morphologies and crystal phase samples, including double-layer hexagonal prism ascribed to wurtzite ZnO (JCPDS No. 36-1451), porous microspheres ascribed to an unusual ZnO phase (JCPDS No. 21-1486) and smooth solid amorphous zinc citrate microsphere, were obtained. FESEM, TEM, XRD and FT-IR spectroscope were used to investigate the structure character of the products. The influence of the citrate concentration on ZnO microstructure was studied. It was found that the citrate concentration played a key role in evolution of the morphology and crystal phase. On the basis of experimental results, a possible formation mechanism of the ZnO hierarchical nanostructures was proposed. Photocatalytic property of the samples was evaluated by photodegradation reaction of methylene blue (MB) under UV irradiation. Among these products, double-layer hexagonal prism samples exhibited the highest photocatalytic activity.
Co-reporter:Nisar Ali, Baoliang Zhang, Hepeng Zhang, Wajed Zaman, Wei Li, Qiuyu Zhang
Particuology 2014 Volume 17() pp:59-65
Publication Date(Web):December 2014
DOI:10.1016/j.partic.2014.02.001
•P(MMA-AA-DVB)/Fe3O4 magnetic Janus nanoparticles were synthesized using a solvothermal process.•Fe3O4 grew preferentially on one side of the polymeric precursor nanoparticle surface.•Particle size was controlled to be 200 nm by adjusting amount of cross-linker in polymerization.•Janus nanoparticles were superparamagnetic with a saturation magnetization of less than 25 emu/g.Inorganic/organic poly(methylmethacrylate-acrylic acid-divinylbenzene) iron oxide Janus magnetic nanoparticles (P(MMA-AA-DVB)/Fe3O4) with strong magnetic domains and unique surface functionalities were prepared using a solvothermal process. The P(MMA-AA-DVB) nanoparticles were prepared via soap-free emulsion polymerization and used as a precursor for preparing Janus nanoparticles. The morphology and magnetic properties of the magnetic Janus nanoparticles formed were characterized using a laser particle size analyzer, transmission electron microscopy, Fourier transform infrared spectroscopy, vibrating sample magnetometry, and thermogravimetric analysis. The synthesized P(MMA-AA-DVB)/Fe3O4 magnetic Janus nanoparticles were characterized by a Janus structure and possessed a stable asymmetric morphology after being dually functionalized. The particle size, magnetic content, and magnetic domain of the P(MMA-AA-DVB)/Fe3O4 magnetic Janus nanoparticles were 200 nm, 40%, and 25 emu/g, respectively. The formation mechanism of the Janus nanoparticles was also investigated, and the results revealed that the reduction of Fe3+ ions and growth of Fe3O4 took place on the surface of the P(MMA-AA-DVB) polymeric precursor particles. The size of the Janus particles could be controlled by narrowing the size distribution of the P(MMA-AA-DVB) precursor nanoparticles.
Co-reporter:Xiangjie Li, Baoliang Zhang, Wei Li, Xingfeng Lei, Xinlong Fan, Lei Tian, Hepeng Zhang, Qiuyu Zhang
Biosensors and Bioelectronics 2014 Volume 51() pp:261-267
Publication Date(Web):15 January 2014
DOI:10.1016/j.bios.2013.07.008
•Bovine serum albumin surface-imprinted thermosensitive magnetic polymer microspheres Fe3O4@SiO2@BSA-MIP(NIP) were prepared.•The adsorption of template molecule could be regulated by system temperature.•The adsorption capacity, imprinting factor and reusability of Fe3O4@SiO2@BSA-MIP were satisfactory.A novel bovine serum albumin surface-imprinted thermosensitive magnetic composite microsphere was successfully prepared by the surface grafting copolymerization method in the presence of temperature-sensitive monomer N-isopropylacrylamide (NIPAM), functional monomer methacrylic acid (MAA) and cross-linking agent N,N′-methylenebisacrylamide (MBA). The structure and component of the thermosensitive magnetic molecularly imprinted microsphere were investigated by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), vibrating sample magnetometer (VSM) and thermogravimetric analysis (TGA). The results of thermosensitivity, adsorption capacity, selectivity and reusability showed the formation of a thermosensitivity grafting polymer layer P(NIPAM–MAA–MBA) on the surface of Fe3O4@SiO2 and the good adsorption capacity and specific recognition for template protein. When the adsorption temperature was higher than the lower critical solution temperature (LCST) of poly(N-isopropylacrylamide) (PNIPAM), shape memory effect of imprinted cavities would be more effective. In other words, it was more conducive to capture template molecules under this condition and the imprinting factor would be higher. On the other hand, when the desorption temperature was lower than LCST of PNIPAM, the decrease of shape memory effect between imprinted cavities and template molecules would facilitate the release of template molecules from the imprinted cavities. Based on this property, the adsorption and desorption of template molecules could be regulated by system temperature indirectly which benefited from the existence of thermosensitivity imprinting layer.
Co-reporter:Xiangjie Li, Baoliang Zhang, Lei Tian, Wei Li, Tiejun Xin, Hepeng Zhang, Qiuyu Zhang
Sensors and Actuators B: Chemical 2014 196() pp: 265-271
Publication Date(Web):
DOI:10.1016/j.snb.2014.01.109
Co-reporter:Xing F. Lei, Ying Chen, He P. Zhang, Xiang J. Li, Pan Yao, and Qiu Y. Zhang
ACS Applied Materials & Interfaces 2013 Volume 5(Issue 20) pp:10207
Publication Date(Web):September 16, 2013
DOI:10.1021/am402957s
A novel space survivable polyimide with a variety of desirable properties such as excellent thermal stability, high optical transparency, good mechanical strength, satisfactory break elongation, and outstanding atomic oxygen (AO) erosion resistance has been prepared by first synthesizing hyperbranched polysiloxane (HBPSi) and second incorporating HBPSi into polyimide (PI) chains via copolycondensation reactions. The 29Si nuclear magnetic resonance (29Si NMR) spectrum of HBPSi indicated that HBPSi possessed hyperbranched topology. The ground-based simulated AO exposure experiments demonstrated the mass loss of HBPSi polyimides decreased with increasing HBPSi addition and AO fluence, and it reached as low as 7.7% that of pristine polyimide when HBPSi addition was 29.7 wt % after 22 h AO exposure. Surface morphologies confirmed that pristine polyimide was significantly roughened after AO exposure while HBPSi polyimide had even less rough surface topography. During exposure of HBPSi polyimide to AO, the organic polyimide of the surface was first degraded and a silica protective layer eventually formed, which enabled the surface to be “self-healing”. It is this passivation layer that prevents the underlying polymer from additional erosion. The whole preparation process of HBPSi polyimide is moderate, low-cost, environmentally friendly, and suitable for industrialized mass production, which contributes this novel material to a “drop-in” replacement for the widely used Kapton on spacecrafts functioning in space environment.Keywords: atomic oxygen (AO); hyperbranched; low earth orbit (LEO); polyimide; polysiloxane;
Co-reporter:Chunmei Li;Xinlong Fan;Lunwei Zhou;Baoliang Zhang
Journal of Polymer Research 2013 Volume 20( Issue 6) pp:
Publication Date(Web):2013/06/01
DOI:10.1007/s10965-013-0153-1
Monodisperse microspheres with average particle size in the range of 100–600 nm, whose main monomer was styrene, were prepared by soap-free emulsion polymerization. The factors influencing polymer colloidal particle sizes and size distributions were investigated, including initiator concentration, polymerization temperature and hydrophilic monomer amount. Then, six kinds of polymer microspheres with average size from 153 nm to 565 nm were selected to grow colloid photonic crystal by vertical deposition method. Results showed that photonic band gaps could be effectively adjusted by changing the particle size. The obtained photonic crystals were highly ordered face-centered cubic structures. Furthermore, vertical deposition was only suitable for particles with average size less than 300 nm.
Co-reporter:Jiuli Sun;Feige Guo;Junwei Gu ;Junping Zhang
Journal of Applied Polymer Science 2012 Volume 125( Issue 1) pp:725-730
Publication Date(Web):
DOI:10.1002/app.35412
Abstract
Magnetic polyimide hybrid thin films were synthesized from pyromellitic dianhydride (PMDA), 4,4′-oxydianiline (ODA), and Fe3O4 magnetic nanoparticles via thermal imidiazation in nitrogen environments. The magnetic polyimide hybrid thin films were analyzed and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The magnetic properties of magnetic nanoparticles and polymer hybrid thin films were assessed using a vibrating sample magnetometer (VSM), and the physical properties of hybrid thin films were tested. Results revealed that the magnetic polyimide hybrid thin films had superparamagnetic behavior and excellent mechanical properties. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Co-reporter:Wangchang Geng, Qing Yuan, Xingmao Jiang, Jinchun Tu, Libing Duan, Junwei Gu, Qiuyu Zhang
Sensors and Actuators B: Chemical 2012 174() pp: 513-520
Publication Date(Web):
DOI:10.1016/j.snb.2012.08.057
Co-reporter:Baoliang Zhang;Hepeng Zhang;Xingfeng Lei
Journal of Polymer Research 2012 Volume 19( Issue 10) pp:
Publication Date(Web):2012 October
DOI:10.1007/s10965-012-9986-2
The synthesis of polyhedral oligomeric silsesquioxane (POSS) via hydrolytic co-condensation of phenyltriethoxysilane (PTES) and γ-aminopropyltrieth-oxysilane (APS) was presented in this paper. The microspheres with mean diameter of 1.83 μm were precipitated from solvent phase through self-assembly when solvent phase was changed. After the reduction of hydrazine hydrate, POSS/Ag hybrid microspheres were obtained based on the chelation of external amino-groups to silver ions. The hybrid microspheres modified epoxy resin was also studied in the work. The structure and particle size distribution of POSS, feature and silver content of the POSS/Ag core/shell microspheres, heat resistance, thermal conductivity and comprehensive mechanical properties of the epoxy resin modified by diamine-POSS/Ag were characterized by NMR, FTIR, SEM, Laser Particle Sizer, TGA and Flat Heat Conduction Coefficient, Universal Testing Machine. It was found that POSS was cage-like structures with two amino-groups, amino group content was 2.12 mmol/g and the silver conten was 47.96 %, respectively. When Ag addition reached 5 %, thermal conductivity of the modified epoxy resin has increased fourfold four times greater than pure, and the heat resistance increased by 35 °C. Moreover, the bending strength and impact strength of the modified resin were 127 MPa and 11.94 KJ/m2, respectively, compared with pure epoxy resin, both of which have improved.
Co-reporter:Mingliang Ma;Jinbo Dou;Hepeng Zhang
Colloid and Polymer Science 2012 Volume 290( Issue 12) pp:1207-1213
Publication Date(Web):2012 August
DOI:10.1007/s00396-012-2696-9
One-dimensional (ID) magnetic thermosensitive Fe3O4/poly(N-isopropylacrylamide–N,N′-methylenebisacrylamide) (P(NIPAM-MBA)) peapod-like nanochains have been successfully synthesized by magnetic-field-induced precipitation polymerization using Fe3O4 as building blocks and P(NIPAM-MBA) as linker. Fe3O4 microspheres can be arranged with the direction of an external magnetic field in a line via the dipolar interaction between Fe3O4 microspheres and linked permanently via P(NIPAM-MBA) coating during precipitation polymerization. 1D magnetic Fe3O4/P(NIPAM-MBA) peapod-like nanochains can be oriented and aligned along the direction of the external magnetic field. More interestingly, Fe3O4 microspheres in each peapod were regularly arranged in a line and periodically separated through the P(NIPAM-MBA) layers with a visible interparticle spacing.
Co-reporter:Shaojie Chen, Qiuyu Zhang, Qing Liu, Junwei Gu, Li Zhang, Jian Zhou, Xinlong Fan, Li Fang
Reactive and Functional Polymers 2011 71(10) pp: 1008-1015
Publication Date(Web):October 2011
DOI:10.1016/j.reactfunctpolym.2011.07.003
Co-reporter:Ding Zhong Yuan, Qiu Yu Zhang, Jin Bo Dou
Chinese Chemical Letters 2010 Volume 21(Issue 9) pp:1062-1066
Publication Date(Web):September 2010
DOI:10.1016/j.cclet.2010.04.025
Macroporous magnetic poly(GMA-EGDMA-DVB) microspheres synthesized by suspension polymerization were used as supports for palladium catalyst. The results showed the novel magnetic catalyst can promote Heck reaction of aryl halides with acrylic acid efficiently without an inert atmosphere. In addition, the novel catalyst can be conveniently recovered by applying an external magnet and reused at least five times without significant loss of its activity.
Co-reporter:Jinbo Dou;Liang Jian;Junwei Gu
Colloid and Polymer Science 2010 Volume 288( Issue 18) pp:1751-1756
Publication Date(Web):2010 December
DOI:10.1007/s00396-010-2310-y
This study describes the use of photo-initiated miniemulsion polymerization of methyl methacrylate and the incorporation of magnetic nanoparticles. With photo-initiator in the oil-in-water miniemulsion, UV irradiation led to the formation of polymer latexes after 15 min with the reaction temperature lower than 45 °C. Moreover, this method can be applied for the incorporation of magnetic nanoparticles. The particle sizes were measured by laser particle analyzer which showed narrow distributions. The morphology of the particles was examined with a transmission electron microscope and scanning electron microscope. The incorporation of magnetic nanoparticles was characterized with X-ray diffraction and vibrating sample magnetometer, both of which demonstrated that magnetic nanoparticles had been successfully incorporated into the polymer matrix.
Co-reporter:Shaojie Chen, Qiuyu Zhang, Junping Zhang, Junwei Gu, Li Zhang
Sensors and Actuators B: Chemical 2010 Volume 149(Issue 1) pp:155-160
Publication Date(Web):6 August 2010
DOI:10.1016/j.snb.2010.06.007
Two conjugated polymers were synthesized via the Heck reaction and the Sonogashira reaction, respectively. The resulting polymers were characterized by infrared spectroscopy (IR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), gel permeation chromatography (GPC), UV-absorption and fluorescence spectroscopy. Both of the polymers were examined for chemosensor applications to detect the explosive compound TNT. Both of the polymer solutions and the thin films showed high fluorescence quenching sensitivity towards TNT, indicating that they are potentially useful chemosensor materials for detecting explosives.
Co-reporter:Li Zhang, QiuYu Zhang, Hongling Yan, JuPing Zhang, JunWei Gu, HePeng Zhang, FeiGe Guo
Synthetic Metals 2009 Volume 159(19–20) pp:2038-2042
Publication Date(Web):October 2009
DOI:10.1016/j.synthmet.2009.07.020
π-Conjugated polymers consisting of donor–acceptor repeating units often show a low band gap and hence have a good adsorbing efficiency of solar energy. Based on this fact, two novel π-conjugated polymers, PPE-1 and PPE-2, composed of electron-donating phenyl rings and electron-accepting quinoxaline units were prepared via Sonogashira polycondensation. The copolymers were characterised by NMR, FT-IR, GPC, TGA, UV and PL. These copolymers are thermostable and film forming. The PPE-1 and PPE-2 exhibited a decreased optical band gap (2.39 eV and 2.30 eV, respectively) compared to PPE homopolymer. And they showed red-shifted UV–vis absorption peak comparison with that of pure PPE. The absorption peak and PL emission peak of polymers are both red-shifted in solid state compared to polymers in solution due to strong inter-chain π–π interactions. Furthermore, the PL emission intensity of these copolymers is almost completely quenched when copolymers were blended with C60. The HOMO of two polymers estimated from CV is clearly lower in energy than MEH-PPV. This indicates that PPE-1 and PPE-2 are more oxidatively stable than MEH-PPV. The result shows that both PPE-1 and PPE-2 are useful for polymer solar cells.
Co-reporter:Feige Guo, Qiuyu Zhang, Baoliang Zhang, Hepeng Zhang, Li zhang
Polymer 2009 50(8) pp: 1887-1894
Publication Date(Web):
DOI:10.1016/j.polymer.2009.02.023
Co-reporter:Qiuyu Zhang;Gang Xie;Junping Zhang;Min He;Hepeng Zhang
Journal of Applied Polymer Science 2007 Volume 105(Issue 6) pp:3525-3530
Publication Date(Web):31 MAY 2007
DOI:10.1002/app.26394
Effects of some parameters on the polymerization of Styrene (St) during encapsulation of iron oxide particles via miniemulsion polymerization have been investigated. At the early stage of reaction, polymerization rate increased slightly with the increase of sonicating time, and then it leveled off. The polymerization rate increased with the increase of KPS at the early stage of polymerization, which tendency is analogous to the result of polymerization of St in miniemulsion without the presence of iron oxide particles. The increase of iron oxide not only decreased the polymerization rate but also resulted in poorer monodisperse of the particles when keeping the amount of dispersant constant. The dispersant played an important role in the encapsulation of magnetic particles via miniemulsion polymerization of St. It not only made the iron oxide disperse well in monomer droplets but also led to a much faster polymerization than that of no dispersant in system. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007
Co-reporter:Gang Xie;Zhengping Luo;Min Wu;Tiehu Li
Journal of Applied Polymer Science 2003 Volume 87(Issue 11) pp:1733-1738
Publication Date(Web):2 JAN 2003
DOI:10.1002/app.11483
Magnetic poly(styrene butyl acrylate methacrylic acid) [P(St–BA–MAA)] microspheres were prepared by emulsifier-free emulsion polymerization in the presence of a polar solvent and a ferrofluid prepared by a coprecipitation method. The effects of some polymerization parameters, such as the medium polarity, reaction temperature, initiator content, and surfactant content in the ferrofluid, on the particle diameter and particle size distribution of magnetic P(St–BA–MAA) microspheres were examined in detail. The results showed that the electrostatic repulsion in the polymerization system significantly affected the monodispersity of the resulting magnetic polymer microspheres. The proper electrostatic repulsion, achieved through changes in the medium polarity and amount of surfactant in the polymerization system, improved the monodispersity, but a higher or lower repulsion led to a decrease in the monodispersity. Although the existence of surfactant and magnetite particles reduced the monodispersity more or less, the polymerization behavior of an emulsifier-free emulsion polymerization in the presence of the ferrofluid was analogous to that of a conventional emulsifier-free emulsion polymerization. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1733–1738, 2003
Co-reporter:Zafar Ali, Lei Tian, Panpan Zhao, Baoliang Zhang, Nisar Ali, Muhammad Khan, Qiuyu Zhang
Journal of Molecular Catalysis B: Enzymatic (December 2016) Volume 134(Part A) pp:129-135
Publication Date(Web):1 December 2016
DOI:10.1016/j.molcatb.2016.10.011
•Synthesis of KCC-1.•Formation of Si@NH2@CHO.•ImmobilizationoflipaseonSi@NH2@CHO.Lipase from Candida Ragusa (CRL) was successfully covalently immobilized on fibrous silica nanoparticles KCC-1, and the properties of immobilized enzyme were investigated. Mesoporous fibrous silica nanoparticles (MSNPs) were synthesized with particles size 200 nm pore size 15–30 nm; followed by amino-functionalization. Scanning Electron Microscopy (SEM), Transmittance Electronic microscopy (TEM), Fourier Transform Infrared Spectroscopy (FT-IR) and N2 adsorption were used for the characterization of nanoparticles. Further SiO2@NH2 nanoparticles were activated by glutaraldehyde as a bifunctional cross linker, and were used for lipase immobilization. The applied approach for support preparation, activation, and optimization of immobilization conditions, led to better resistance to temperature and pH inactivation in comparison to the free lipase, and hence widened the reaction pH and temperature regions, with the optimum pH and temperature of 7.5 and 40 °C, respectively. The immobilized Lipase Candida Ragusa (ICRL) maintained above 81% of the initial activity after 28 days and 80% activity after 8 repeated cycles. Thus ICRL showed improved storage stability reusability and 700 U/g of protein as immobilization efficiency.Download high-res image (110KB)Download full-size image
Co-reporter:Mingtao Qiao, Xingfeng Lei, Yong Ma, Lidong Tian, Wenbin Wang, Kehe Su, Qiuyu Zhang
Journal of Alloys and Compounds (5 February 2017) Volume 693() pp:432-439
Publication Date(Web):5 February 2017
DOI:10.1016/j.jallcom.2016.09.181
•Porous core-shell Fe3O4@MnO2 composite microspheres have been synthesized.•The BET specific surface area is 167 m2/g.•The pore width is mainly distributed in the range of 2.0–12.0 nm.•They possess the strongest RL peak of −42.6 dB (5.7 GHz) at loading 10 wt%.•The excellent absorbing bandwidth is located in the 10.2–15.0 and 15.5–17.3 GHz.Functional composite microspheres with porous Fe3O4 cores and hierarchical MnO2 shells have been synthesized successfully via a two-step hydrothermal method. X-ray diffraction was employed to determine the crystal forms of samples. The morphologies and microstructures of Fe3O4 nanoparticles and Fe3O4@MnO2 composite microspheres were observed by the scanning electron microscope and transmission electron microscope. It can be seen that hierarchically structured MnO2 shells have coated Fe3O4 nanoparticles, and the shell thickness is about 140–160 nm. The BET specific surface area and porosity were estimated by the N2 absorption-desorption isotherms and the magnetic properties were measured by the vibrating sample magnetometer. As-synthesized Fe3O4@MnO2 composite microspheres have a BET specific surface area of 167 m2/g, and the pore width is mainly distributed in the mesoporous range, especially from 2.0 nm to 12.0 nm. Investigations of microwave absorbing properties manifest that Fe3O4@MnO2 composite microspheres with loading 10% weight fraction possess the strongest RL peak of −42.6 dB (5.7 GHz) at the matching thickness 4.0 mm, and Fe3O4@MnO2 composite microspheres with loading 20% weight fraction have a broader absorbing bandwidth (10.2–15.0 GHz and 15.5–17.3 GHz) at the matching thickness 1.5 mm. Achieving the advantages of intensive absorption, wide effective absorbing bandwidth band and intrinsic lightweight feature, porous core-shell Fe3O4@MnO2 composite microspheres are believed to be more promising in the application of microwave absorption.
Co-reporter:Mingtao Qiao, Xingfeng Lei, Yong Ma, Lidong Tian, Wenbin Wang, Kehe Su, Qiuyu Zhang
Journal of Alloys and Compounds (5 February 2017) Volume 693() pp:432-439
Publication Date(Web):5 February 2017
DOI:10.1016/j.jallcom.2016.09.181
Co-reporter:Chenhui Zhao, Wei Li, Ying Liang, Yi Tian, Qiuyu Zhang
Applied Catalysis A: General (25 October 2016) Volume 527() pp:127-136
Publication Date(Web):25 October 2016
DOI:10.1016/j.apcata.2016.09.005
Co-reporter:Wei Li, Yi Tian, Huan Li, Chenhui Zhao, Baoliang Zhang, Hepeng Zhang, Wangchang Geng, Qiuyu Zhang
Applied Catalysis A: General (25 April 2016) Volume 516() pp:81-89
Publication Date(Web):25 April 2016
DOI:10.1016/j.apcata.2016.02.006
Co-reporter:Dingzhong Yuan, Qiuyu Zhang, Jinbo Dou
Catalysis Communications (10 March 2010) Volume 11(Issue 7) pp:606-610
Publication Date(Web):10 March 2010
DOI:10.1016/j.catcom.2010.01.005
A magnetically separable palladium catalyst has been easily synthesized by immobilizing palladium nanoparticles on the surface of superparamagnetic composite microspheres. It can promote Heck cross-coupling reactions efficiently without an inert atmosphere. The novel catalyst can be conveniently recovered by applying a permanent magnet externally and reused at least six times without significant loss of its catalytic activity.
Co-reporter:Xingfeng Lei, Yanhui Chen, Mingtao Qiao, Lidong Tian and Qiuyu Zhang
Journal of Materials Chemistry A 2016 - vol. 4(Issue 11) pp:NaN2146-2146
Publication Date(Web):2016/01/12
DOI:10.1039/C5TC03391H
Low-dielectric polyimide (PI) is on high demand in the next generation of high-density and high-speed integrated circuits. The introduction of fluorine or pores into PIs has been reported to efficiently obtain low-dielectric properties, but unavoidably deteriorate the mechanical and/or thermal properties. Therefore, it is a great challenge for PI to decrease its Dk and simultaneously maintain its mechanical and thermal properties. Herein, a series of robust PI films were fabricated by copolymerizing amine-functionalized hyperbranched polysiloxane (HBPSi) with pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA). The outstanding dielectric properties were achieved in a 35 wt% HBPSi PI film, which exhibits a Dk as low as 2.24 (1 MHz), mainly owing to the enhanced free volume and dielectric confinement effect afforded by the bulky HBPSi. Meanwhile, 35 wt% HBPSi PI demonstrates remarkable thermal stability and admirable mechanical properties, with the glass transition temperature of 388 °C, 5% weight loss temperature in argon flow up to 554 °C, a tensile strength of 80.6 MPa, elongation at break of 13.7% and a tensile modulus of 1.36 GPa. It also demonstrates conspicuous film homogeneity and planarity with the surface roughness as low as 0.42 nm and good moisture resistance with water uptake less than 1.5%. The prominent comprehensive properties make HBPSi PI a strong candidate for the future interlayer dielectrics.
Co-reporter:Yong Ma, Chunping Hou, Hao Zhang, Mingtao Qiao, Yanhui Chen, Hepeng Zhang, Qiuyu Zhang and Zhanhu Guo
Journal of Materials Chemistry A 2017 - vol. 5(Issue 27) pp:NaN14052-14052
Publication Date(Web):2017/06/01
DOI:10.1039/C7TA03279J
Although some polyaniline (PANI) morphologies have been reported, their synthesis with regular structures in multiple dimensions has met with limited success. Here, well-defined PANI spheres, roses, cloud-like and rhombic plates, layered flowers, columns, blocks, and dendrites were prepared by employing static surfactant systems in a 0.010 M HCl solution at room temperature. The acquisition of these multi-dimensional (MD) nanostructures was a result of the fact that aniline and the newly formed PANI molecules were subjected to a synergistic effect of soft templates and self-assembly processes. Detailed electrochemical measurements were performed to investigate the capacitance of these MD nanostructures. PANI layered flowers possessed the highest specific capacitance of 272 F g−1 at the current density of 1.0 A g−1 due to their morphologies. Additionally, two factors including the surfactant dosage and the pH value were evaluated to discern their impacts on the PANI morphologies. The method presented herein renders the possibility for fabricating regular MD PANI nanostructures. And these nanostructures also have potential to be applied in supercapacitor electrodes and energy storage.
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