Co-reporter:Xue Chen, Qidi Wang, Fengzhu Lv, Paul K. Chu and Yihe Zhang
RSC Advances 2016 vol. 6(Issue 14) pp:11211-11217
Publication Date(Web):14 Jan 2016
DOI:10.1039/C5RA25124A
A series of novel double-phosphate compounds RbCaGd(PO4)2:Eu2+ were first synthesized by the Pechini-type sol–gel method, and their structure and luminescence properties were characterized in detail. The compound RbCa0.97Gd(PO4)2:0.03Eu2+ crystallizes in the hexagonal system with space group P6222 and the parameters a = 7.006(49) Å, c = 6.358(80) Å, and V = 269.969 Å3, Z = 1. Its crystal structure is similar to that of hexagonal LnPO4, where the Rb atom occupies a large tunnel in the lattice and the Ln position is statistically occupied by both Gd and Ca (Eu) atoms. In addition, RbCaGd(PO4)2:Eu2+ produces an intense broadband emission from 400 to 600 nm with the CIE coordinates near (0.2089, 0.2674) and assembles a broad excitation spectrum from 250 to 425 nm. The concentration quenching, crystal field splitting, critical energy transfers distance and thermally stable luminescence properties of RbCaGd(PO4)2:Eu2+ phosphors are all discussed, which indicate that this material can be considered as a promising bluish green phosphor for application in white-light UV LEDs.
Co-reporter:Ling Ding, Yihe Zhang, Leipeng Liu, Jianshe Hu and Fengzhu Lv
RSC Advances 2016 vol. 6(Issue 62) pp:56812-56818
Publication Date(Web):06 Jun 2016
DOI:10.1039/C6RA10244A
Poly(amic acid) composite films with the thermotropic liquid crystal, 10-cholesteroxy-10-oxocaproic acid (COOA) were developed. The composites could still show liquid crystal behavior at low COOA loading (as low as 3 wt%) due to the phase separation under the induction of temperature. The synergistic reaction of the interaction of PAA with COOA and the arrangement of COOA endowed the films with strong fluorescence and a higher temperature shifted liquid crystal phase. Even more, the dielectric constant of the composites was enhanced. The composites were multifunctional optical-electric materials.
Co-reporter:Zilin Meng, Fengzhu Lv, Xiaowei Li, Qian Zhang, Paul K. Chu, Sridhar Komarneni, Yihe Zhang
Microporous and Mesoporous Materials 2016 Volume 227() pp:137-143
Publication Date(Web):June 2016
DOI:10.1016/j.micromeso.2016.02.046
•A recyclable process was developed for arsenate removal and alkali reduction.•Removal of alkali and As simultaneously from waste water by one-pot method.•Selective uptake of arsenate from other anions was related to bonding energies.•The removal and release processes of arsenate were accomplished by cycling.An effective and facile method was developed to remove As(V) and alkali simultaneously from alkaline wastewater based on the repeated in-situ formation of Zn–Al–AsO4 layered double hydroxide (ZnAl–AsO4 LDH). The removal efficiency of As(V) was almost 100% and the pH of the treated alkaline wastewater decreased from 12 to 7.47. Removal of As(V) was not affected by competitive anions such as SO42−, F−, Cl−, and NO3− due to the large binding energy between As(V) and LDH sheets as confirmed by calculations based on the Castep Module of Materials. About 96% of As(V) can be released and concentrated into a small volume of Na2CO3 solution for disposal or recovery. The LDH was then dissolved in HNO3 and the solution can be used to treat wastewater to reform Zn–Al LDH for further removal of arsenate. This process was repeated four times but after the fifth cycle, the removal efficiency went down by the loss of Al3+ to solution but the process can be repeated by replenishing the solution with Al3+. The newly developed process is eminently suited for remediation of arsenate and alkali simultaneously from alkaline wastewater.
Co-reporter:Penggang Li;Leipeng Liu;Ling Ding;Yihe Zhang
Journal of Applied Polymer Science 2016 Volume 133( Issue 9) pp:
Publication Date(Web):
DOI:10.1002/app.43081
ABSTRACT
In this work, electrospinning technique was used to prepare low dielectric constant membranes. First, three kinds of polyimide (PI) fiber membranes were fabricated by electrospinning of poly(amic acid) (PAA) solutions which are from polycondensation of 4,4′-oxidianiline (ODA) and three dianhydrides, pyromellitic dianhydride (PMDA), 2,2′-bis(3,4-dicarboxyphenyl) hexafluropropane dianhydride (6FDA) and 1,2,4,5-cyclohexanetetracarboxylic dianhydride(HPMDA), followed by imidization at higher temperature. The relationship of the fiber morphology, thermostability and dielectric properties of the membranes with the polymer structure were discussed. Under the same conditions, PAAs with more flexible structure are easier to form low viscosity solution and fabricate high pore fraction membranes which are low dielectric constant materials. Under the coupling effect of fluorine-containing groups and contribution of pores, the dielectric constant of 6FDA-containing PI is lowered to 1.21 at 1 KHz with lower dielectric loss which accords with the calculated one. Also the 5% weight loss temperature of the three kinds of PIs is all higher than 400°C. The formed electrospun membranes are thermostable low dielectric constant materials. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43081.
Co-reporter:Leipeng Liu;Yihe Zhang;Bing Yang;Xianghai Meng
Polymer Composites 2016 Volume 37( Issue 7) pp:2001-2007
Publication Date(Web):
DOI:10.1002/pc.23378
This work presents the potential use of red mud (RM), which is a waste of industrial alumina, as a filler of a biodegradable polymer, poly(butylene adipate-co-terephthalate) (PBAT), to prepare environment friendly composite materials (RM/PBATs). The rheological properties and crystallization behavior of RM/PBAT composites with different contents of RM (0, 10, 20, 30, 40, and 50 wt%) were investigated in detail. After incorporating of RM, the crystalline temperature of PBAT was greatly improved. When the content of RM was 30 wt%, the crystalline temperature was up to 96.0°C which widened its' use. The rheological properties of the composites such as the storage modulus, loss modulus, and viscosity as well as the melting and crystalline temperature of the composites were also increased, whereas the crystallinity was slightly decreased with the increasing of RM. The prepared composite is expected in the future to be used for packaging materials. The scanning electron microscopy (SEM) was used to investigate the dispersion of RM in the PBAT matrix which had direct effect on the above properties. POLYM. COMPOS., 37:2001–2007, 2016. © 2015 Society of Plastics Engineers
Co-reporter:Ling Ding;Leipeng Liu;Penggang Li, ;Wangshu Tong ;Yihe Zhang
Journal of Applied Polymer Science 2016 Volume 133( Issue 12) pp:
Publication Date(Web):
DOI:10.1002/app.43041
ABSTRACT
The preparation of high-dielectric-constant (k) materials is important in the field of electronics. However, how to effectively use the function of fillers to enhance k is still a challenge. In this study, anisotropic graphene (GNS)–iron oxide (Fe3O4)/polyimide (PI) nanocomposite films with oriented GNSs were prepared by the in situ polymerization of 4,4′-oxydianiline and pyromellitic anhydride in the presence of GNS–Fe3O4. Films of the precursors were fabricated, and this was followed by stepwise imidization under a magnetic field at a higher temperature to orient the magnetic sheets. The orientation of GNS–Fe3O4 and the relationships of the GNS–Fe3O4 content and measurement frequency with the dielectric properties of the GNS–Fe3O4/PI films were studied in detail. The dielectric property differences of the GNS–Fe3O4/PIs with GNS–Fe3O4 parallel or perpendicular to the film surface were not obvious, when the content of GNS–Fe3O4 was lower than 5 wt %. However, at the percolation threshold, the k values of GNS–Fe3O4/PI films with horizontal GNS–Fe3O4 were much higher than those of the other two kinds of films at 103 Hz; this was derived from the contribution of more effective microcapcitors parallel to the film surface. So, making the GNS–Fe3O4 parallel to the film surface greatly enhanced k of GNS–Fe3O4. However, switching the charges on the large lateral surface of the parallel GNSs with the electric field also caused a higher dielectric loss and the frequency dependence of k and the dielectric loss at low frequency. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43041.
Co-reporter:Xue Chen, Fengzhu Lv, Penggang Li, Yihe Zhang
Optical Materials 2016 Volume 54() pp:276-281
Publication Date(Web):April 2016
DOI:10.1016/j.optmat.2016.02.026
•Phosphors RbCaGd(PO4)2:Ce3+, Mn2+ were synthesized for the first time.•Structural and luminescent properties of as-synthesized phosphors were investigated.•The efficient energy transfer from the Ce3+ to Mn2+ ions was achieved.•With tuning the ratio of Ce3+ to Mn2+, the color change from blue to yellow.RbCaGd(PO4)2 doped with Ce3+, Mn2+ was synthesized by the sol-gel method. The crystal structure and crystallographic location of Ce3+ in RbCaGd(PO4)2 were identified by Rietveld refinement. Powder X-ray diffraction (XRD) revealed that the structure of RbCaGd(PO4)2:Ce3+ compounds is hexagonal structure which is similar to that of hexagonal LnPO4 with the lattice constant of a = b = 7.005(57) Å, c = 6.352(05) Å, and V (cell volume) = 269.980 Å3. The photoluminescence behavior and emission mechanism were studied systematically by doping activators in the RbCaGd(PO4)2 host. The Mn2+ incorporated RbCaGd(PO4)2:Ce3+, Mn2+ compounds exhibited blue emission from the parity- and spin-allowed f-d transition of Ce3+ and orange-to-red emission from the forbidden 4T1 → 6A1 transition of Mn2+. The emission chromaticity coordinates of RbCaGd(PO4)2:0.10Ce3+, xMn2+ (x = 0.16, 0.25) are close to the white region due to an energy transfer process and the energy transfer mechanism from Ce3+ to Mn2+ in the RbCaGd(PO4)2 host was dominated by dipole-dipole interactions.In this letter, a novel double-phosphate phosphor, RbCaGd(PO4)2:Ce3+, Mn2+ was prepared by the sol-gel method. The crystal structure was determined in the first time based on Rietveld refinements. Based on the experimental results and the theoretical calculation, it is identified that the dipole-dipole interaction plays a major role in the mechanism of energy transfer from Ce3+ to Mn2+ in this phosphor. Tunable luminescence can be accomplished from the RbCaGd(PO4)2:Ce3+, Mn2+ phosphors by adjusting the contents of Mn2+ and the emission can be varied from blue (0.1701, 0.0294) to yellow (0.3766, 0.4209).
Co-reporter:Fengzhu Lv, Linan Xu, Yihe Zhang, and Zilin Meng
ACS Applied Materials & Interfaces 2015 Volume 7(Issue 34) pp:19104
Publication Date(Web):August 3, 2015
DOI:10.1021/acsami.5b04569
A stable drug release system with magnetic targeting is essential in a drug delivery system. In the present work, layered double hydroxide assemblies stabilized by layer-by-layer polymer multilayers were prepared by alternative deposition of poly(allylamine hydrochloride) and poly(acrylic acid) species on composite particles of Fe3O4 and ZnAl-LDH and then covalent cross-linkage of the polymer multilayers by photosensitive cross-linker. The successful fabrication was recorded by Zeta potential and Fourier transform infrared spectrum measurements. The formed assemblies were stable in high pH solutions (pH > 7). The drug loading capacity and release behavior of the assemblies could be controlled by treatment with appropriate acidic solution, and were confirmed by loading and release of a simulated drug, methylene blue. The formed assemblies possessed enough saturated magnetic strength and were sensitive to external magnetic field which was essential for targeting drug delivery. The formed assemblies were multifunctional assemblies with great potential as drug delivery system.Keywords: controlled drug release; covalent stabilization; etching; layer-by-layer; Layered double hydroxide
Co-reporter:Fengzhu Lv;Linan Xu;Zixian Xu;Liling Fu;Yihe Zhang
Journal of Applied Polymer Science 2015 Volume 132( Issue 1) pp:
Publication Date(Web):
DOI:10.1002/app.41224
ABSTRACT
Anisotropic cetylpyridinium modified magnetic montmorillonite/polyimide (CPC-Fe3O4-MMT/PI) composite films were prepared based on CPC-Fe3O4-MMT capable of exfoliation and magnetic-field response via in situ polymerization and relatively low magnetic field adjustment (0.6 T) in the film casting followed by imidization. The stability of CPC-Fe3O4-MMT during the in situ polymerization over flow shearing of the polymers and longtime stirring was evaluated by comparison the composition of CPC-Fe3O4-MMT before and after polymerization via TG analysis and element analysis. Besides, the structural anisotropy of the produced CPC-Fe3O4-MMT/PI composite films deriving from orientation of plate-like CPC-Fe3O4-MMT was confirmed by 1-D and 2-D XRD and SEM. The CPC-Fe3O4-MMT/PI composite films with structural anisotropy exhibit gas permeation, optical and magnetic anisotropic properties which would widen the application fields of the composite films. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41224.
Co-reporter:Fengzhu Lv;Leipeng Liu;Yihe Zhang;Penggang Li
Journal of Applied Polymer Science 2015 Volume 132( Issue 7) pp:
Publication Date(Web):
DOI:10.1002/app.41480
ABSTRACT
Low dielectric constant polyimide (PI) films have potential applications in integrated circuit. In this study, poly(methyl methacrylate), poly(ethylene oxide), and polystyrene as thermally labile materials were used as templates to generate PI films with nanopores by first mixing the polymer templates with the precursor of PI, poly(amic acid), followed by imidization of poly(amic acid) together with degradation of the polymer templates. The sizes of the formed pores, the thermal and dielectric constant of the nanofoamed PI films were studied and compared in detail. It is concluded that the dielectric constant of PI films using poly(ethylene oxide) as pore template is more stable because of the formation of uniform pores which is from the great accordance of imidization temperature of poly(amic acid) with the degradation temperature of poly(ethylene oxide). But that using poly(methyl methacrylate) as pore template is frequency dependent as the influence of inhomogeneous pores and PMMA residue from incompletely degradation of poly(methyl methacrylate). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41480.
Co-reporter:Zilin Meng, Xiaowei Li, Fengzhu Lv, Qian Zhang, Paul K. Chu, Yihe Zhang
Colloids and Surfaces B: Biointerfaces 2015 Volume 135() pp:339-345
Publication Date(Web):1 November 2015
DOI:10.1016/j.colsurfb.2015.07.069
•Aspirin was firstly intercalated into Zn–Al-layered double hydroxides by two methods and released in two buffered solutions: phosphate and borate buffered saline.•By molecular simulation, the firstly illuminate the different arrangement of molecules in LDH interlayers influenced by different preparation.•In the release process, the first time explain the anion exchange process by bonding energy calculated by Material Studio.•Experimental phenomenon that the structure of LDH was destroyed after release in phosphate buffered saline is first reported and analyzed.Aspirin or acetylsalicylic acid (AA), a non-steroidal anti-inflammatory drug, is intercalated into Zn–Al-layered double hydroxides (ZnAl-LDHs) by co-precipitation and reconstruction methods. The composition, structure, and morphology of the intercalated products as well as their release behavior are determined experimentally and theoretically by Material Studio 5.5. Experimental results disclose the strong interaction between the LDHs sheets and AA in the intercalated ZnAl-LDHs produced by co-precipitation and slow release of AA from the intercalated ZnAl-LDHs in both phosphate buffered saline (PBS) and borate buffered saline (BBS) solutions. The percentage of AA released from the ZnAl-LDHs prepared by both methods in PBS (96.87% and 98.12%) are much more than those in BBS (68.59% and 81.22%) implying that both H4BO4− and H2PO4− can exchange with AA in the ZnAl-LDHs. After AA is released to PBS, ZnAl-LDHs break into small pieces. The experimental results are explained theoretically based on the calculation of the bonding energy between the anions and LDHs sheets as well as the AlO bond length change in the LDHs sheets.
Co-reporter:Fengzhu Lv, Liling Fu, Emmanuel P. Giannelis, Genggeng Qi
Solid State Sciences 2014 Volume 34() pp:49-55
Publication Date(Web):August 2014
DOI:10.1016/j.solidstatesciences.2014.05.006
•Monodispersed magnetic mesoporous nanoparticles were prepared by using SiO2 capsule as support.•The optimum conditions for preparation of γ-Fe2O3/SiO2-capsule were determined.•The magnetic response and DOX release behaviors of γ-Fe2O3/SiO2-capsule were studied.•γ-Fe2O3/SiO2-capsule possesses drug delivery ability and magnetic target functions.Series of nanocomposites with γ-Fe2O3 supported on SiO2-capsules were prepared by adsorption of hydrophobic iron acetylacetonate on the hydrophilic surface of SiO2-capsules in the evaporation process of the solvent and then calcination the complex at 450 °C. The adsorption and calcination conditions were studied and the resultant nanaoparticles were characterized by XRD, XRF and TEM in detail. The results indicated that γ-Fe2O3 loaded discontinuously but uniformly on the surface of SiO2-capsules at appropriate content. The specific surface area characterization and doxorubicin hydrochloride release shown although the surface area of the target composites decreased slightly, the nanoparticles still had large potential using as drug delivery and magnetic targeting system.
Co-reporter:Pan Hu;Yihe Zhang;Xinke Wang;Fangfang Wei
Water, Air, & Soil Pollution 2014 Volume 225( Issue 4) pp:
Publication Date(Web):2014 April
DOI:10.1007/s11270-014-1936-7
The novel adsorbent Cu-impregnated activated coke (CAC) has been successfully prepared using a Cu(NO3)2 solution impregnated activated coke (AC). The optimum preparation conditions of CAC are the concentration of Cu(NO3)2 of 0.1 mol/L, pH of 6, loading time of 4 h, and loading temperature of 333 K. The characterizations of CAC are analyzed by N2 adsorption, X-ray diffraction, scanning electron microscope, and energy dispersive X-ray spectroscopy. Also the adsorption behavior of CAC to organic materials in TNT red water is studied. The adsorption data are simulated by Freundlich isotherm and Langmuir isotherm. Below 333 K Freundlich isotherm is more suitable, while Langmuir isotherm model is more fitted when the temperature is higher than 333 K. The adsorption kinetics follows a pseudo second-order model, and thermodynamic analysis indicates an endothermic and spontaneous adsorption processes, and the process appears to be controlled by the chemisorption process. Chemical oxygen demand of 85.34 % can be removed as CAC prepared under optimized conditions is used as absorbent. In summary, CAC has excellent absorption characteristics and can be used in the removal of organic materials from TNT red water.
Co-reporter:Linan Xu ; Fengzhu Lv ; Yihe Zhang ; Xinglong Luan ; Qian Zhang ;Qi An
The Journal of Physical Chemistry C 2014 Volume 118(Issue 35) pp:20357-20362
Publication Date(Web):August 11, 2014
DOI:10.1021/jp505225z
Constructing stable and reliable interfaces around pseudo two-dimensional clay materials is a key process in achieving advanced and reliable performance of related composite materials. However, the effective surface modification of pseudo two-dimensional clay has been a challenging research topic. In this study, we have developed an effective and facile method for the interfacial modification of magnetic montmorillonite (MMT) nanocomposite by using covalent layer-by-layer (LbL) assembly. The method involves conventional LbL assembly around the magnetic MMT followed by infiltration of a bifunctional photoactive small molecule and then covalent cross-linking of the LbL multilayers upon UV irradiation. After covalent LbL modification, the nanocomposite presented ample organic species around its interfaces and displayed stable organic interfaces even in extreme solution conditions such as in basic (pH =14) solutions. The covalent cross-linking of the multilayers proved to be indispensable in keeping the LbL multilayers stable around the MMT composites. After modification, the composite particles kept their magnetic properties. In addition, the release profile of the composite particles for methyl blue indicated that the composite particles preserved the capacity to carry loads and release them in retarded speed. This method will potentially integrate the merits of LbL multilayers with MMT to achieve advanced functional materials.
Co-reporter:Fengzhu Lv;Runze Zhang;Linan Xu
Journal of Sol-Gel Science and Technology 2014 Volume 69( Issue 1) pp:26-32
Publication Date(Web):2014 January
DOI:10.1007/s10971-013-3180-9
Surfactant-intercalated MgFe-layered double hydroxides (MgFe-LDHs) were successfully synthesized via one-step self-assembly of the surfactants (sodium dodecyl sulfate, 1-hexadecane sulfate, and sodium dodecyl benzene sulfonate) and the LDH precursors without avoiding dissolved CO32−. As a control, p-toluene sulfonic acid was used to further study the functions of surfactants. The detailed characterization of the surfactant intercalated MgFe-LDHs and their intermediates confirm that the basal spacing changes of the formed LDHs derive from the release of surfactants out of LDH interlayers or the adsorption of surfactants from the solution in the reaction. Besides, the Mg/Fe ratio of the LDH sheets increases with the reaction and the corresponding ionic exchange capacity (IEC) of the MgFe-LDHs decreases. The final surfactant intercalated MgFe-LDH particles are the mixture of MgFe-LDH sheets with different composition and IEC, which can be the basic principle of LDH preparation for different applications. Also the Mg/Fe ratio of the surfactant intercalated MgFe-LDHs decreases with the increase of molecular length of surfactants used.
Co-reporter:Penggang Li;Zixian Xu;Genggeng Qi;Yihe Zhang
Journal of Materials Science 2013 Volume 48( Issue 16) pp:5437-5446
Publication Date(Web):2013 August
DOI:10.1007/s10853-013-7337-2
Surfactant-intercalated Zn and Al layered double hydroxides (ZnAl-LDHs) were synthesized via spontaneous self-assembly of the surfactants (sodium dodecyl sulfate and sodium dodecyl benzene sulfonate) and the LDH salt precursors. To understand the function of the surfactants in the synthesis, the surfactant-modified ZnAl-LDHs and their intermediates before aging were characterized via X-ray diffraction, Fourier transform infrared spectroscopy, Field emission scanning electron microscopy, and thermogravimetric analysis. In addition, fluorescence spectroscopy was used to in situ trace the microenvironmental variations of the reactants in the synthesis. It was found that the anionic surfactants can interact with the LDH precursors to form cooperative micellar assemblies, which increase the concentration of cationic counter ions around the micelles leading to enhanced growth of the LDH sheets along their lamellar surface direction and the stacking of LDH sheets into nanoparticles as the surfactant possesses longer molecular length. Because of the hydrophobicity of the intermediate sheets coated with surfactants, the reaction between the dissolved CO32− and the LDH intermediate sheets can be greatly reduced, and thus no strict N2 protection was necessary in this method. This mechanistic understanding of the effects of the surfactants on the formation of LDHs is critical in successful synthesis of organic-intercalated LDHs in complicated system by void the interruption of competitive ions.
Co-reporter:Yihe Zhang, Fengzhu Lv, Shaojian Ke, Li Yu, Haitao Huang, H.L.W. Chan
Materials Chemistry and Physics 2011 Volume 129(1–2) pp:77-82
Publication Date(Web):15 September 2011
DOI:10.1016/j.matchemphys.2011.03.057
Hollow SiO2 nanospheres with diameter ranging from 50 to 70 nm were obtained by the template method. The core–shell structured hollow nano-SiO2@poly(methyl acrylate) nanoparticles and nano-SiO2@poly(methyl acrylate) nanoparticles/poly(methyl acrylate) composites were prepared by seed emulsion polymerization. The results indicated that the SiO2 nanoparticles showed good dispersion stability, and their compatibility with the polymer matrix was improved noticeably. The mechanical property, dynamic mechanical property and rigidity of the latex films were greatly improved when the content of silica in the composites was small. Moreover, it was found that the damping capacity could only be improved when hollow SiO2 was covalently bonded to poly(methyl acrylate) matrix.Highlights► Core-shell hollow silica/PMA composites were synthesized by grafting method. ► The hollow structure and linking style in the system was studied systematically. ► The damping capacity was improved by introduction of covalently bonded hollow SiO2.
Co-reporter:Yihe Zhang, Chunxiao Yu, Pan Hu, Wangshu Tong, Fengzhu Lv, Paul K. Chu, Heli Wang
Applied Clay Science (January 2016) Volume 119(Part 1) pp:96-102
Publication Date(Web):January 2016
DOI:10.1016/j.clay.2015.07.022
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