15 July 2012, Volume 43 Issue 13
    

  • Select all
    |
    综述
  • Research progress of TiO2 co-doped with Rare earth and N ions
    XU LiUjun;YAN Ningning;LIU Qingju
    . 2012, 43(13): 1665-1668.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Titanium dioxide is a very important photocatalyst. By means of ion doping, the optical absorption range and photocatalytic activity can be improved effectively. The modified mechanism of TiO2 co-doped with rare earth and N ions was introduced, and the effects of ions doping on the crystal and electrical structure were analyzed. The problems and the development prospects of TiO2 co-doped with rare earth and N ions were also summarized.
    • 研究与开发
  • Simple and Effective Preparation and Characterization of Nitrogen-doped TiO2 Nanocrystallites and Their Visible Light Activities
    CAI Heshan;LIU Guoguang;LI Xiaoxia
    . 2012, 43(13): 1669-1672.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Nitrogen-doped TiO2 nano-sized photocatalysts were prepared by a simple acid-catalyzed sol-gel method using urea as nitrogen raw material. The photocatalytic decomposition of methyl orange in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities under visible light irradiation. The prepared Nitrogen-doped TiO2 samples on the crystallite sizes, cystal pattern, suface composition and optical absorption property were characterized by means of the techniques such as XRD, XPS and UV-Vis DRS spectra. The results showed that doping nitrogen in TiO2 reduces its band gap energy,which makes Nitrogen-doped TiO2 nanocrystallites have a stronger visible light absorption from 400 nm to 530 nm.Also they have high visible light photocatalytic activities in the degradation of methyl orange. The crystallite size of single anatase TiO1.9904N0.0096 calcined at 400 ℃ was 14.94 nm and exhibited the highest visible light photocatalytic activity.
  • Highly Selective Fluorescence Detection of Pb2+ by the derivative of 2-Furaldehyde- Indolizine
    LIU Lei;HAN Qiaorong;JIANG Yuliang
    . 2012, 43(13): 1673-1674.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The compound 5 of 2-furaldehyde-indolizine was synthesized. Its structure was characterized by using IR, Uv and 1HNMR. The fluorescent and the influence of different transitional metal ions such as Co2+、Ca2+、Zn2+、Cu2+、K+、Ni2+、Mn2+、Pb2+ on thiscompound were studied systematically. The results showed this compound exhibited a highly selective fluorescence quenching effect by Pb2+ ions, while other metal ions almost no quenching happened. The UV absorption spectra increased with the addition of Pb2+ into the solution of 2-furaldehyde-indolizine suggesting that chemical reaction occurred between the Pb2+ and this compound. This compound is promising to be the probe for the Pb2+ .
  • Research on mixed supercapacitor with large capacity
    WANG Kai;ZHANG Li;LI Chen
    . 2012, 43(13): 1675-1677.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Through the optimized combination of aluminum electrolytic capacitors anode and electrochemical capacitors cathode, using Ta/Ta2O5 as the anode, activated carbon as the cathode, we developed a work unit for 100 V voltage of the hybrid supercapacitor. Compared with the usual electrochemical capacitor working voltage, the capacitance had improved. The electrical performance test shows that it has high energy storage density and rapid charging and discharging ability, electrochemical spectrum impedance (EIS) analysis shows that it has good impedance characteristics and the frequency characteristics.
  • The Experimental Study of Dynamic Mechanical Property of Ni-Ti Shape Memory Alloy
    ZOU Guangping;LI Yulei;WANG Dandan
    . 2012, 43(13): 1678-1681.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Continuous dynamic impact experiment is carried out to the Ni-Ti Shape Memory Alloy of austenite state by SHPB experimental facilities, and the impact energy is kept the same every impact, the results show that with the increasing of the impact time, not only the initial stress for martensitic transformation increases because of successive strengthen effect, but also the deformation recovery rate after unloading increases at the same time, but the stress-rate decreases with the impact time.
  • Effect of process parameters on purity and particle size of boron powder prepared by combustion synthesis
    LA Peiqing;ZHOU Maoxiong;JU Qian
    . 2012, 43(13): 1682-1687.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    B2O3 and Mg powders were used as raw materials and reductant respectively．The boron powders were obtained by combustion synthesis，The effects of different process parameters on products were systematically studied，Such as reactant mass、material proportion and the pressure of tablets. Through SEM and EDS these samples were studied. The results show that the minimum particle size and the supreme purity of product is prepared when the reactant amount is 100g. The same samples are prepared when the reaction ratio is 1. With the pressure of 5 MPa, the particle size is minimum and with the pressure of 10 MPa, the purity is supreme.
  • The Preparation and Properties of Nickel-coated Carbon Fiber by MOCVD Process
    LI Yi;NIE Junhui;LI Nan
    . 2012, 43(13): 1688-1691.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A dense and smooth nickel-coated film on the surface of carbon fiber was obtained by using Metal Organic Chemical Vapor Deposition (MOCVD) process with carbonyl nickel as precursor. The as-received coating film was pure nickel without any impurities. The influence of deposition temperature on nickel-coated film was investigated and the results showed that the ideal nickel-coated film could be obtained at temperature of 270℃.The measurement of adhesive force of nickel-coated film with carbon fiber was performed by thermal-cold cycling testing, the coating film exfoliation didn’t appear until four times of thermal-cold cycling. The fracture strength of nickel-coated film carbon fiber increased by 34.9 percents compared to that of original carbon fiber. Differential thermal analysis testing indicated that the coating film could enhance the property of oxidation resistant of carbon fiber.
  • Luminescent Properties of KNaCa2(PO4)2:Dy3+ Phosphor for White LED
    YANG Zhiping;SONG Yanchun;HAN Yue
    . 2012, 43(13): 1692-1695.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Phosphor KNaCa2(PO4)2:Dy3+ was synthesized by high temperature solid-state reaction and its luminescence properties were investigated. The excitation and emission spectra of KNaCa2(PO4)2:Dy3+ phosphor were measured by fluorospectrophotometer at room temperature. The excitation bands were all extended from 300nm to 500nm, of which the strongest peak was located at 385nm. Phosphor can be excited effectively by InGaN chips in the range of 380-410nm and two major emission peaks locate at 485nm and 620nm, which correspond to the 4F9/2-6H15/2 and 4F9/2-6H13/2 typical transition of Dy3+, respectively. White light could be obtained by mixing the two emission colors, blue (485nm) and yellow (577nm), in the single host. The luminescent intensity of KNaCa2-x(PO4)2:xDy3+ powder changed along with different concentrations of Dy3+ ions, and the optimum concentration of Dy3+ in KNaCa2(PO4)2 is x(Dy)=0.04mol. It was confirmed that the mechanism of concentration is electric dipole-dipole interaction. Color coordinates were measured and marked under different Dy3+ concentrations, and all of the samples show the white light emission. The experimental results show that the KNaCa2(PO4)2:Dy3+ is a single host phosphor with superior properties for white light emitting diodes.
  • Sintering sysstem on the properties and microstructure of mullite-fiber-reniforced porous glass matrix composites
    GAO Shuya;LV Lei;GUO Xiaochen
    . 2012, 43(13): 1696-1699.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: Using mullite-fiber as reniforcement, the mullite-fiber-reniforced porous glass matrix composites were prepared by solid-phase sintering. The effect of sintering temperature and holding time on the microstructure and properties of mullite-fiber-reniforced porous glass matrix composites were researched in detail. The structures and fracture surface morphologies of the composites were characterized by XRD and SEM analyses, the density were tested by the Archimedean method, The flexural property of the composites were tested by a universal testing machine. The results show that with the foaming temperature or holding time increased, the aperture size of porous glass is increased too, but it will form interconnect hole when the foaming temperature is too high or holding time is too long; The flexural strength and the density reduce with the increase of foaming temperature and holding time; The maximum specific strength is 0.013 m2/s2 when the foaming temperature is 840℃ and the holding time is 20 min.
  • V2O5 promoted the synthesis of potassium titanate whiskers
    NIU Fei;LIU Zili;ZHANG Jianjie
    . 2012, 43(13): 1700-1703.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    potassium titanate whiskers is a kind of chain tunnel structure of new material,which has excellent physical and mechanical properties and stable chemical properties.At present，the synthesis of potassium titanate by KDC method required high temperature and whiskers had small ratio of length to diameter.However,in this paper, KDC method was improved that V2O5 was additive to lower calcination temperature and increased ratio of length to diameter which could be reached 22. It was found that V2O5 could lower calcination temperature by TG-DSC curve. Simultaneously suitable?calcinations temperature,time and amounts of V2O5 were identified by XRD and SEM. The results showed that when calcination temperature was 800℃、calcination?time 5h、2% amouts of V2O5,synthesizing potassium titanate whiskers had 22 average ratio of length to diameter、good crystal and uniform Morphology.
  • Preparation and magnetic properties of FePt continous and granular thin films
    WANG Jiansheng;PEI Wenli;YANG Bo
    . 2012, 43(13): 1704-1707.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A series of FePt thin films with different thicknesses under different Ar gas pressures were prepared by DC magneton sputtering on glass substrates. The effects of sputtering pressure and film thickness on FePt microstructure were investigated by TEM. The effects of sputtering pressure and film thickness on magnetic properties were also determined by VSM. The results show that, the sputtering pressure and film thickness have great influences on morphology and grain size of as-deposited FePt thin films. With increasing the sputtering pressure, the grain size decreases, together with the continuous film changing into granular film. As the film thickness increases, the grain size becomes larger and the film morphology changes from granular film into continuous one. By controlling the sputtering pressure, FePt granular films with island structure have been successfully prepared. Sputtering pressure and film thickness have great effects on magnetic properties of annealed FePt thin films. As for annealed film, with the increase of sputtering pressure, the nucleation field changes from the positive into the negative, together with an increase in the squareness ratio of magnetic loop. With the increase of film thickness, disorder-order transition of the FePt thin films become more complete.
  • Investigation into influence of CuO additions on properties of gadolinia-doped ceria
    LIU Dongran;WANG Ling;DAI Lei
    . 2012, 43(13): 1708-1711.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Ce0.8Gd0.2O1.9 with CuO sintering aid was prepared by traditional solid state reaction method. The influence of CuO additions on density, phase composition, microstructure and electrical properties of CGO were investigated by XRD, SEM and EIS. The results show that the sample density increases with temperature increasing and at 1300℃ the sample density reaches the biggest value; When over 1300℃, sample seem to be over sintered. Compared with pure CGO, the sintering temperature of CGO sample with addition of CuO reduces by 300℃. The XRD results indicate that the CGO was still remained cubic fluorite structure. AC impedance spectroscopy showed that when added amount of CuO is 1mol%, the samples sintered at 1300℃ has the highest conductivity. So CuO addition not only reduces the sintering temperature but also improves the electrical conductivity of CGO samples. CuO is an effective sintering aid.
  • Adsorption Properties of Salmon Sperm DNA on Organic and Inorganic Modified Montmorillonite
    TANG Yinin;WU Pingxiao;HOU Yakun
    . 2012, 43(13): 1712-1717.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: Poly hydroxyl iron and aluminum was used as inorganic pillaring reagent to prepare inorganic montmorillonite(MMT). At the same time, organic clays pillared by HTDMA and SDS were prepared. These clays were analyzed by X-ray diffraction (XRD)， infrared spectrum (IR)， specific surface area analyzer(BET)and Zeta potential instrument. We compared the adsorptive performance of Salmon Sperm DNA on MMT of different structure for the first time. The values of equilibrium adsorbance were in order of HTDM-MMT> MMT>SDS-MMT>Fe/Al-MMT. After organic modification, HTDMA promote DNA adsorption, with the adsorbance of 61.04μg ?mg-1.However, as a result of being carpeted with SDS on external surface, the SDS-MMT adsorbed less DNA with the adsorbance of 26.88μg ?mg-1. When pH values were 5.0～9.0, the amounts of DNA adsorption on organic modified MMT declined far less than original MMT with the increase of pH value. The kinetics of adsorption indicated that the main step which controlled DNA adsorption on modified MMT is chemical adsorption. The differences of desorption on organic and inorganic modified MMT are very significant while the DNA adsorbed was desorbed with NaOAc and NaH2PO4 solution. These results showed that the structure, the electronegativity and the characteristics of the surface were the key factors that affect DNA adsorption on differently modified MMT.
  • PS/TiO2 hybrid core–?shell composite microspheres preparation by no soap emulsion polymerization
    LI Haidong;GAO Wenjie;CHENG Fengmei
    . 2012, 43(13): 1718-1721.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    This article through no soap emulsion polymerization preparation polystyrene microspheres. Polystyrene microspheres by sulphonate absorption moisture, Used TBOT as a precursor reaction in ethanol, Maked sulphonated styrene microspheres surface was covered with TiO2, Obtained the organic-inorganic hybridization microspheres. In obtained hybridization microspheres surface stem grafting tangible functional group, Used no soap emulsion polymerization let gather methyl methacrylate (MMA) polymerization to microspheres surface, Gotten core-shell -shell hybrid microspheres.
  • Preparation and Characterization of nanometer Nickel
    WU Xiaoqiang;TANG Yongjian;CHEN Shanjun
    . 2012, 43(13): 1722-1725.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Nickel nanocrystal powder had been synthesized adopted flow-levitation method. The analysis indicated that the grain size of the powder is mainly composed of nickel and shape of the ball. The grain size of nickel powder is studied by means of TEM and XRD. Further research found that Nanoparticles shape is obvious influenced by load voltage, cooling medium, and circulation-air. The result of XRD and TEM make known, the best choice of preparation of nickel powder is using medium of Ar, the speed of gas is 1.4stere peer hour, and the voltage is 5.5 kilovolt.
  • Quantification and Comparison of Immobilized Fibronectin by MicroBCA and QCM Method on Titanium-film Surface
    ZHANG Huiting;ZHOU Chao;LUO Liping
    . 2012, 43(13): 1726-1729.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: The aim of this study was to assess the feasibility of MicroBCA method in quantification of fibronectin immobilized on solid material surfaces. In this study, Titanium films with favourable physiochemical performance and biocompatibility were firstly deposited onto quartz glass surfaces via unbalanced magnetron sputtering system. Then, fibronectin was covalently immobilized onto coated titanium film surface. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to determine the chemical composition of the surfaces at various stages of surface modification to verify the protein was successfully immobilized. MicroBCA protein assay method was used to determine the amount of fibronectin on sample surfaces. As comparison, the mass of immobilized protein was also detected by quartz crystal microbalance (QCM) technical. The FTIR and XPS results showed that fibronectin was successfully immobilized onto the coated titanium film surface. The comparison results from MicroBCA and QCM measurements were consistent tendency. And the surface density of immobilized fibronectin on sample surface was approximately 767-789 ng/cm2.
  • Preparation and characterization of biocoating on magnesium alloy surface by one-step hydrothermal treatment
    ZHANG Haixiao;CHEN Funan;WANG Shaoyin
    . 2012, 43(13): 1730-1732.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Magnesium alloy is potentially a desirable metallic material for degradable orthopedic implants if its corrosion rate can be reduced by surface modification. To achieve this aim, a protective and biocompatible coating was directly prepared on AZ91D magnesium alloy surface by the low-cost and simple one-step hydrothermal (HT) strategy in composition-simple sodium carbonate（SC）solution in this paper for the first time. Phase structures, surface morphologies and corrosion resistant properties of the coating were identified by X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical measuring and long-term immersion pH test in c-SBF, respectively. This paper provides references on a new surface modification method of magnesium alloy implants.
  • Synthesis of Reactive Phosphate and its Effect on the Mechanical and Flame Retardant Properties of Thermoplastic Polyurethane Elastomer
    ZHANG Tong;ZHENG Yuying;CHEN Dexian
    . 2012, 43(13): 1733-1736.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A dihydroxyl phosphate called butyl bis(4-hydroxybutyl) phosphate was synthesized. The mechanical and flame retardant properties of TPU were investigated by different additive amount of BBHP. It was found that with the increasing of BBHP, the mechanical strength performance of TPU decreased, but the flame retardant of TPU improved. When the additive amount of BBHP came up to 12%, the tear strength of TPU was up to maximum. The oxygen index of TPU reached more than 27 with the adding quantity of BBHP from 10% to 12%. At the same time, the mechanical properties and color can satisfy the requirement of TPU.
  • Electrochemical Surface-Hydrogenation and Characterization of Nitrogen-doped N-Type Nanocrystalline Diamond Film
    WANG Dong;XIONG Ying;WANG Bing
    . 2012, 43(13): 1737-1740.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, based on its unique structural feature, nitrogen-doped N-type nanocrystalline diamond thin film was successfully hydrogenated in surface via a mild electrochemical cathode polarization. Surface structure and micro-structure of nitrogen-doped N-type nanocrystalline diamond thin film before and after the treatment of electrochemical cathode polarization were carefully investigated by X-ray photoelectron spectrum (XPS), Contact angle measurement,capacitance-voltage analysis, Raman spectrum and scanning electron microscopy (SEM). These results suggested that this electrochemical cathode polarization technique could not only obtain hydrogen-terminated surface, but also had not significant effect on micro-structure of diamond thin film, especially on sp2-hybridized carbon located in grain boundary, indicating that this technique is an effective and undamaged surface-hydrogenation method for nitrogen-doped N-type nanocrystalline diamond thin film.
  • Study on heat-resistant and wear-resistant Al2O3 coating of steel pipes inwall produced by SHS-gravitational process
    GAO Jiacheng;LI Ning
    . 2012, 43(13): 1741-1744.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The Al2O3 coating of steel pipes inwall was produced by SHS- gravitational process, it was tested of mechanical properties and thermal shock resistance as well as corrosion resistance. The effects of pipe diameter and stuffing density as well as different content of SiO2 and CrO3 additive on structure and properties of the pipes have been investigatied. It is found that the main phase of coating is α-Al2O3+ FeA12O4 and the SiO2 or CrO3 additives don't change the main phase composition. Molten metal Fe formed a transition layer between the steel pipe and ceramic layer during the reacting. When the additives content was 2% SiO2 +6% CrO3，the ceramic coating has smallest porosity and highest hardness as well as best thermal shock resistance, its corrosion resistance is also good, so it shows good comprehensive performance. In this test conditions, when the diameter is 25mm and the stuffing density is 1.5g/cm3, the hardness of coating can reach 1917HV, its porosity is 9.0%.
  • Free-radical initiated grafting zwitterionic polymer onto PVDF membrane
    LI Jianhua;LI Mizi;ZHANG Qiqing
    . 2012, 43(13): 1748-1751.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The original PVDF membrane containing AIBN was prepared because that the AIBN and PVDF can be all dissolved in strong polar solvent. In facile condition, the free radical generating from heating the AIBN can initiate grafting polymerization of zwitterionic polymer PSBMA onto PVDF membrane. The chemical composition of the membrane surface was characterized by Attenuated total re?ectance/Fourier transform infrared spectroscopy (FTIR-ATR). The field emitting scanning electronic microscopy was conducted to observe the membrane morphology. The hydrophilicity of PVDF membranes after grafting PSBMA has improved significantly from the contact angle results. the contact angle of PVDF-g-PSBMA membrane was declined to 62° with the grafted yield of 13.8%. By BSA static absorbed experiment, the anti-fouling properties of modified membrane have enhanced remarkable compared to original membrane.
  • Modification of Calcium alginate fibers with aluminum sulfate solution
    ZHANG Chuanjie;WANG Huaifang;XIONG Wei
    . 2012, 43(13): 1752-1755.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Calcium alginate fibers (CAF) were immersed into aluminum sulfate aqueous solution in order to improve salt resistance and dyeing properties of CAF. The optimum conditions for modification of CAF are as following: concentration of aluminum sulfate is 15wt.%, reaction temperature is 45 ℃ and reaction time is 40 min. Under these conditions, the breaking strength of modified calcium alginate fiber (MCAF) is 2.94 cN.dtex-1 which is 11% higher than that of CAF. The structure of both CAF and MCAF was characterized by FTIR and XRD. During modification process, carboxyl groups react with hydroxyl groups involved in calcium alginates fibers’ macromolecular structure to form ester compounds. Meanwhile, aluminum ions in the solution exchange with sodium ions contained in calcium alginate fibers’ macromolecular structure to form a three dimensional network configuration with alginate macromolecular which is different from the “egg-box” structure of the compound containing calcium ions and alginate macromolecular. The results of XRD show that crystal structure of MCAF is changed and crystallinity of MCAF has increased with the comparision of unmodified calcium alginate fibers. However, crystallinity of MCAF slightly decreases with the increase of temperature and concentration of aluminum sulfate aqueous solution. The water absorbability of MCAF decreases compare with CAF, especially for solution A that is used to imitate the wound exudates. The water absorbability of CAF is 13.1 in solution A, but that of MCAF declines to 1.28. However, the water absorbability of MCAF is still much better than that of cotton fibers. The salt resistance of MCAF is higher than that of unmodified calcium alginate fibers and moreover they will not gelatinize in physiological salt solution. Even so, the breaking strength of MCAF decreases after treating in the salt solution. The higher lever concentration and temperature of salt solution reaches, the more serious damage to MCAF happens. The K/S value of dyed MCAF is about 4.5, which is 37.5 times higher than that of dyed CAF. Moreover, the color fastness to washing of dyed MCAF is above grade 4.
  • Effect of Different Seeds on KDP Crystal Quality
    SUN Yun;WANG Shenglai;GU Qingtian
    . 2012, 43(13): 1756-1758.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: KDP crystals were grown by the traditional temperature lowing method with Z-plate seed and cap-seed, respectively. The crystal properties, such as high-resolution X-ray diffractometry, optical homogeneity, extinction radio were determined in detail. The experiment show that KDP crystals grown with cap-seed had better crystal quality.
  • Fabrication and Characterization of Ternary Compound PMnN-PZT Thin Films on Silicon Substrates
    ZHANG Tao;ZHANG Shuyi;LI Min
    . 2012, 43(13): 1759-1761.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The ternary compound ferroelectric thin films, 6% Pb(Mn1/3, Nb2/3)O3- 94%Pb（Zr0.52, Ti0.48）O3, were deposited on the Silicon substrates by the magnetron sputtering method, and the quench method was adopted for the post heat treatment for the perovskite phase. Besides, the non-doped PZT(52/48) thin films were also fabricated for comparisons with the same sputtering mehod. The X-ray diffraction was used to characterize the crystal structures of thin films, and the Sawyer Tower circuit was used to measure the ferroelectricity, and the laser vibration measurement system was used to measure the transverse piezoelectric coefficient of thin films. The results show that the PMnN-PZT thin films own perovskite structures, and the remnant polarization , the saturation polarization and the coercive electric field , and the transverse piezoelectric coefficient , which identifies that the PMnN-PZT thin films own excellent ferroelectricity and piezoelectricity.
  • Preparation and performance study of chitosan microspheres loaded solid dispersion
    CHEN Liyuan;DANG Qifeng;LIU Chengsheng
    . 2012, 43(13): 1762-1765.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In the present work, four kinds of chitosan-based microspheres with different molecular weight of chitosan were prepared by emulsion-chemical crosslinking method. The characterizations of the microspheres were investigated regarding mean particle size, swelling ratio,drug-loading efficiency, encapsulation efficiency and performance of slow-release. The results indicated that the microspheres prepared with 240 kDa of chitosan had higher drug-loading efficiency, higher encapsulation efficiency and more slowly released speed than the other microspheres. The chitosan-solid dispersion microspheres prepared with 240 kDa of chitosan increased the solubility of ibuprofen and decreased the speed of drug release. The results revealed that the chitosan-solid dispersion microspheres had potential applications in drug release systems.
  • Preparation and Properties of Anionic Waterbone Polyurethane
    GONG Mei;ZHANG Li;HUANG Di
    . 2012, 43(13): 1766-1769.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Based on polyether (PTMG1000), toluene-diisocyanate (TDI) and dimethoxy acid (DMPA), a waterbone polyurethane emulsion was synthesized by self-emulsion method.The structure and properties of the sample were investigated by ATR-IR,TG,TEM and mechanical test.The results revealed that urea linkage was formed by the reaction of isocyanates with hydroxyl; the samples synthesized had high thermal stability and a uniform distribution of particle size was achieved in waterbone polyurethane emusion. It also found that the waterbone polyurethane had a good shape memory function. Its cytotoxicity was also tested and the result showed that it had good cytocompatibility.
  • Effects of oxidative modification of carbon surface on the adsorption of nitrogen compounds in model fuel
    WEN Jie;SUN Wenjing;YANG Wen
    . 2012, 43(13): 1770-1773.
    Abstract ( ) Download PDF ( ) Knowledge map Save
  • Synthesis and Properties of Banana-shaped Liquid Crystalline Compounds with terminal Nitryl Groups
    YAO Danshu;WANG Na;HE Xiaozhi
    . 2012, 43(13): 1774-1777.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A series of novel banana-shaped liquid crystals M1~M4 based on isophthalic acid or resorcinal as a core and nitryl as terminal groups was synthesized by aromatic esterification. Their chemical structures were confirmed by FTIR and 1HNMR spectra, their mesomorphic properties and phase behavior were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and thermograrimetric analyzer (TG) measurements. The results showed that M1~M4 were thermotropic liquid crystals. In mesomorphic state, they displayed dendritic, mosaic, fan-shaped, droplet and schlieren texture severally. The mesophase range was 32.9～57.2℃ (except M1) during heating, while it was 28.4～96.5℃ during cooling. With increasing rigidity of M1~M4, their tm、ti、tic improved obviously. The temperatures when 5% weight loss occurred were higher than 285℃, which revealed that the synthesized banana-shaped liquid crystals M1~M4 had a high thermal stability.
  • Microstructure and Growth Mechanism of SiC Whiskers Synthesized by Using Different Raw Materials
    ZHANG Junzhan;ZHANG Ying;JIANG Mingxue
    . 2012, 43(13): 1782-1785.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Using microsilica and Si3N4 as silicon sources, black carbon as carbon source, B2O3 as catalyst, SiC whiskers were synthesized under argon atmosphere at 1500 ℃ by carbothermal reduction method. Morphology and crystal structure of SiC whiskers were characterized by transmission electron microscope and scanning electron microscope. The results show that the SiC whiskers synthesized by using two kinds of silica sources are both β－SiC single crystals, and the growth plane is (111) along the direction of [111]. The obvious differences in morphology indicate that there are different growth mechanisms of SiC whiskers synthesized by using different silica sources. VLS growth and screw dislocation growth are suitable to explain the differences in morphology of two kinds of SiC whiskers respectively.
  • The effect of PZT content to the property of PZT/PVDF composites
    CAI Guangqiang;LUO Wenbo;WU Chuangui
    . 2012, 43(13): 1786-1788.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: Thick films of composites of lead–zirconate–titanate (PZT) particulate and polyvinylidene fluoride (PVDF) copolymer have been produced by casting on the indium–tin-oxide (ITO)-coated glass substrates. The phase change of composites during polarization is analyzed by X-ray diffraction and the interface of composites with different PZT mass fraction is characterized by scanning electron microscopy. For application, we used dielectric impedance tester and dynamical experimental setups to analyze the effect of different PZT mass fraction to the dielectric and pyroelectric properties of the PZT/PVDF composites. The results show that, the pyroelectric coefficient increases to 4.1nC/cm2K at a ceramic mass fraction of 50%.
  • Study on the surface resistivity of static dissipative material containing PAN-based carbonaceous fibers
    ZHANG Shan;WANG Chengguo;YUAN Hua
    . 2012, 43(13): 1789-1792.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A kind of antistatic coating was prepared with fluorocarbon resin as matrix, polyacrylonitrile (PAN)-based short carbonaceous fibers as conductive filler. The influences of fiber content, fiber length, coating thickness and applied voltage on the surface resistivity were discussed. The results show that the relationship between surface resistivity and mass fraction of carbonaceous ?ber is suitable for percolation theory, and the percolation threshold is 2.5wt‰ when the length is 4mm; the coating has a surface resistivity of about 106Ω, and have a good antistatic function; surface resistivity decreases with increasing fiber length, but the extent taper off gradually; and yet, the thickness which is less than 134μm has little impact on it; surface resistivity is smaller in high applied voltage compared with low voltage. The conductive mechanism of the coating mainly depends on conductive path theory, tunneling effect and field mission.
  • Preparation of RuO2/Polypyrrole composite electrodes and electrochemical performances
    LI Xiang;GAN Weiping;LI Chang
    . 2012, 43(13): 1793-1796.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    RuO2/PPy composite electrodes are prepared by thermal decomposition oxidation and electrochemical polymerization. RuO2 film was synthesized by coating thermal decomposition method at 260℃ for 3h, and PPy particles were deposited on RuO2 films by electrochemical polymerization. The structure and morphology of the composite electrodes are characterized by infrared spectrometer (IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The structural analysis from XRD patters presents the formation of RuO2 in amorphous phase. IR measurement reveals cross-linking in the RuO2/PPy films. The SEM shows the growth mechanism of PPy particles covering RuO2 films, which PPy particle size sharply increases as the deposition time is over 20 min. The electrochemical performance of composite electrode was test by cyclic voltammetry and galvanostatic. charge-discharge. As deposition time of PPy is less than 25 min, relationship between electric capacity of composite electrode and deposition time was increased. On contrary, As deposition time of PPy is more than 25 min, it is decreased, and so is specific capacitance and deposition time. When it is 25 min , the specific capacitance is 471 Fg-1. Cycling behaviors of RuO2/PPy composite electrodes are stable.
  • Ball Milling Process & Diffusion Mechanism on Water Slurry of Micro La2O3 with Excellent Capability of Dispersion
    JIANG Shihao;LI Xiangfeng;ZUO Dunwen
    . 2012, 43(13): 1797-1801.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Both orthogonal experiment and single factor experiment were used to investigate the effect of ball milling process(including the mass fraction of the powder, rotation speed, milling time, weight ratio of ball to slurry and ball ratio)on the dispersion of water slurry with micro La2O3 powder, and its mechanism was studied. The optimized process parameters were obtained, and it can make the dispersion rate of the slurry arrive to 97.88%. It has been found that the micro La2O3 particles were smaller with uniformly distribution than before by measuring particles size distribution under the optimized process parameters of ball milling. Calculation result showed that one original particle of 6 micron was break down to 1.5 micron particles and 0.25 micron particles with about 1:195 ratio. The curve of settling displacement and diffusion displacement with granularity was given according to the Stokes law and Einstein equation. Settling displacement was equal to diffusion displacement when the particle diameter was 0.23 micron, which can be calculated from above curve. And the diffusion mechanism on water slurry of micro La2O3 with excellent capability of dispersion after ball milling with the optimized process parameters was revealed.
  • Study on properties of hollow fiber nanofiltratiton membrane prepared by radiation graft polymerization
    WANG Xiaolei;WEI Junfu;DAI Zhao
    . 2012, 43(13): 1806-1809.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, we have studied the structure and properties of the nanofiltration (NF) membrane, which was prepared by grafting of 2-acrylamido-2-methylpropanesulfonic acid (AMPS) on the polysulfone (PSF) hollow fiber ultrafiltration membrane using low-temperature plasma-induced graft polymerization. The results showed that the pore size of NF membrane was 2.6nm and the pure water permeability was 44.3L?m-2?h-1?MPa-1, meanwhile, the breaking strength of NF membrane was higher than that of PSF substrate. At a temperature of 25℃ and a operating pressure of 0.4MPa, the rejection to 300mg/L K2SO4, Na2SO4, MgSO4, KCl, NaCl and MgCl2 were 89.3%, 88.3%, 52%, 39.6%, 37.4% and 13.2%, respectively, which indicated that the NF membrane was a negatively charged NF membrane and the rejection to salts was mainly depended on Donnan effect.
  • Synthesis and adsorption of montmorillonite / sodium alginate graft poly (acrylic acid) superabsorbent composite
    ZHU Linhui;ZHANG Lili;TAO Yaoji
    . 2012, 43(13): 1810-1812.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Montmorillonite / sodium alginate graft poly (acrylic acid) superabsorbent composite was prepared by intercalation polymerization of sodium alginate (SA), acrylic (AA) and montmorillonite (MMT) using ammonium persulfate (APS) as an initiator and N,N’-methylenebisacrylamide (MBA) as a cross linker. The superabsorbent composite was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Sorption behavior of heavy metal ions on MMT/SA-g-PAA was investigated. Maximal amount of adsorption for Pb2+, Cu2+and Ni2+ was 968.9，231.0 and 236.0mg/g, respectively, and the adsorption of Pb2+and Cu2+ was in accordance with Langmuir model, while that of Ni2+ was in accordance with Freundlich model.
  • Study on Development and Permeability Properties of Thermal Sensitive Microcapsules for display material
    LI Xinzheng;LI Xiaowei;LAI Weidong
    . 2012, 43(13): 1813-1816.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The thermal development microcapsule with polyurea shell is synthesized with interfacial polymerization method, which is a type of information display material. Thermal properties of polyurea shell are studied by TG /DSC thermal analysis technology. The permeation of developer D-8 is realized by heating method at different temperature and times. The permeation results are detected by infrared spectroscopy technology, and compared with the changes of image density of sample versus the temperature and heating time. The results show that thermal stability temperature of microcapsule shell synthesized by isophorone diisocyanate (IPDI) is about 250℃, and the phase change temperature Tg is about 170℃. The results of infrared spectroscopy show that permeability of developer D-8 increases exponentially with the heating temperature, but increases linearly with the heating time. Image density of sample increases gradually with temperature and heating time, and there are good consistency between the results of thermal development and the result of infrared spectroscopy.
Author Center
Review Center
Journal Online
Copyright © Jorunal of Functional Materials
Tel: 023－68264739　 　
E-mail: gnclbjb@126.com　
Total visitors:
Visitors of today:
Now online:
渝公网安备50010902000552号　渝ICP备2022001025号-1