Co-reporter:Linlin Dong, Chao Shi, Lanlan Guo, Ting Yang, Yuexin Sun, Xuejun Cui
Ultrasonics Sonochemistry 2017 Volume 36() pp:437-445
Publication Date(Web):May 2017
DOI:10.1016/j.ultsonch.2016.12.027
•The graphene oxide microcapsules were prepared by ultrasonication method.•The graphene oxide microcapsules could be engulfed by Hela cells successfully.•The graphene oxide microcapsules possess magnetic responsive, redox-responsive and pH-responsive abilities.In this study, the biocompatible redox and pH dual-responsive magnetic graphene oxide microcapsules (MGOMCs) were prepared by a simple sonochemical method. The disulfide bonds cross-linked the wall of MGOMCs were formed from the hydrosulfuryl on the surface of thiolated graphene oxide, which was synthesized by functionalizing graphene oxide with cysteine, showed an excellent redox-responsive property to control drugs release. Moreover, oleic acid modified Fe3O4 nanoparticles were encapsulated into the microcapsules successfully with the hydrophobic drugs dispersed in the hydroxy silicone oil. The MGOMCs possess distinguished magnetic property and pH-responsive ability. Besides, the microcapsules could be engulfed by Hela cells successfully due to the appropriate size and flexible shell. The MGOMCs could be a good carrier for hydrophobic drugs, especially the anticancer drugs.
Co-reporter:Shuangling Zhong, Huan Zhang, Yunhong Liu, Gaoxu Wang, Chao Shi, Zhanfeng Li, Yuxiang Feng, Xuejun Cui
Carbohydrate Polymers 2017 Volume 168(Volume 168) pp:
Publication Date(Web):15 July 2017
DOI:10.1016/j.carbpol.2017.03.083
•A versatile nanocapsules were designed and fabricated with sonochemical method.•Targeting molecules and nanoparticles are immobilized onto nanocapsules.•The nanocapsules showed an excellent magnetic responsive property.•The nanocapsules showed superior reduction-responsive drug release property.A versatile folic acid (FA)-functionalized reduction-responsive magnetic chitosan (CS) nanocapsules (FA-RMCNCs) were designed and fabricated successfully from FA-functionalized thiolated chitosan with a simple sonochemical method. The targeting molecule (FA), red fluorescent probes (Rhodamine B isothiocyanate, RITC) and thiolated Fe3O4 magnetic nanoparticles (Fe3O4-SH MNPs) were immobilized in and onto the shells of nanocapsules. The as-synthesized FA-RMCNCs had a well-defined spherical morphology with the size of 200–350 nm. As the carriers, FA-RMCNCs showed an excellent magnetic responsive property. The CLSM analysis revealed that the proposed FA-RMCNCs with core-shell constructure could be internalized selectively by the HeLa cells through the folate-mediated endocytosis. Moreover, the reductant-triggered release of coumarin 6 suggested that the FA-RMCNCs possessed superior reduction-responsivity of drug release. This study reveals the potential of FA-RMCNCs as magnetic/reduction dual-responsive, folate-receptor-mediated targeting nanocarriers in targeted delivery and controlled release of hydrophobic drugs.
Co-reporter:Xuejun Cui, Xinyu Guan, Shuangling Zhong, Jie Chen, Houjuan Zhu, Zhanfeng Li, Fengzhi Xu, Peng Chen, Hongyan Wang
Ultrasonics Sonochemistry 2017 Volume 38(Volume 38) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.ultsonch.2017.03.011
•A multi-stimuli responsive carrier were fabricated with sonochemical method.•The microcapsules were functionalized by folic acid.•The microcapsules showed an excellent magnetic responsive property.•The microcapsules showed superior reduction-responsive drug release property.In the present study, we designed a novel, multi-stimuli responsive, biocompatible and non-immunogenic smart carrier for targeted delivery and triggered release of hydrophobic drugs. The designed multi-stimuli responsive smart chitosan-based microcapsules (MSRS-CS-MCs) have been fabricated successfully from folic acid (FA) functionalized thiolated chitosan via a facile sonochemical method. Targeting moiety FA and red fluorescent dye (Rhodamine B isothiocyanate, RITC) were immobilized onto the shells of microcapsules. Meanwhile, oleic acid (OA) modified Fe3O4 magnetic nanoparticles (OA-Fe3O4 MNPs) and a model hydrophobic drug, green fluorescent dye (Coumarin 6, C6), were encapsulated into the microcapsules. As drug carriers, the obtained spherical MSRS-CS-MCs with the average size of 500 nm showed excellent magnetic responsive ability, favorable selectively folate-receptor-mediated targeting functionality to the HeLa cells, and attractive reduction-responsive release ability for hydrophobic drugs. The integration of magnetic and reduction dual-responsiveness, folate-receptor-mediated targeting functionality and fluorescence visualization into the versatile microcapsules make MSRS-CS-MCs promising nanocarriers for future biomedical applications.
Co-reporter:Zhanfeng Li, Ting Yang, Chunming Lin, Quanshun Li, Songfeng Liu, Fengzhi Xu, Hongyan Wang, and Xuejun Cui
ACS Applied Materials & Interfaces 2015 Volume 7(Issue 34) pp:19390
Publication Date(Web):August 14, 2015
DOI:10.1021/acsami.5b05558
A facile sonochemical approach is designed to fabricate protein nanocapsules for hydrophilic drugs (HDs), and HD-loaded multifunctional bovine serum albumin (BSA) nanocapsules (MBNCs) have been prepared for the first time. The as-synthesized HD-loaded MBNCs have a satisfying size range and an excellent magnetic responsive ability. Moreover, high-dose hydrophilic drugs could be loaded into the MBNCs. As carriers, HD-loaded MBNCs also show attractive redox-responsive controlled release ability for hydrophilic drugs and could be internalized selectively by the tumor cells through the folate-mediated endocytosis.Keywords: hydrophilic drug; magnetic responsive; nanocapsule; redox-responsive; sonochemical
Co-reporter:Shuangling Zhong, Chenggang Sun, Yushan Gao, Xuejun Cui
Journal of Power Sources 2015 Volume 289() pp:34-40
Publication Date(Web):1 September 2015
DOI:10.1016/j.jpowsour.2015.04.163
•Silicon-containing core-shell structured nanocomposite latex particles are prepared.•The nanocomposite membranes show good thermal and dimensional stability at high temperature.•Excellent methanol barrier and high selectivity are achieved.•The membranes with low cost and good property show potential application as PEMs in DMFCs.A series of silicon-containing core-shell structured polyacrylate/2-acrylamido-2-methyl-1-propanesulfonic acid (SiO2-CS-PA/A) nanocomposite latex particles are prepared by the emulsifier-free emulsion polymerization of acrylate monomers and various amount of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) with colloidal nanosilica particles as seed. The chemical and morphological structures of latex particles with high monomer conversion are determined using Fourier transform infrared (FTIR), dynamic light scattering (DLS) and transmission electron microscopy (TEM). The SiO2-CS-PA/A nanocomposite membranes are fabricated through pouring the latex onto a clean surface of glass and drying at 60 °C for 10 h and 120 °C for 2 h. The nanocomposite membranes possess good thermal and dimensional stability. In addition, in comparison to Nafion® 117, the nanocomposite membranes exhibit moderate proton conductivity, significantly better methanol barrier and selectivity. The methanol diffusion coefficient is in the range of 1.03 × 10−8 to 5.26 × 10−8 cm2 s−1 which is about two orders of magnitude lower than that of Nafion® 117 (2.36 × 10−6 cm2 s−1). The SiO2-CS-PA/A 5 membrane shows the highest selectivity value (2.34 × 105 S cm−3) which is approximately 11.0 times of that (2.13 × 104 S cm−3) of Nafion® 117. These results indicate that the nanocomposite membranes are promising candidates to be used as polymer electrolyte membranes in direct methanol fuel cells.
Co-reporter:Zhanfeng Li, Fengzhi Xu, Quanshun Li, Songfeng Liu, Hongyan Wang, Helmuth Möhwald, Xuejun Cui
Colloids and Surfaces B: Biointerfaces 2015 Volume 136() pp:470-478
Publication Date(Web):1 December 2015
DOI:10.1016/j.colsurfb.2015.09.056
•FA-BSA@Fe3O4 MCs are prepared by the sonochemical method.•FA-BSA@Fe3O4 MCs are non-toxic and have a suitable size range.•FA-BSA@Fe3O4 MCs are magnetic and molecular dual-targeted for specific delivery.•FA-BSA@Fe3O4 MCs are thermo- and redox-responsive for controlled drug release.Multifunctional folic acid conjugated BSA@Fe3O4 microcapsules (FA-BSA@Fe3O4 MCs) have been prepared successfully based on the sonochemical method. The as-synthesized FA-BSA@Fe3O4 MCs have a suitable size range for biomedical applications, and a high loading capacity for water-insoluble drugs. Furthermore, FA-BSA@Fe3O4 MCs show excellent magnetic properties. Cytotoxicity tests indicate that FA-BSA@Fe3O4 MCs are non-toxic. Cellular uptake and flow cytometric assay illustrate together that FA-BSA@Fe3O4 MCs can target tumor cells selectively through molecular targeted endocytosis. As carriers for water-insoluble drugs, FA-BSA@Fe3O4 MCs are also proved to possess superior redox- and thermo- dual responsiveness for controlled drug release.Novel multifunctional BSA microcapsules are prepared for hydrophobic drugs based on the sonochemical method. The microcapsules are smart carriers for targeted drug delivery and controlled drug release.
Co-reporter:Zhanfeng Li, Cong Zhang, Bingnan Wang, Hongyan Wang, Xuesi Chen, Helmoth Möhwald, and Xuejun Cui
ACS Applied Materials & Interfaces 2014 Volume 6(Issue 24) pp:22166
Publication Date(Web):November 28, 2014
DOI:10.1021/am5057097
In the present study, the molecular and magnetic dual-targeted redox-responsive folic acid–cysteine–Fe3O4 microcapsules (FA–Cys–Fe3O4 MCs) have been synthesized via the sonochemical technique, and targeting molecule (folic acid) and Fe3O4 magnetic nanoparticles are introduced into the microcapsule shells successfully. The obtained FA–Cys–Fe3O4 MCs show excellent magnetic responsive ability by the oriented motion under an external magnetic field. The hydrophobic fluorescent dye (Coumarin 6) is successfully loaded into the FA–Cys–Fe3O4 MCs, demonstrating that it could be also easily realized to encapsulate hydrophobic drugs into the FA–Cys–Fe3O4 MCs when the drugs are dispersed into the oil phase before sonication. Cellular uptake demonstrates that FA–Cys–Fe3O4 MCs could target selectively the cells via folate-receptor-mediated endocytosis. Moreover, the FA–Cys–Fe3O4 MCs show their potential ability to be an attractive carrier for drug controlled release owing to the redox responsiveness of the disulfide in the microcapsule shells.Keywords: dual-targeted; microcapsule; redox-responsive; sonochemical
Co-reporter:Zaihang Zheng;Juntao Yan;Huimin Sun;Zhiqiang Cheng;Wenjie Li;Hongyan Wang
Polymer International 2014 Volume 63( Issue 1) pp:84-92
Publication Date(Web):
DOI:10.1002/pi.4477
Abstract
A facile and effective method for the preparation of microencapsulated ammonium polyphosphate (MAPP) by in situ surface polymerization was introduced. The ‘polyurethane-like’ shell structure on the surface of MAPP was characterized by using Fourier transform infrared spectroscopy. The hydrophobicity and thermal behavior of MAPP were studied by using water contact angle tests and thermogravimetric analysis. The foam density and mechanical properties of polyurethane (PU) rigid foams were investigated. The flame retardancy of PU rigid foams formulated with MAPP was evaluated by using limiting oxygen index and cone calorimetry. The results show that MAPP can greatly increase the flame retardancy of PU materials. Also, there is a synergistic effect between MAPP and expandable graphite in flame retarding PU rigid foams. Moreover, the water resistance property of PU/MAPP composites is better than that of PU/ammonium polyphosphate. The morphology and chemical structure of PU/MAPP rigid foams after burning were systematically investigated. © 2013 Society of Chemical Industry
Co-reporter:Linhui Qiang, Ting Yang, Zhanfeng Li, Hongyan Wang, Xuesi Chen, Xuejun Cui
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2014 Volume 456() pp:62-66
Publication Date(Web):20 August 2014
DOI:10.1016/j.colsurfa.2014.04.058
•We built the interface models between biocompatible polymers and Fe3O4.•The polymer with hydrogen bond donor has a strong interaction with Fe3O4.•The high flexibility polymer chain might form a dense polymer layer on Fe3O4.Molecular dynamics simulation was employed to investigate the interaction mechanism between several kinds of biocompatible polymers and Fe3O4 (1 1 1) surface at the atomic level. The interaction energies between Fe3O4 (1 1 1) surface and different biocompatible polymers implied that the interactions between polysaccharides (chitosan and dextran) and Fe3O4 (1 1 1) surface were stronger than that of polyesters (PLGA and PLA), PEI and PEG. The existence of the hydrogen bonds between the functional groups of polysaccharides and the oxygen atoms of Fe3O4 (1 1 1) surface have been proved by the radial distribution function analysis, which might be the reason of forming strong interaction. By contrast, the weak interactions between the polymers else and Fe3O4 (1 1 1) surface have formed because of the intermolecular force between oxygen or nitrogen atoms on polymers and the iron atoms on Fe3O4 (1 1 1) surface. It could be seen from concentration profiles, only the distance between the innermost layer polymer and Fe3O4 (1 1 1) surface have influenced by the interfacial interactions. The flexibility of polymer chain was proved to be the most important factor for affecting the morphology of polymer on Fe3O4 (1 1 1) surface by analyzing the mean squared displacement. From the simulation snapshot, it could be seen that the distribution of PEG, which had the weakest interaction with Fe3O4 (1 1 1) surface and the highest flexibility, was compact on the Fe3O4 (1 1 1) surface. This study revealed that the stable interface would form easily between the polymer with hydrogen bond donor and Fe3O4 (1 1 1) surface and the high flexibility of polymer chain might be propitious to the formation of the dense polymer layer on Fe3O4 (1 1 1) surface.
Co-reporter:Zaihang Zheng;Wenjie Li;Huimin Sun;Zhiqiang Cheng;Juntao Yan;Hongyan Wang
Polymer Composites 2013 Volume 34( Issue 7) pp:1110-1118
Publication Date(Web):
DOI:10.1002/pc.22519
A facile and effective method was introduced into this article to modify carbon black (CB). Fourier-transform infrared spectrum demonstrates the chemical structure of CB has obviously changed after surface modification. Compared with pure CB, the thermogravimetric analysis illustrates thermal behavior of modified CB (MCB) exhibits a well-defined difference from CB. Besides, aggregation phenomenon existed in CB is weakened evidently after surface modification. A series of polystyrene (PS) composite beads in presence of MCB were synthesized via in situ suspension polymerization process. The effects of benzoyl peroxide dosage and MCB dosage on the polymerization time of PS composite beads were systematically researched. After modification, the inhibition effect of MCB on the polymerization of PS/MCB composite beads is obviously weakened. The dispersion of MCB in PS/MCB composite beads is greatly improved than that of CB in PS/CB composite beads. Moreover, PS/MCB beads have the better thermal stability than that of PS and PS/CB composite beads. POLYM. COMPOS., 34:1110–1118, 2013. © 2013 Society of Plastics Engineers
Co-reporter:Dr. Xuejun Cui;Zhanfeng Li;Dr. Shuangling Zhong;Bingnan Wang;Dr. Yongsheng Han; Hongyan Wang; Helmuth Möhwald
Chemistry - A European Journal 2013 Volume 19( Issue 29) pp:9485-9488
Publication Date(Web):
DOI:10.1002/chem.201301302
Co-reporter:Xuejun Cui;Bingnan Wang;Shuangling Zhong;Zhanfeng Li
Colloid and Polymer Science 2013 Volume 291( Issue 10) pp:2271-2278
Publication Date(Web):2013 October
DOI:10.1007/s00396-013-2962-5
Protein microcapsules with narrow size distribution have been prepared by sonochemical method which is a simple, fast, environmental friendly and cost-effective method. The prepared microcapsules are composed of a water-insoluble core and an outer protein shell. The hydrophobic drugs could be encapsulated into protein microcapsules directly via sonochemical method by dissolving drugs in the nontoxic and edible vegetable oil before ultrasonication, which is a potential solution for drug resistance by hiding cytotoxic drugs in the carrier and allows for the delivery of high doses in relatively small volume. The size and size distribution of protein microcapsules are very important for their practical application. In this paper, the factors affecting the size and size distribution of protein microcapsules are investigated in detail. Moreover, confocal laser scanning microscopy and transmission electron microscopy confirmed that the protein microcapsules with narrow size distribution were obtained.
Co-reporter:Linhui Qiang, Zhanfeng Li, Tianqi Zhao, Shuangling Zhong, Hongyan Wang, Xuejun Cui
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2013 Volume 419() pp:125-132
Publication Date(Web):20 February 2013
DOI:10.1016/j.colsurfa.2012.11.055
Molecular dynamics (MD) simulation was employed to study chitosan adsorption on different Fe3O4 crystallographic planes at the atomic level. The interaction energy between chitosan and different Fe3O4 surfaces indicates that the interaction of chitosan and Fe3O4 (1 1 1) surfaces is stronger than that of (1 1 0) and (0 0 1) surfaces. The concentration profiles show that hydrogen and amino groups of chitosan could form strong interactions with the surfaces of Fe3O4. The radial distribution function show that the probability of forming hydrogen bonds between groups of chitosan and oxygen atoms on Fe3O4 (1 1 1) surface is more than that of Fe3O4 (1 1 0) surface, and the nitrogen atoms and iron atoms on the surface have weak physical interactions. This study provides useful information in understanding the interfacial interaction mechanism at the atomistic scale for polymer and mineral.Highlights► We built the interface model between chitosan and Fe3O4. ► The (1 1 1) interface has strongest interaction than other interfaces. ► There was high probability of formed hydrogen bonds of (1 1 1) interface. ► There were interactions between Fe3O4 and nitrogen atoms of chitosan.
Co-reporter:Xuejun Cui;Yan Gao;Shuangling Zhong;Zaihang Zheng
Journal of Polymer Research 2012 Volume 19( Issue 3) pp:
Publication Date(Web):2012 March
DOI:10.1007/s10965-012-9832-6
Semi-interpenetrating polymer networks (Semi-IPNs) based on fluorine-containing polyacrylate and epoxy resin were synthesized by the simultaneous polymerization of fluorine-containing acrylate and epoxy resin. Fourier transform infrared (FTIR) spectrometry and X-ray photoelectron spectroscopy (XPS) analyses proved that the fluorine-containing groups have been introduced into Semi-IPNs successfully. In addition, XPS analysis intuitively showed that the fluorine content of the film-air interface of the interpenetrating fluorine-containing polyacrylate and epoxy resin networks (FPAER-SIPNs) film was much higher than that of the film-glass interface. It is noted that the introduction of fluorine-containing groups significantly improved the hydrophobic property of polymer networks. Moreover, when the fluorine content increased, the contact angle of water on FPAER-SIPNs film was increased obviously and the water uptake was decreased gradually. These results indicated that introducing fluorine-containing groups to SIPNs has potential advantage for improving the surface properties of epoxy resin.
Co-reporter:Juntao Yan;Chunlei Wang;Yan Gao;Zaihang Zheng;Zhiqiang Cheng;Hongyan Wang
Polymer Engineering & Science 2012 Volume 52( Issue 6) pp:1309-1316
Publication Date(Web):
DOI:10.1002/pen.23072
Abstract
In this study, the role of polyvinyl alcohol (PVA) in eliminating the inhibition phenomenon of modified light-weight carbon black (CB) during the synthesis of polystyrene/modified light-weight carbon black (PS/MLCB) composite particles was examined. It was interesting to note that the polymerization time was largely shortened in the presence of a certain PVA. And the effect of PVA dosage on the polymerization time and the macromorphology of obtained PS/MLCB composite particles were systematically investigated, as well as the correlation between PVA dosage, polymerization time, and MLCB content. In addition, the potential mechanism about the role of PVA in eliminating the inhibition phenomenon of MLCB during the suspension polymerization of styrene was also proposed and analyzed in detail. The PS/MLCB composites particles were studied in terms of surface morphology, thermal stability, and molecular weight. Scanning electron microscopy images of the resulting PS/MLCB composite particles demonstrated that CB was well dispersed in the PS matrix. And the thermal stability of obtained PS/MLCB composite particles was significantly enhanced with the incorporation of MLCB, and increased with the increasing content of MLCB. This synthesis technique brought about a promising future in the large-scale production of black expandable polystyrene. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers
Co-reporter:Chunlei Wang, Juntao Yan, Xuejun Cui, Hongyan Wang
Journal of Colloid and Interface Science 2011 Volume 354(Issue 1) pp:94-99
Publication Date(Web):1 February 2011
DOI:10.1016/j.jcis.2010.09.078
In this paper, we present a novel method for the preparation of raspberry-like monodisperse magnetic hollow hybrid nanospheres with γ-Fe2O3@SiO2 particles as the outer shell. PS@Fe3O4@SiO2 composite nanoparticles were successfully prepared on the principle of the electrostatic interaction between negatively charged silica and positively charged polystyrene, and then raspberry-like magnetic hollow hybrid nanospheres with large cavities were achieved by means of calcinations, simultaneously, the magnetite (Fe3O4) was transformed into maghemite (γ-Fe2O3). Transmission electron microscopy (TEM) demonstrated that the obtained magnetic hollow silica nanospheres with the perfect spherical profile were well monodisperse and uniform with the mean size of 253 nm. The Fourier transform infrared (FTIR) spectrometry, energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) provided the sufficient evidences for the presence of Fe3O4 in the silica shell. Moreover, the magnetic hollow silica nanospheres possessed a characteristic of superparamagnetic with saturation magnetization value of about 7.84 emu/g by the magnetization curve measurement. In addition, the nitrogen adsorption–desorption measurement exhibited that the pore size, BET surface area, pore volume of magnetic hollow silica nanospheres were 3.5–5.5 nm, 307 m2 g−1 and 1.33 cm3 g−1, respectively. Therefore, the magnetic hollow nanospheres possess a promising future in controlled drug delivery and targeted drug applications.Graphical abstractA facile method is presented for the preparation of raspberry-like monodisperse hollow hybrid nanospheres with γ-Fe2O3@SiO2 particles as the outer shell via sol–gel process.Research highlights► A facile method for preparing raspberry-like magnetic hollow nanospheres was developed. ► The Fe3O4@SiO2 particles were shapely coated on the surface of PS templates. ► The hollow nanospheres were well monodisperse and uniform with a size of 253 nm. ► The hollow nanospheres possessed large cavities and excellent magnetic properties.
Co-reporter:Yongchao Zhao, Linhui Qiang, Juntao Yan, Shijin Dong, Qiaoyun Zhang, Lisi Zhang, Xuejun Cui, Hongyan Wang
Applied Surface Science 2011 Volume 257(Issue 9) pp:4377-4383
Publication Date(Web):15 February 2011
DOI:10.1016/j.apsusc.2010.12.066
Abstract
A preparation method of waterborne crackle decorative coatings was reported in this paper and the factors that influence crack patterns were investigated. The crackle coating consisted of a waterborne basecoat and a waterborne topcoat. The basecoat was made from two-component epoxy emulsion and the topcoat was made from fluorine-containing acrylic emulsion, silicone-acrylic emulsion or styrene-acrylic emulsion. Three junction types of crack patterns were prepared by the three top coatings, which were T-junction, Y-junction and mixed junction. T-junction type with long and straight cracks was prepared from styrene-acrylic emulsion 296DS. Y-junction type with curve and short cracks was prepared from fluorine-containing acrylic emulsion A603C and mixed junctions type was made from silicone-acrylic emulsion. Crack patterns with different spacing were prepared by controlling the thickness of topcoat, dryness of basecoat or conditions of film forming. The characterize methods of type and spacing for crack pattern were developed and properties of coating film including adhesion, water resistance, scrub resistance and so on were tested. The results showed that the crackle coatings possessed satisfactory properties for practical application.
Co-reporter:Shuangling Zhong, Xuejun Cui, Sen Dou, Wencong Liu, Yan Gao, Bo Hong
Electrochimica Acta 2010 Volume 55(Issue 28) pp:8410-8415
Publication Date(Web):1 December 2010
DOI:10.1016/j.electacta.2010.07.055
Silicon-containing sulfonated polystyrene/acrylate-poly(vinyl alcohol) (Si-sPS/A-PVA) and Si-sPS/A-PVA-phosphotungstic acid (Si-sPS/A-PVA-PWA) composite membranes were fabricated by solution blending and physical and chemical crosslinking methods to improve the properties of silicon-containing sulfonated polystyrene/acrylate (Si-sPS/A) membranes. FTIR spectra clearly show the existence of various interactions and a crosslinked silica network in composite membranes. The potential of the composites to act as proton exchange membranes in direct methanol fuel cells (DMFCs) was assessed by studying their thermal and hydrolytic stability, swelling, methanol diffusion coefficient, proton conductivity and selectivity. TGA measurements show that the composite membranes possess good thermal stability up to 190 °C, satisfying the requirement for fuel cell operation. Compared to the unmodified membrane, the composites exhibit less swelling and a superior methanol barrier. Most importantly, all of the composite membranes have significantly lower methanol diffusion coefficients and significantly higher selectivity than those of Nafion® 117. The Si-sPS/A-20PVA-20PWA membrane is the best applicant for use in DMFCs because it exhibits an optimized selectivity value (5.93 × 105 Ss cm−3) that is approximately 7.8 times of that of the unmodified membrane and is 27.8 times higher than that of Nafion® 117.
Co-reporter:Chunlei Wang, Juntao Yan, Xuejun Cui, Dengli Cong, Hongyan Wang
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2010 Volume 363(1–3) pp:71-77
Publication Date(Web):20 June 2010
DOI:10.1016/j.colsurfa.2010.04.016
Magnetic hollow polymethyl methacrylate (PMMA) nanospheres were successfully obtained by etching the template of CaCO3 in the core–shell Fe3O4@CaCO3@PMMA nanospheres, which were synthesized via in situ emulsion polymerization in the presence of oleic acid-modified Fe3O4@CaCO3 composite nanoparticles. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) measurements demonstrated that the core–shell Fe3O4@CaCO3@PMMA nanospheres were uniform and possessed narrow size distributions. And a perfect spherical profile of magnetic hollow PMMA nanospheres could be also observed by TEM. Both the Fourier transform infrared (FTIR) spectrometry, high resolution TEM (HRTEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) provided the sufficient evidences for the presence of Fe3O4 in the magnetic hollow PMMA nanospheres. Thermogravimetric analysis (TGA) investigated the composition of the resulting composite nanospheres. Moreover, the magnetic testing experiment could give us a direct proof of the presence of Fe3O4 in magnetic hollow PMMA nanospheres. And the magnetic hollow PMMA nanospheres had a promising future in controlled drug delivery and targeted drug applications.
Co-reporter:Haitao Zhang;Zaihang Zheng;Hongyan Wang
Journal of Mathematical Chemistry 2010 Volume 48( Issue 3) pp:720-732
Publication Date(Web):2010 October
DOI:10.1007/s10910-010-9705-3
In order to quantify and predict the water resistance of membrane, a multi-scales association model was built up based on the Fick’s second law. Two water resistance indexes, balance time and seepage velocity, were put forward and calculated by the model for measuring the property of membrane water resistance. The association model linked macro-scale factors and micro-scale parameters together. The influence of macro-scale factors, environmental temperature and membrane thickness, and micro-scale parameters, water molecules diffusivity, membrane saturated water absorption rate and water escape concentration, were discussed. The properties of water resistances for two groups including 10 waterborne acrylate membranes samples were measured for validating the indexes calculated by the model. The well consistency between the results of calculations and experiments proved that the method of multi-scales association modeling for quantifying and predicting the membrane water resistance was feasible.
Co-reporter:Xuejun Cui, Shuangling Zhong, Jing Yan, Chunlei Wang, Haitao Zhang, Hongyan Wang
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2010 360(1–3) pp: 41-46
Publication Date(Web):
DOI:10.1016/j.colsurfa.2010.02.006
Co-reporter:Jing Yan;Xiaojie Miao;Weiqun Jin;Hongwei Liang;Junfeng Li ;Hongyan Wang
Polymer Engineering & Science 2010 Volume 50( Issue 9) pp:1713-1720
Publication Date(Web):
DOI:10.1002/pen.21692
Abstract
A technology of swelling and suspension copolymerization was conducted to graft styrene onto linear low-density polyethylene (LLDPE). The graft mechanism of styrene with LLDPE had been described by 1H NMR and IR. The mean particle diameter and size distribution of the products with different proportions of LLDPE to styrene monomer were calculated. The morphology and thermal behavior of copolymers were characterized by scanning electron microscopy and differential scanning calorimetry. The glass transition temperature of copolymers increased with the addition of LLDPE, which proved the existence of the polyethylene-g-polystyrene copolymer. The grafting efficiency and granulation rate of suspension copolymerization were investigated. It was found that the grafting efficiency increased and the granulation rate decreased with the addition of LLDPE. POLYM. ENG. SCI., 50:1713–1720, 2010. © 2010 Society of Plastics Engineers
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