Jorunal of Functional Materials

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Synthesis of ordered Fe-containing mesoporous carbon materials and its adsorption of 4-Chlorophenol

Yao-yao ZHU;;

. 2013, 44(12): 1-0.

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Abstract: Ordered mesoporous carbon containing iron (Fe/OMC) materials were synthesized via soft-template routes, using phenol-formaldehyde resol (PF) polymerized as carbon precursor, triblock copolymer F127 as template agent, inorganic iron salts ferric nitrate as metal precursor in one pot. The structure was characterized by X-ray diffraction, N2 adsorption/desorption and transmission electron microscopy. The results show that ordered Fe-containing mesoporous carbon materials have well-ordered two dimensional hexagonal mesostructure, uniform pore diameter. On this basis, comparative adsorption properties of 4-Chlorophenol（4-CP） of ordered mesoporous carbon（OMC）and ordered mesoporous carbon containing iron (Fe/OMC). In the initial concentration is 120 ppm, adsorbent dosage is 0.5 g/L conditions, the removal of OMC to 4-CP is 46.6%, and the Fe/OMC is 94.6%, which is about twice than OMC. The adsorption isotherm could be better fitted by Langmuir models, the greatest adsorption capacity of OMC to 4-CP is 83 mg.g-1, and the Fe/OMC is 284 mg.g-1, which is about three times than OMC.

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Research progress of structure in giant magnetoresistance multilayer films

DAI Chuan;CHEN Leng

. 2013, 44(12): 1673-1678.

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Recent investigations of several alloy systems appeared in giant magnetoresistance (GMR) multilayer films were summarized, and the relationship between properties and structures was analyzed. We reviewed the research progress of interfacial roughness, interdiffusion and crystal texture in GMR multilayer films, and discussed the effects of various structure parameters on GMR.

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Research Progress of Dissolution and Stability of Protein in Ionic Liquids

HU Xiao-ling;GUO Xiao-qing;GUAN Ping;QIAN Li-wei

. 2013, 44(12): 1679-1685.

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Protein is an important component of biochemistry, however, its instability in vitro limits its widespread use in bio-applications. As a novel “green” solvent, ionic liquids are potential candidates as substituents of reaction media in enzymatic catalysis because of their unusual solvation characteristics. Due to their fascinating physicochemical properties and tunable structures of anion and cation, ionic liquids can be adjusted to their properties of polarity, hydrophobicity and viscosity, therefore, they are being widely applied in the dissolution and stability of protein. In this paper, the recent advances in the dissolution of protein in ionic liquids are reviewed, and the dissolution mechanism of protein as well as main factors that affect the protein stability in ionic liquids are also discussed.

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The Effect of Fe-Ni alloy on the Shielding Efficiency of Electromagnetic Shielding Composites

ZHU Guo-hui;ZUO Yao-yuan

. 2013, 44(12): 1686-1689.

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As the composition effect of increasing the absorption loss, adding magnetic alloy powder into conductive components can obtain shielding effectiveness with broadband and high efficiency. The effect and influence of Fe-Ni alloy powders on electromagnetic shielding effectiveness in composite materials has been studied through adding different volume fractions Fe-Ni alloy powder into 12% nickel powders. Results show that composites of 4% volume fraction Fe-Ni alloy powder actions the best shielding effectiveness. Accord-ing to the analysis, the addition of Fe-Ni alloy powder increasing the magnetic conducti-vity, electromagnetic absorption and shielding effectiveness while with low secondary pollution.

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Investigation on the stress during the surface oxidation of tubular anodic aluminum oxide membranes and their application

YUE Song;ZHANG Yun

. 2013, 44(12): 1690-1693.

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Tubular anodic aluminum oxide (AAO) membranes were fabricated using the "external anodizing" and "internal anodizing" methods (i.e., anodic oxidation takes place from the outside or from the inside of an aluminum tube), respectively. The effect of stress at the aluminum/alumina interface on tubular membrane was investigated. The results evidently show that the inwardly expanding alumina layer creates tensile stress at aluminum/alumina interface in the "external anodizing" configuration, which facilitates the crack propagation. On the contrary, a compression stress created at aluminum/alumina interface in the "internal anodizing" configuration keeps the membrane compact. Relaxation of the stress at the aluminum/alumina interface was verified to be crucial for obtaining crack-free tubular AAO membranes. At last, the application of tubular AAO membranes on fabricating nanowires and filtration were effectively attempted.

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Microwave-initiated synthesis and physicochemical characterization of grafted cationic starch

ZHANG Hao;WANG Jian-kun;WANG Rui;DONG Yong-chun

. 2013, 44(12): 1699-1707.

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Graft cationic starch (GCS) was synthesized by microwave radiation using acrylamide (AM), β-Hydroxyethyl methacrylate (HEMA) and n-butyl acrylate (BA) as grafting monomers. The graft copolymer was characterized by FT-IR, SEM and XRD, the physicochemical characteristics were studied and the adhesion properties were tested. Results showed that after microwave-initiate grafting modification, the physicochemical properties of GCS improved: the crystallinity reduced, granular structure weakened, hydration capacity raised; the intrinsic viscosity, apparent viscosity decreased, rheological property improved. The adhesion to polyester/cotton fibers of GCS was enhanced, which compensated for the insufficient adhesion to hydrophobic fibers of PVA. The mechanisms that starch physicochemical properties affect its sizing properties were discussed.

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Drug-Loading Chitosan Polymer Microsphere with Targeted and Slow-Release Function and Its Characteristics

YANG Zi-ming;PENG Zheng;ZHOU Min;LI Si-dong;PANG Yu-xin;LI Hong;LI Pu wang

. 2013, 44(12): 1703-1707.

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A novel drug-loaded polymer chitosan microsphere with targeted and slow-release function was prepared using complex coacervation method, with folic acid targeted receptor modified chitosan as the carrier material and 5-fluorouracil as the model drug. The characteristics of the microspheres, including morphology structure, particle size and size distribution, embedding rate, drug loading, infrared spectrum and in vitro drug release properties, were investigated by fourier infrared spectrometer, scanning electron microscope, laser particle size analyzer, laser confocal microscope, ultraviolet spectrum and other modern instruments and analysis method. The results showed that the model drug was successfully embedded in the folic acid modified chitosan microspheres, with 86.5% embedding rate and 32.7% drug loading. The chitosan microspheres were in spherical with good dispersibility and diameter mostly around 5 μm. Laser confocal microscope results indicated that the microsphere was core-shell structure. In vitro drug release experiment showed chitosan drug-loaded microspheres had good slow release effect, with 70% and 40% release rate after 24 hours released in simulation of gastric juice (pH = 1.2) and simulation intestinal juice (pH = 7.4), respectively, which demonstrated the drug release rate was relevant to release medium pH value.

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Silicification corrosion characteristics of monocrystalline silicon furnace carbon materials

CAO Wei-wei;ZHU Bo;ZHAO Wei;WANG Yong-wei;QIAO Kun;ZHANG Shi-lei

. 2013, 44(12): 1709-1712.

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The surface appearance and element distribution of monocrystalline silicon furnace carbon materials after silicification corrosion were tested in this paper, and the silicification corrosion property of different carbon thermal field materials was studied. The results showed that open pores which extend from interior structure to surface provided roads for corrosion and diffusion of silicon melt, so silicification destruction was accelerated. Silicification level was effected by fiber distribution direction in C/C composite, diffusion rate of silicon melt was fast in the direction of fiber axis, and the rate was lower perpendicular to fiber axis. The mechanical strength of C/C composite decreased with silicification time in creasing, and the strength of graphite material first increased and then decreased as time progressed.

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Preparation and Gas Sensing Properties of SnO2 nanocrystals Modified porous Co3O4 nanorods

PAN Lan-ying;HU Ping;ZHAO Hong-bin;DONG Xiao-wen;XU Jia-qiang

. 2013, 44(12): 1713-1716.

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Porous Co3O4 nanorods are fabricated using facile hydrothermal method from CoCl2?6H2O and CO(NH2)2, and further modified with SnO2 nanocrystals through a self-assemblies route. The effects of self-assembling SnO2 onto porous Co3O4 nanorods sensing properties were investigated. The gas-sensing measurements show that after assembling SnO2 nanocrystals onto the surface of porous Co3O4 nanorods, the gas sensing properties of the sensors toward CH3CH2OH and H2S were greatly improved, and the detection limits of CH3CH2OH and H2S were reached 5ppm and 1ppm, respectively.

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Preparation and Photocatalytic Properties of 1D ZnO-Cu2O Core-Shell Nanocomposites

LU Ji-yun;YANG Zhi;ZHANG Li-ying;YU Yuan;ZHANG Ya-fei

. 2013, 44(12): 1717-1720.

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Degradation and removal of organic and inorganic chemicals in waste water become a vital matter for protecting the environment. In this paper, 1D ZnO-Cu2O core-shell nanocomposites were synthesized by using a simple chemical vapor deposition and a simple liquid phase reaction method. The as-prepared 1D ZnO-Cu2O core-shell nanocomposites was characterized by scanning electron microscope (SEM) X-ray energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and their photocatalytic activity of degradation of methyl orange (MO) under an Xe lamp irradiation was investigated by ultraviolet- visible spectroscopy. The results show that the 1D nanocomposites contain both wurtzite ZnO phase and cubic Cu2O phase. The morphology of them maintain a nanowire shape with an average diameter of 35 nm, their surface are covered by a lot of Cu2O nanoparticles. The 1D ZnO-Cu2O core-shell nanocomposites have an excellent ability in degradation of MO, which the decolorization rate is over 91% within 60 min and the photodegradation rate constant K is 2.45h-1.

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Synthesis of BN-MgAlON composite material from boron-rich slag and oxidation mechanism

Liu Ran;WANG Xing-juan;GAO Fu;LI Chao;SUN Yan-qin;LV Qing

. 2013, 44(12): 1721-1725.

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Based on thermodynamic analysis, BN-MgAlON composite materials were synthesized by using boron-rich slag and carbon black as main raw materials. Phase composition, microstructure and oxidation properties of products were determined by X-ray diffraction(XRD), energy spectral analysis, scanning electron microscopy and differential scanning calorimetry(DSC). The experimental result showed that B2O3 was transformed into BN, Al2O3 and SiO2 which could react with nitrogen to form MgAlON phase. BN-MgAlON composite powders were mainly consisted of MgAlON, Sialon and BN. BN-MgAlON composite materials were sintered with adding Y2O3 to the composite powders. The main phases of the material were MgAlON, Sialon, BN and a few of Al5Y3O12 and CaYAl3O7. The oxidation temperature of the materials is around 988oC, and the weight of the samples began to increase rapidly as the temperature keeps rising. The samples can get the maxinmum weight rate of 5.54% when the temperature is higher than 1320oC.

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Preparation and Adsorption Properties of Amino-functionalized Large-sized SiO2 Macroporous Materials

ZHANG Qun;ZHANG Yu-qi;LIANG Yun-xiao;ZHANG Rui-feng

. 2013, 44(12): 1726-1730.

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Large-sized SiO2 macroporous materials were prepared by using a three-dimensional skeletal epoxy resin macroporous polymer as template through an in situ hydrolysis of ethyl silicate and a subsequent calcination at high temperature. The amino-functionalized SiO2 macroporous materials (H2N-SiO2) were obtained through the surface modification of the SiO2 macroporous materials with 3-aminopropyl-triethoxysilane under solvothermal conditions. The as-prepared macroporous materials were characterized by SEM and FTIR. Cu2+ and Pb2+ were selected as simulative pollutants, the adsorption properties of H2N-SiO2 were investigated. The results show that Cu2+ and Pb2+ can be effectively removed from aqueous solution at room temperature and pH 6.5. The adsorption is an exothermic and spontaneous process. The adsorption follows a pseudo-second order process. The equilibrium isotherm is well described by the Freundlich model rather than the Langmuir model and the theoretical maximum adsorption capacities of Cu2+ and Pb2+ are 76.0 mg?g-1 and 143 mg?g-1, respectively. The removal efficiency of Pb2+ is found to be 99.4% at an initial concentration of 50 mg?L-1. After 3 cycles of adsorption, 87.8% removal efficiency of Pb2+ is maintained.

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Growth Mechanism of Hierarchical Hydrangea-like Structures Bi2WO6 Nanocrystals

TANG Jie;JIANG Xiang-ping;ZHAN Hong-quan;CHEN Chao;TU Na;LI Xiao-hong

. 2013, 44(12): 1731-1735.

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Bismuth Tungstate (Bi2WO6) was prepared by hydrothermal method using Bi(NO3)3?5H2O and Na2WO4?2H2O as raw materials and NaOH as mineralizer．Samples were characterized by XRD，SEM and TEM．The effects of synthesis time and temperature on the crystal growth process were evaluated．The growth kinetics of Bismuth Tungstate was evaluated by JMA equation，results showed that Avrami exponent n is located between 0.5~1 which increased as the reaction temperature increasing from 120℃ to 200℃．This means that the growth process of nanostructured Bi2WO6 is controlled by diffusion at low temperature region，and controlled by interface reaction at high temperature region．Then，the growth of crystals experienced nucleation，aggregation and ripening．

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Preparation, Characterization of Rare Earth Phosphotungstates with Dawson Structure and Their Catalytic Properties in Synthesis of Tetrahydrofuran

CAO Xiao-hua;REN Jie;ZHAN Chang-chao;XU Chang-long;XIE Bao-hua;YAN Ping

. 2013, 44(12): 1736-1740.

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Three kinds of Rare earth Phosphotungstates with Dawson structure formulated as RE2P2W18O62 (RE=La,Ce,Y) were prepared and used in catalytic synthesis of tetrahydrofuran from 1,4-butanediol. The catalysts were charactered by FT-IR, XRD and SEM. The influences of rare earth element, catalyst dosage, reaction temperature and reaction time were investigated. The results indicated that La2P2W18O62 showed the best catalytic properties in synthesis of tetrahydrofuran among the three rare earth heteropoly salts. Under the optimal condition, i.e. w (catalyst) =1.2%(relative to the dosage of 1,4-butanediol), the reaction temperature(oil bath) was 180℃, the reaction time was 25 min, the average yield of tetrahydrofuran could reach 97.6%. After reaction these catalysts could be recycled and still exhibited catalytic activity with a yield of 86.6% after five cycle reactions. It was found by means of TG-DTA and Py-IR that the catalyst deactivation was due to decrease of the Lewis acid sites,which was caused by coking on catalyst surface. Compared with using sulfuric acid as catalyst, the present procedure is a green productive technology characterized by process simplification, higher yield and no corrosion for facilities. Moreover, the La2P2W18O62 can be used for many times.

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Electromagnetic wave absorption properties of rare earth element doped multi-walled carbon nanotubes/polyvinyl chloride composites

HOU Cui-ling;LI Tie-hu;ZHAO Ting-kai;MA Yog-shuai;ZHANG Wen-juan

. 2013, 44(12): 1741-1744.

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Multiwalled carbon nanotubes (MWCNTs) doped respectively La(NO3)3 and Ce(NO3)3 as absorber and polyvinyl chloride (PVC) as matrix were used to fabricate MWCNT/PVC composites. The microstructure and micromorphology of MWCNTs doped respectively La(NO3)3 and Ce(NO3)3 were investigated using transmission electron microscope (TEM) and X-ray diffraction (XRD). The electromagnetic wave absorption properties and pyrolysis behaviour of MWCNT/PVC, MWCNT-La(NO3)3/PVC and MWCNT-Ce(NO3)3/PVC composites were measured by a network analyzer and simultaneous thermal analysis. The results indicated that the electromagnetic wave absorbing properties of MWCNT/PVC composites were substantially improved after doping with a suitable amount of rare earth element in the frequency range from 2 to 18 GHz, and the pyrolysis behaviour amost did not changed. In the range of R<-10 dB of the reflection losses, the absorbing bandwidths of MWCNT-Ce(NO3)3/PVC composites was narrower (about 5.4 GHz) than that of MWCNT-La(NO3)3/PVC composites (about 5.6 GHz), and the absorption band and peak value shifted to the higher frequency region. It is favorable to improve the electromagnetic wave absorption properties of MWCNT/PVC composites in a high frequency region.

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The Synthesis and Application of Novel Anti-Impact Protective Microgel

ZHOU Chao;WANG Bo;XU Kun;LIU Yan-ping;HU Hong;WANG Pi-xin

. 2013, 44(12): 1745-1749.

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A novel anti-impact protective micro-gel was synthesized via precipitation polymerization, in which diphenylmethane diisocyanate (MDI) was employed as chain extender. And the structure and morphology of microgel were characterized via IR and TEM. Therefore, the microgels were dip-coated into 3D fabrics to prepare anti-impact protective fabrics. The optimum feed ratio of microgels (Si/B=15:1wt%/wt%，MDI=2.00wt%，TIPT=4.20wt%) was determinated through an orthogonal design based on the mechanical performance of anti-impact protective fabrics. The investigation suggested that the anti-impact performance of anti-impact protective fabrics, which were finished with microgels containing MDI, could be significantly improved in that the molecular weight of polymer was increased stemming from the introduction of MDI. Meanwhile, not only the low reaction and drying temperature could be realized, but also the viscosity of reaction mixture and final product could be sharply dropped after MDI was employed.

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Polypyrrole/Nitric Acid Activated Carbon Aerogel Composite Materials for Supercapacitors

LI Ya-jie;NI Xing-yuan;SHEN Jun;LIU Dong;LIU Nian-ping

. 2013, 44(12): 1750-1754.

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The carbon aerogel(CA) is prepared via sol-gel process ,then treat it in the following three ways: activate by nitric acid; composite with polypyrrole (PPY) by chemical oxidation polymerization; composite after activation .Explore the effects of these approaches. Constitution and morphology of these materials were characterized by Fourier transform infrared spectroscope and scanning electron microscope .The electrochemical performances of materials were tested by by cyclic voltammetry, galvanostatic charge/discharge test ,electrochemical impedance spectroscopy and cyclic test .The results show that the best treatment process is composite after activation. The specific capacitance is two times higher than CA ,the specific capacitance reaches 311F/g at a scan rate of 5mv/s ;after 1000 cycles the specific capacitance nearly at a fixed high value ;the conductivity is also improved.

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Preparation and characterization of porous ceramics

LAN Lin

. 2013, 44(12): 1755-1757.

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Porous ceramics has been prepared in this work by slip casting and sintering. Diatomite and activated carbon are used as the major materials. The development of pore size, porosity, strength and crystal phases during sintering are studied. It is found that the best property combination is obtained by sintering the porous ceramic at 1000℃. The intrinsic pore structure of diatomite is preserved and the ceramic filter has sufficient strength for filtration applications. Filtration test has found that the porous ceramic filter can completely remove bacillus, giving the water meeting the hygienic standard for drinking.

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Synthesis, Characterization and thermal analysis of micro-encapsulated inorganic phase change materials

HUANG JIn;Wang Ting-yu

. 2013, 44(12): 1758-1762.

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Na2HPO4·12H2O@Urea-formaldehyde resin microcapsules were prepared according to thein-situ polymerization method in this study. The influence of the molar ratio of urea and formaldehyde on the structure and morphology of the resulting microcapsules on surface morphology has been investigated and found that it was strongly influences the morphology of the microparticles. The characterization of surface morphology and structure of the microcapsules was investigated by scanning electron microscopy (SEM) and Transmission electron microscopy (TEM). Fourier transform infrared spectroscopy (FT-IR) was employed to characterization of the components of the composite material of the microcapsule. The coefficient of thermal conductivity of the microcapsules was investigated by Laser Thermal Conductivity. Phase change characteristics of the microcapsules were characterized by the Differential scanning calorimetry (DSC), and the thermal gravimetric analysis (TGA) measured the relationship between the weight and temperature of the microcapsules. The results showed that, the microcapsules have been successfully synthesized. DSP can be well encapsulated by the urea-formaldehyde resin, while the MEPCMs with good morphology and small particle size. The weight loss was less than 10% when temperature range heated from 30 to 80 °C. The MEPCMs obtained have an interesting energy storage capacity of 121.2 J/g under 41.5°C that makes it suitable for different applications.

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Influence of calcium formate on sulphoaluminate cement hydration and harden process at early age

MA Bao-guo;ZHU Yan-chao;HU Di;LI Hai-nan

. 2013, 44(12): 1763-1767.

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The influence of calcium formate on setting time, hydration process, hydration products and morphology of sulphoaluminate cement were studied by Vicat apparatus, heat of hydration, XRD, TG-DSC and SEM. The test results show that when calcium formate was added into sulphoaluminate cement paste, the setting process of sulphoaluminate cement is substantially accelerated, the interval of initial and final setting time is shortened. The hydration induction period is notably shortened, the acceleration period begin immediately and the first peak value of hydration heat is increased by 32% by adding calcium formate, but the hydration exothermic rate at hydration stationary phase is not obviously impacted. Adding calcium formate can improve the alkalinity of sulphoaluminate cement hydration environment, increase the degree of crystallinity of ettringite and hydration product is favorable stability at early age, but not change the the hydration product content and morphology at hydration stationary phase.

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Effect of Na ions on the thermal expansion coefficient and hardness of KDP crystals

SUN Yun;WANG Sheng-lai;JIANG Tong;GU Qing-tian;WANG Bo;SUN Shao-tao;XU Xin-guang;DING Jian-xu;LIU Wen-jie

. 2013, 44(12): 1768-1771.

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The Synthesis and Characteristics of Nano-SiO2/ castor oil based-Polyurethane/Epoxy Resin Composites

LIANG Wei;LI Zhen-jiang;ZHANG Lin;ZHU Xiao-xia

. 2013, 44(12): 1772-1777.

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Abstract: Chemical functionalization on nano-scaled silica particles and prevention of agglomeration through the reaction between the silanol group of silica and oxirane ring of reactive diluents, E-44 and glycidyl-terminated COPU, and outstanding performance of TDE-85 epoxy resin, made up of the nano-SiO2/polyurethane/epoxy resin composite. The structure of which was characterized by FT-IR,TGA,SEM and universal testing machine and the damping properties by DMA, the results showed that the modification of nano-scaled silica particles has success synthesize, the nano SiO2/polyurethane/epoxy resin composite was more excellent thermal performance and mechanical properties than E/G-polyurethane/TDE-85 composite, the morphology of section showed good compatibility and prevention of agglomeration, the addition of nano-SiO2 can improve the damping properties of E/G-COPU/TDE-85 composite.

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Preparation and characterization of QF/PEN composite biomaterials

WANG Guang-ni;LI Hong;HAO Xin-yan;CHEN Shu-tian;REN Hao-hao;YAN Yong-gang

. 2013, 44(12): 1778-1781.

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In this study, Quartz fiber(QF)/poly ethylene naphthalate(PEN)composites were prepared by the extrusion method through double screw extruder. The composites were characterized by burning test, IR, XRD, SEM and cell cytotoxicity evolution as well as mechanical test. The results show that QF was uniformly distributed in PEN matrix and the composites revealed the good homogeneous composition. Hydrogen bones were formed between QF and PEN and illustrated a stable interface. When the contents of the quartz fibers are 30% and 45%, the tensile strength are 80.21MPa and 87.96MPa, and the bending strength are 125.71MPa and 137.79MPa, respectively, which were close to those of the natural compact bone. In addition, cytotoxicity test showed that the cytotoxicity levels of the composites were grade 1, indicating that composite had on cell toxicity. We draw the conclusion that the QF/PEN composites have potential application in load-bearing bone repair.

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The preparation of magnetic expanded graphite and the oil adsorption、separation and regeneration

WANG Fan-fei;FENG Qi-ming;WANG Wei-qing;HUANG Yang

. 2013, 44(12): 1782-1786.

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Nano magnetic particles- CoFe2O4 were prepared by chemical co-precipitation method using Co(NO3)2?6H2O and Fe(NO3)3?9H2O ,then composite the CoFe2O4 with expanded graphite to get different loading (mass fraction, the same below) magnetic expanded graphite. CoFe2O4 and magnetic expanded graphite were characterized by means of X-ray diffraction( XRD)、scanning electron microscopy( SEM)、transmission electron microscopy（TEM）and vibration sample magnetometer(VSM). The article study on the oil absorption in different loading magnetic expanded graphite、the competitive adsorption in oil and water、time and temperature on the influence of oil absorption、separation and regeneration the magnetic expanded graphite .The results show that the CoFe2O4 has high crystallinity and the grain size is about 13nm. An increase in oil viscosity and lower CoFe2O4 load results in an increase in the adsorption. Moisture content decreases with higher oil viscosity in the competitive adsorption in oil and water. The oil absorption achieved 80% within 10s and 90s to saturable. The magnetic separation recovery rate of magnetic expanded graphite is 99.2% when the CoFe2O4 load is 35%. and the regeneration oil absorption achieve greater value when centrifugal speed for 3000 r/min.

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Electrochemically Synthesized PANI-MWNT Coatings and Their Effect on Interface Properties of Neural Microelectrode

ZHANG Wen-guang;WU Dong-dong;LI Zheng-wei;LUO Yun

. 2013, 44(12): 1787-1791.

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In this paper, a simple and low - cost method for improving the performance of the neural microelectrodes is reported. The electrochemical polymerization of conducting polymer PANI and PANI-MWCNT were performed to modify the surface of the microelectrode sites, then the morphology and electrical properties of the coated microelectrodes were also investigated to analysize the influence of MWCNT doping on the PANI coating. The result showed that, the surface morphology of PANI coating was improved by MWCNT doping. Compared to the electrode with PANI, the charge injection capacity of the electrode with PANI-MWCNT increased by about 14-fold and the impedance decreased to the original 1/8 (@ 1KHz). The electrical properties was more stable and excellent with PANI-MWCNT coating.

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High Temperature Oxidation Behavior of new Cr19Ni28Ti alloy in atmospheres

CHENG Xiao-nong;JIANG Yang;LI Dong-sheng;DAI Qi-xun;GAO Shi-yuan;WANG Zhi-dong

. 2013, 44(12): 1792-1795.

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The high temperature oxidation properties of the new Cr19Ni28Ti alloy at 700、800、900℃ in atmospheres were investigated by weighting method. Draw the high temperature oxidation kinetics weight gain curve. Investigate the structural changes of the oxide films, X-ray diffraction (XRD). scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) analyses were used. The results show that weight gain at 700、800、900℃ are respectively 0.07mg/cm2,0.1mg/cm2 and 0.45mg/cm2.The new Cr19Ni28Ti alloy has good oxidation resistance. The parabolic type oxidation dynamic curve is observed. The main oxidations contain Mn1.5Cr1.5O4、Fe(Ni)Cr2O4 and Cr2O3 in 700℃. Oxidations in 800℃ increase Fe2.95Si0.05O4. Ti has diffused to the surface and reacted with oxygen in 900℃.

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Synthesis and Properties of Multiple Responsive Macromolecule Fluorescent Probe

LI Jun-feng;SHI Dong-jian;HU Na;DONG Wei-fu;CHEN Ming-qing

. 2013, 44(12): 1796-1799.

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P(Flu-co-NASI-co-NIPAM) copolymer was prepared by free radical copolymerization of N-isopropylacrylamide (NIPAM), 3-Acryloxy fluorescein (Ac-Flu) and N-acryloxysuccinimide (NASI) using azodiisobutyronitrile (AIBN) as initiator. Then, 9-aminoaeridine was employed as chromophore to successfully modify the P(Flu-co-NASI-co-NIPAM) to form thermo-pH multiple responsible macromolecule fluorescent probe, P(Flu-co-9AA-co-NIPAM) at alkaline condition. Its chemical structure and number-average molecular weight were characterized by FTIR, 1H-NMR, GPC and UV-vis. The fluorescence intensity was measured using fluorescence spectra. Results revealed that when T<33 ℃(LCST) or pH=8.9, a yellowgreen fluorescence emission of copolymer is observed. Upon adjusting to T≥33 ℃ or pH=3.1, the emission is blue. Moreover, the emission transition of copolymer showed reversibly and efficiently by changing temperature and pH.

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Few-layer Graphene Nanosheets Produced by Ultrasonic Exfoliation of Secondary Expansion Graphite

GUO Xiao-qin;HUANG Jing;WANG Yong-kai;CHEN Lei-ming;YU Xiao-xia

. 2013, 44(12): 1800-1803.

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Grapheme nanosheets with few-layer grapheme have been prepared successfully by ultrasonic exfoliation after the secondary expanded graphite. The expanded graphite was prepared from natural flake graphite by oxidation intercalation and microwave expansion. The structure and morphology were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscope (AFM) and Raman spectra (RAMAN). The results show that the layer distance of graphite was increased by oxidation intercalation which was easier in the expanded graphite，compared with natural graphite, and the oxygenic groups were grafted at the edge of or between the layers. The grapheme nanosheets were finally fabricated by ultrasonic exfoliation after the secondary expanded graphite, which contained a large number of graphene which was less than 5 layers. It provides a simple and efficient method to produce graphene nanosheets.

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Preparation and function of BRL-encapsulated poly-L-ornithine microcapsule

LIU Yuan-gang;BAI Yan;WANG Shi-bin

. 2013, 44(12): 1804-1807.

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To investigate the influence of poly-L-ornithine on the functions of microencapsulated cells, in this article, BRL-encapsulated poly-L-ornithine/alginate microcapsules were prepared, and the cell viability and the cell functions were studied. The results showed that the BRL-encapsulated poly-L-ornithine microcapsules had excellent integrity and smooth surface. The BRL cells maintained cell viability and the functions to secrete urea and protein in the 3D microenvironment of poly-L-ornithine microcapsules, and it would supply experimental data in the future application of poly-L-ornithine as new membrane material in the filed of cell microencapsulation.

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Preparation and magnetic properties of FeNi/CNxNTs composites

ZHANG Rui;LI Hui;ZHANG Guo;SHI Ke-ying;KONG Li-hong;JING Li-qiang;LI li

. 2013, 44(12): 1808-1811.

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Nitrogen-doped carbon nanotubes (CNxNTs) were synthesized by the catalysts of Fe/MgO and CoxMg1?xMoO4, and the feedstock of pyridine, diethylamine, propylamine, acetonitrile and ethylene diamine for studing the influence on the yield and the nitrogen content of the products of CNxNTs. The yield of the products synthesized by the catalysts of CoxMg1?xMoO4 and the feedstock of propylamine is the highest (920 %). The CNxNTs without any acid treatment were directly decorated with FeNi alloy particles via wet-chemical method, the magnetic properties of the composite were investigated. The results indicate that Fe1-xNix/CNxNTs possess the characteristic of soft magnetic and excellent adsorption separation properties towards the organic pollutant of Rhodamine B (RhB).

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Preparation and photocatalytic activities of Bi2O2CO3/TiO2 composite powders

LV Xiao;TANG Zi-long;ZHAI Xiang-le;LUO Shao-hua

. 2013, 44(12): 1812-1815.

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Bi2O2CO3 was prepared using hydrothermal method，then it was composited with TiO2。The XRD results indicate that the Bi2O2CO3 in this composite photocatalyst is in good crystallinity. The UV-Visible diffusion-reflection spectra results show that the adding of Bi2O2CO3 makes the absorption edge of the composite powders red shift. The photocatalytic activities of the Bi2O2CO3/TiO2 composite powders were evaluated by the photodegradation of methylene blue under the UV-Visible light irradiation. The results indicate the composite powders show a higher photocatalytic activity than TiO2. The optimal photocatalytic activity can be obtained when the mass ratio is Bi2O2CO3:TiO2=0.032.

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Preparation and photocatalytic properties of flake-like C60/ZnO Nanocomposites

CHAI Bo;SONG Fa-kun;CHEN Wen-jie;ZHOU Huan;ZHANG Fen;ZHU Yu-chan

. 2013, 44(12): 1816-1820.

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The flake-like nanostructured ZnO was firstly synthesized though a simple precipitation route, following the C60/ZnO nanocomposites were fabricated via chemical adsorption method. The obtained samples were characterized by XRD、SEM、XPS、Raman、DRS and PL. The photocatalytic activities of as-prepared samples were evaluated under UV light irradiation using methylene blue (MB) as probe molecule. The experimental results showed that the C60/ZnO nanocomposites exhibited the enhanced photocatalytic activity, which were higher than the pure ZnO. In addition, 1 wt% C60/ZnO nanocomposite had the best photocatalytic performance. The significantly enhanced photocatalytic activity for the present nanocomposite originated from the excellent electron-accepting and electron-transport property of C60, which inhibited the recombination rate of photogenerated electron-hole pairs.

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Preparation of Neodymium Doped-Yttrium Aluminum Garnet（Nd:YAG）Nanopowders by Homogeneous Precipitation Method

SONG Qiong;SU Chun-hui;ZHANG Hong-bo;SHAO Jing;ZHU Xiao-wei;WANG Yi-min;WEI Yan-ling

. 2013, 44(12): 1821-1824.

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Abstract：The Nd:YAG nanometer powders were fabricated by the homogeneous coprecipitation method, using Nd2O3, Y2O3, Al(NO3)3?9H2O and NH4HCO3 as raw materials, TEOS as sintering additive. Reaction mechanism of the homogeneous precipitation method for the preparation of Nd:YAG nanometer powder was discussed. The results show that powders are amorphous at 800℃, the large amount YAlO3(YAP) and tiny amout Y3Al5O12(YAG) appear when the calcination temperature is 890℃ and the YAP hexagonal crystal phase transform to YAG cubic crystal phase at 1000℃; the mixed solution is composed of Al3+ precipitate precipitate decision; Al3+ first homogeneous nucleation, then Y3+ and Nd3+ occurs heterogeneous nucleation, the precipitate formed covered in Al precipitate on the surface. The precipitate structure is presumably yttrium coated aluminum core-shell structure.

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30 June 2013, Volume 44 Issue 12