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Effect of electrolytes on electrochemical properties of graphene sheet covered with polypyrrole thin layer

Progress in Natural Science:materials International 2011年第6期21卷 460-466页

作者： ya-meng cai~(1,2),zong-yi qin~1,long chen~2 1.state key laboratory for modification of chemical fibers and polymer materials, donghua university,shanghai 201620,china 2.College of Material Science and Engineering,donghua university,shanghai 201620,china state key laboratory for modification of chemical fibers Donghua University State Key Laboratory for Modification of and Polymer Materials Donghua University College of Material Science Donghua University College of Engineering Donghua University

Graphene sheet(GS) was successfully covered with a polypyrrole(PPy) thin layer through in situ chemical oxidative polymerization of pyrrole monomers in aqueous solution by using GS as a support material and ferric trichloride as an *** resulting nanocomposite was studied by field emission scanning electron microscopy(FE-SEM),Fourier transform infrared spectroscopy(FT-IR) and electrical measurements,including cyclic voltammetry(CV),galvanostatic charge/discharge experiment (GCD),and impedance spectroscopy(EIS).It has been found that the nanocomposite exhibited a typically curved and layer-like structure,and conformational change of PPy chains occurred due to the n-n stacking interaction between the graphitic structures in GS and aromatic rings of the PPy *** attention was paid to the effect of electrolytes on electrochemical properties of the nanocomposites,as expected,electrochemical performance was dependent on the nature of the electrolyte,and the neutral electrolytes containing alkali metal ions were found to be very suitable for GS/PPy *** with the pure PPy,the nanocomposite possessed larger specific capacitance and lower internal impedance,indicating that the nanocomposite can be a promising candidate as electrode material for supercapacitors.

关键词： nanocomposites graphene polypyrrole electrochemical property electrolyte

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Cellulose nanocrystals as green fillers to improve crystallization and hydrophilic property of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

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Progress in Natural Science:materials International 2011年第6期21卷 478-484页

作者： Hou-yong YU~(1,2),zong-yi qin~1,Zhe ZHOU~2 1.state key laboratory for modification of chemical fibers and polymer materials, donghua university,shanghai 201620,china 2.College of Material Science and Engineering,donghua university,shanghai 201620,china state key laboratory for modification of chemical fibers and polymer materials Donghua University Shanghai 201620 China College of Material Science and Engineering Donghua University Shanghai 201620 China

The green nanocomposites of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV) with various cellulose nanocrystals (CNCs) contents were prepared by solution casting *** effects of CNCs on the crystallization behavior,spherulitic morphology,crystal structure and hydrophilic property of PHBV were studied by differential scanning calorimeter(DSC),polarized optical microscope(POM),wide-angle X-ray diffraction(WAXD) and static water contact angle *** is found that the CNCs act as an effective nucleation agent for crystallization of PHBV,inducing an increase in the melt crystallization temperature of the nanocomposites.A study of the non-isothermal crystallization kinetics further illustrated that overall crystallization rate of PHBV in the nanocomposites was faster than that of neat PHBV,but exhibited a decrease in the crystallinity and the spherulite size of PHBV. Furthermore,the contact angle decreased from 60.1°for neat PHBV to 32.5°for the nanocomposites with 10%CNCs(mass fraction).

关键词： nanocomposites poly(3-hydroxybutyrate-co-3-hydroxyvalerate) cellulose nanocrystals crystallization behavior hydrophilic property

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Synthesis of core-shell acrylic-polyurethane hybrid latex as binder of aqueous pigment inks for digital inkjet printing

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Progress in Natural Science:materials International 2012年第1期22卷 71-78页

作者： Jingfang Zhang a,Xuefeng Li a,Xinhao Shi a,Mei Hua a,Xingping Zhou b,Xiaqin Wang a,a state key laboratory for modification of chemical fibers and polymer materials,donghua university,shanghai 201620,china b College of chemical Engineering and Biotechnology,donghua university,shanghai 201620,china state key laboratory for modification of chemical fibers and polymer materials Donghua University

Acrylic-polyurethane(PUA) hybrid aqueous emulsion with core-shell structure was prepared via semibatch emulsion copolymerization of the acrylate monomers(AC) in the presence of a commercial polyurethane dispersion as *** core-shell structure of the emulsion was observed by *** particle size and distribution of the emulsion was found to vary drastically with the core-shell *** thermal response properties of emulsion films were measured by DSC,and the results indicated the good compatibility between PA and PU moieties in PUA *** chemical structures of emulsion films were studied by FTIR,and the surface properties were tested by contact angle *** results supported the idea that the surface of the cast films was rich in polyurethane *** water resistance of the cast films became better by increasing the AC *** rheological properties of the latex and its utilization as a binder for aqueous pigment inks of digital inkjet printing were thoroughly investigated,indicating that the prepared hybrid emulsion could be used safely for aqueous pigment inks of digital ink jet printing.

关键词： Core-shell structure PUA hybrid emulsion Latex ink binder Rheological properties

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Fabrication of well-dispersive yttrium-stabilized cubic zirconia nanoparticles via vapor phase hydrolysis

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Progress in Natural Science:materials International 2012年第1期22卷 15-20页

作者： Fuzhi Shi a,yaogang Li b,Hongzhi Wang a,qinghong Zhang b a state key laboratory for modification of chemical fibers and polymer materials,donghua university,shanghai 201620,china b Engineering Research Centre of Advanced Glasses Manufacturing Technology,donghua university,shanghai 201620,china state key laboratory for modification of chemical fibers and polymer materials Donghua University Shanghai 201620 China Engineering Research Centre of Advanced Glasses Manufacturing Technology Donghua University Shanghai 201620 China

The well-dispersive yttrium-stabilized cubic zirconia nanoparticles were fabricated via vapor phase hydrolysis process,and the as-synthesized cubic zirconia nanoparticles were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),highresolution electron microscopy(HRTEM) and N 2 adsorption-desorption isotherm *** results of XRD indicated that the pure cubic zirconia nanocrystals were obtained with 8 mol% yttrium atoms *** SEM and TEM observation showed the yttrium-stabilized cubic zirconia nanoparticles(8 mol% yttrium) were dispersive well,with an average crystallite size of 5 *** zirconia coatings were fabricated via the layer by layer(LbL) assembly using poly(allylamine hydrochloride) as polyelectrolyte and cubic zirconia nanoparticles as building blocks in order to illustrate its good *** quartz substrate coated on both sides with 10 layers of yttrium-stabilized cubic zirconia nanoparticles exhibited transmittance as high as 92.3%,which was decreased only one percent compared with bare quartz ***,the stable super-hydrophilic wetting property of the coating was obtained after a critical number of layers(10 layers) deposited onto the surface of quartz substrate,due to its porous structures.

关键词： Cubic zirconia Yttrium-stabilized Vapor phase hydrolysis Layer by layer

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Size-controlled and large-scale synthesis of organic-soluble Ag nanocrystals in water and their formation mechanism

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Progress in Natural Science:materials International 2011年第6期21卷 447-454页

作者： Yu-yuan SHI,Bin SUN,Zhe ZHOU,Yong-tao WU,Mei-fang ZHU state key laboratory for modification of chemical fibers and polymer materials, College of Material Science and Engineering,donghua university,shanghai 201620,china state key laboratory for modification of chemical fibers State Key Laboratory for Modification of Polymer Materials College of Material Science Donghua University College of Engineering Donghua University

Organic-soluble Ag nanocrystals(NCs) with tunable sizes in the range from 5.4 to 22.1 nm were synthesized by a facile, reproducible and easily scaled up route using water as solvent in the presence of oleic acid and an *** synthetic Ag NCs exhibits excellent hydrophobicity and can be well re-dispersed in various non- or weak-polar *** tunable sizes of the Ag NCs were achieved by simply adjusting the initial precursor ***-scale synthesis of the Ag NCs was realized at a high AgNO3concentration(0.4 mol/L).As much as 16.2 g highly uniform organic-soluble Ag NCs with 5 nm average diameter can be readily synthesized at low cost in a single reaction only using 400 mL water as solvent,which is adaptable to the industrial scale *** structure of the obtained Ag NCs was investigated in detail by X-ray diffractometry,transmission electron microscopy,Fourier transform infrared and thermal gravimetric analysis *** results reveal that the surface of the organic-soluble Ag NCs is coated with the monolayer surfactants consisting of oleic acid and the *** addition,on the basis of the sufficient evidences,a proposed mechanism based on the "bilayer surfactant-controlled reaction" successfully demonstrates the formation of high quality organic-soluble Ag NCs in the aqueous solution.

关键词： organic-soluble Ag nanocrystals large-scale size-controlled synthesis formation mechanism

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Solvothermal synthesis of Co1-xNixFe2O4 nanoparticles and its application in ammonia vapors detection

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Progress in Natural Science:materials International 2012年第1期22卷 53-58页

作者： ya Tang a,b,Xinwei Wang a,qinghong Zhang b,yaogang Li a,n,Hongzhi Wang b a state key laboratory for modification of chemical fibers and polymer materials,donghua university,shanghai 201620,People’s Republic of china b College of materials Science and Engineering,donghua university,shanghai 201620,People’s Republic of china state key laboratory for modification of chemical fibers and polymer materials Donghua University Shanghai 201620 People's Republic of China College of materials Science and Engineering Donghua University Shanghai 201620 People's Republic of China

Magnetic Co1-xNixFe2O4 nanoparticles(NPs) were successfully synthesized via a solvothermal method using ethylene glycol as *** samples were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),vibrating sample magnetometry(VSM) and gas sensing *** experimental results showed that the magnetic Co1-xNixFe2O4 NPs were composed of single phase spinel structure and the average crystallite size in the NPs is between 5.8 and 9.8 nm;the NPs are spherical with an average particle size of about 40-90 nm;the saturation magnetization(Ms) of the Co1-xNixFe2O4 NPs decreased linearly as the contents of Ni2t increased;and the as-prepared Co1-xNixFe2O4 NPs have a higher selectivity toward ammonia vapors and the Co0.8Ni0.2Fe2O4 has the best gas sensitivity of Co1-xNixFe2O4(0rxr1) NPs at working voltage of 8 V.

关键词： Magnetic materials Nanostructures chemical synthesis Magnetic properties Gas sensing properties

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La2O3-Al2O3-SiO2 glass-infiltrated 3Y-TZP all-ceramic composite for the dental restorative application

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Progress in Natural Science:materials International 2012年第3期22卷 224-230页

作者： Shenyong Shi a, qinghong Zhang b, Hongzhi Wang a, yaogang Li b a state key laboratory for modification of chemical fibers and polymer materials, donghua university, shanghai 201620, PR china b Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, donghua university, shanghai 201620, PR china state key laboratory for Modiﬁcation of chemical fibers and polymer materials Donghua University Shanghai 201620 PR China Engineering Research Center of Advanced Glasses Manufacturing Technology MOE Donghua University Shanghai 201620 PR China

The 3 mol% yttria stabilized tetragonal zirconia polycrystals (3Y-TZP) powder had three particle size distributions, while the fine one was lower than 100 nm. The 3Y-TZP compact was prepared by dry-pressing under pressures ranged from 10 to 30 MPa and then presintered at 1250 ℃ for 2 h. The matrix dry-pressed under the pressure of 20 MPa had a porosity of 16.7% and could be easily processed by computer aided design and computer aided manufacturing (CAD/ CAM), and which had been infiltrated by the La2O3-Al2O3-SiO2 glass at 1200 ℃ for 4 h. The flexural strength and fracture toughness of the composite were 710.7 MPa and 6.51 MPa m1/2, respectively. The low shrinkage (0.3%) of the composite can satisfy the net-shape fabrication standard. XRD results illustrated that zirconia in the La2O3-Al2O3-SiO2 glass-infiltrated 3Y-TZP all-ceramic composite was mainly in the tetragonal phase. SEM and EDS results indicated that the pores of the matrix were almost filled by the La2O3-Al2O3-SiO2 glass.

关键词： 3Y-TZP Glass-infiltrated Composite Mechanical properties

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The Properties of Native Silk Fibroin (SF) Solution/Gel from Bombyx mori Silkworms during the Full Fifth Instar Larval Stage

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Journal of Wuhan university of Technology(materials Science) 2011年第2期26卷 263-269页

作者：王洪 key laboratory of Textile Science & Technology Ministry of EducationDonghua University

The properties of native silk fibroin （SF） solution in the gland of silkworms during the full fifth instar larval stage were examined in an attempt to elucidate the mechanism of natural silk spinning in the *** flow and gelation behavior,birefringence phenomenon,rheological properties,specific viscosity and conformation of SF solutions from the gland of silkworms were measured by polarized light microscope,HAKKE rheometer,Ubbelohde viscometer and Solid-state 13C NMR,*** comparing their properties with regenerated SF solutions from natural silk fibers,it is believed that there exists a progressive maturation process favorable to spin silk fibers with excellent properties from native SF solution and a weak bonded and highly oriented SF gel network with SF molecules partly extended in α-helix conformation is formed in the middle section of the gland of *** suggests that a biomimetic maturation process for making spinnable solution might be necessary for artificial silk fiber spinning in order to obtain improved fiber properties.

关键词： silk fibre spin viscosity sol/gel

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Synthesis of dental resins using diatomite and nano-sized SiO2 and TiO2

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Progress in Natural Science:materials International 2012年第2期22卷 94-99页

作者： Xiaoli Miao a,Meifang Zhu a,yaogang Li b,qinghong Zhang b,Hongzhi Wang a a state key laboratory for modification of chemical fibers and polymer materials,donghua university,shanghai 201620,china b Engineering Research Center of Advanced Glasses Manufacturing Technology,MOE,donghua university,shanghai 201620,china state key laboratory for modification of chemical fibers and polymer materials Donghua University Shanghai 201620 China Engineering Research Center of Advanced Glasses Manufacturing Technology MOE Donghua University Shanghai 201620 China

The mechanical properties of dental composites were improved by porous diatomite and nano-sized silica(OX-50)used as *** resin composites,filled with silanized OX-50 and silanized diatomite(40:60 wt/wt),presented the best flexural strength(133.1 MPa),elastic modulus(9.5 GPa)and Vickers microhardness(104.0 HV).Besides these,TiO2 nanoparticles were introduced to tune the dental resin composites colours which were valued by the CIE-Lab *** colour parameters(L*,a*,b*)showed that the colour changes of resin composites could be perceived obviously,when 300-400 nm TiO2 particles were introduced as *** resin composite,filled with 0.5 wt%TiO2,exhibited both clear discolouration(DE * =3.22)and high mechanical *** scanning electron microscope(SEM)equipped with an energy dispersive X-ray(EDX),the titanium elemental mapping results indicated that the TiO2 particles were distributed evenly in the prepared dental composites.

关键词： Dental resin composites TiO2 Diatomite Colour change Optical properties

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Facile one-pot sonochemical synthesis of hydrophilic ultrasmall LaF3:Ce,Tb nanoparticles with green luminescence

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Progress in Natural Science:materials International 2012年第5期22卷 488-492页

作者： Lisha Zhang a,Wei Li b,Xianghua Hu b,yanlin Peng b,Junqing Hu b,Xingyu Kuang b,Linlin Song b,Zhigang chen b a state key laboratory for modification of chemical fibers and polymer materials,College of Environmental Science and Engineering,donghua university,shanghai 201620,china b College of materials Science and Engineering,donghua university,shanghai 201620,china state key laboratory for modification of chemical fibers and polymer materials College of Environmental Science and Engineering Donghua University Shanghai 201620 China College of materials Science and Engineering Donghua University Shanghai 201620 China

Rare earth nanoparticles(RENPs) have great superiority as luminescent materials for broad applications,and a prerequisite for most of their application is to obtain hydrophilic RENPs with efficient luminescence and small diameter(chemical route with tetraethylene glycol as the solvent and tetrafluoroborate-based ionic liquid as the fluorine source for the synthesis of LaF3:Ce,Tb as the model of ***3:Ce,Tb nanoparticles with the diameter of about 6 nm were prepared in a very short ultrasound time(10min).Fourier transform infrared spectrum reveals the presence of tetraethylene glycol ligands on their surface,which confers high solubility of LaF3:Ce,Tb nanoparticles in *** 254 nm UV excitation,the aqueous dispersion of LaF3:Ce,Tb nanoparticles exhibits strong green emission with luminescent quantum yield of 50%.This work probably contributes to not only the fundamental research of shape-controlled LaF3:Ce,Tb nanoparticles but also new methods of producing other RENPs for broad applications.

关键词： Sonochemical synthesis LaF3:Ce,Tb Nanoparticles Luminescence

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