25 June 2010, Volume 41 Issue S1

    

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综述
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  Research progress of structure defects in silicon thin films

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  . 2010, 41(S1): 1-0.

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  Silicon thin films have been widely investigated and applied in industry, as a very important raw material for silicon thin films solar cells prepared. But various structure defects and the defect density in the films have a major impact on conversion efficiency and stability of solar cells. In this paper, defect type of silicon thin films, defect methodology and the effect of these defects on the properties of the silicon thin film solar cells are reviewed, which is expected for improving silicon thin films qualities and conversion efficiency and stability of solar cells.
研究与开发
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  Synthesis of Polyhedral Oligmeric Silsesquioxanes and Their Application in Optoelectronic Materials

  ;Xueming Li

  . 2010, 41(S1): 2-0.

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  Polyhedral oligomeric silsesquioxanes (POSS) is a new organic-inorganic hybrid material, which shows excellent properties shuch as thermal, mechanical, optical and dielectric properties. POSS/polymer nanocomposites can be prepared by added POSS into polymer via copolymerization, grafting and surface modification. In this article, the research focuses on the preparation of POSS/polymer nanocomposite and its applications in the optical and dielectric materials.
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  Fabrication of GaN films on ZnO buffer layer deposited on Si(1 1 1) substrates

  Jian-Ting HE

  . 2010, 41(S1): 3-0.

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  ZnO thin films were first deposited on n-Si (111) at substrate temperatures of 600℃ by PLD. Then GaN thin films were grown on ZnO/Si by r. f. magnetron sputtering system. The as-deposited GaN films were amorphous. Crystalline GaN films were prepared when the samples were annealed in NH3 ambient at 850℃, 900℃ and 950℃ for 15 min. X-ray diffraction (XRD), Fourier transform infrared spectrophotometer (FTIR), Photoluminescence (PL) and Scanning electron microscope (SEM) were used to analyze the effects of the ZnO buffer layer on the crystallization and morphology of GaN thin films.
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  Studies on Characterization and Semiconductor Properties of Type IIb Large Diamond

  Li Shang Sheng;;;;;;

  . 2010, 41(S1): 4-0.

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  The size 4mm of high-quality type Ⅱb large diamonds were synthesized by means of temperature-gradient-method under china cubic anvil apparatus which produces high temperature and high pressure. The impurities of nitrogen and boron in yellow, colorless and blue diamonds were measured by micro Fourier transform infrared (FTIR). The diamond which was synthesized by adding nitrogen getter and boron was concluded as a characterization of the type IIb diamond. In this paper, semiconductor properties of type Ⅱb large diamonds with the varied quantity of doped boron were detected by four-point probe and Hall effect method; The relationships of the quantity of doped boron and semiconductor properties of diamonds were summarized; The doped boron was played a key action in variation of semiconductor properties in type Ⅱb large diamonds.
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  Study on Chalcogenide Lithium-ion Conducting Glasses and Glass-ceramics

  wang yanhang

  . 2010, 41(S1): 5-0.

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  Chalcogenide lithium-ion conducting glasses and glass-ceramics possess attractive properties, such as high ion conductivities, easy shapings, continuous adjustabilities of composition and property as well as excellent nonflammablities, making them potential solid electrolytes used for high performance lithium-ion batteries. The fabrication processes, structures, ion-conducting properties and applications of chalcogenide lithium-ion conducting glasses and glass-ceramics were reviewed. In addition, the prospect of chalcogenide lithium-ion conducting glasses and glass-ceramics was outlined.
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  Electrocatalysis Study of Multi-wall Carbon Nanotubes and Ferrocene /Chitosan Composite Film Modified Glass Carbon Electrode

  Dong-xiang XIE;;Jian-guo MA

  . 2010, 41(S1): 6-0.

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  A robust and effective composite film combined the benefits of ferrocene(Fc), chitosan(CHIT) and multi-wall carbon nanotubes(MWCNTs) was prepared. The composite film performed excellent electrocatalysis and acted as an electron transfer mediator. Under optimal conditions, this modified electrode was able to detect dopamine(DA) in the linear range of 0.5 - 25 μmol /L with a detection limit of 3.89×10-7 mol /L. And common impurities have no effect on the determination of DA. The modified electrode was applied to assessing the contents of DA and obtained a recovery of 98.1% - 100.9%.
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  Synthesize and Characterization of L-cysteine modified Chitosan

  . 2010, 41(S1): 7-0.

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  Abstract: The Schiff reaction was occurred between chitosan and glutaraldehyde，and cross-linking reaction was took place with epichlorohydrin, finally the L-cysteine was grafted to the intermediate product successfully.Using Infrared spectroscopy (IR), X-ray diffraction (XRD), Elemental analysis, Scanning electron microscopy (SEM), thermogravimetry (TG) characterized the synthesis product. The results showed the modified product had a better absorption aperture, the heat stability was improved, and the synthetic product was not dissolved in acidic solution and common polarity solvent.
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  Pressure effect on the Binding Energies of Donors in Strained GaN/AlGaN Quantum Well

  wen shu min

  . 2010, 41(S1): 8-0.

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  The pressure effect of the donors binding energies in strained ( 001 ) oriented zinc-blende AlxGa1-x N quantum wells with finite barriers are investigated with a variational method .The result indicatesthat the binding energies of the donors increase nearly linearly with pressure, even as the modification of strain by hydrostatic pressure and the variations of the electronic effective mass, dielectric constants, and conduction band offset between the well and barriers with hydrostatic pressure is considered. In addition,a simplified coherent potential approximation is used to calculate the influence of Al component in ternary mixed crystal AlxGa1-xN on the binding energies of the donors. The results show that the binding energy increases with A l component under a fixed pressure and. Furthermore the increase of exciton binding energy is more obvious under a higher pressureas increase of Al component.
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  Mn and Cr co-doped impact to Curie temperature of GaAs

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  . 2010, 41(S1): 9-0.

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  this paper analyzes ,when Mn and Cr co-doped, anti-ferromagnetic exchange interaction makes the Curie temperature of material decrease; in order to prepare high Curie temperature of the material requires higher doping concentration , preparation of high Curie temperature of the material more difficult; a high hole concentration can effectively suppress anti-ferromagnetic exchange interaction in the Curie temperature of the material.
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  Synthesis and properties of novel comb-polyurethane associative thickener

  . 2010, 41(S1): 10-0.

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  A series of comb-polyurethane associative thickeners modified by pendant aliphatic groups were obtained by hydrophobic diol which was introduced into the chain of pre-polyurethane, then characterized by FTIR and GPC. The effects of hydrophobic diol/OH(including hydrophobic diol and PEG) and the size of mid-hydrophobic alkyl group were studied. The results showed that: Hydrophobic groups were the most important effect on thickener efficiency, as the molar ratio of hydrophobic diol/OH increasing, the thickener efficiency was notable enhanced. With the size of mid-hydrophobic alkyl group adding, association effect was reinforced, and then thickener efficiency was enhanced.
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  1-3-2 Ceramic/Epoxy Piezocompsite and Cylinder Array Transducer

  Li Li

  . 2010, 41(S1): 11-0.

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  The modified 1-3 piezocomposites were prepared in order to improve the stability of underwater acoustic transducers. The composite consists of 1-3 ceramic/epoxy composite and ceramic plate with series pattern. The cylinder transducer array made of modified 1-3 composite was fabricated. The performance of the transducer was investigated. The resonance frequency is 72kHz when the diameter of the transducer is 85mm. The transmitting voltage response reached 139dB at 72kHz, the receiving sensitivity was -212±4dB in the frequency range of 20kHz to 60kHz, the directivity response was even in horizontal direction and the beam width was 12° in vertical direction.
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  Study on Preparation and Anti-icing Performance of Super-Hydrophobic Surface on Aluminum Alloy

  . 2010, 41(S1): 12-0.

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  Abstract:　There-dimensional and binary structures of aluminum alloy surface was fabricated with chemical etching method, and then the surface was modified with palmitic acid. The as-prepared surface shows well super-hydrophobic property, which the water contact angle could reach up to 157 ° with sliding angle smaller than 3 °. The images and elements of the as-prepared surface was investigated by scanning electron microscopy and X-ray photoelectron spectroscopy, Simultaneously, the anti-adhesion of super-hydrophobic aluminum alloy surface was tested, as well as the anti-icing and anti-frosting characteristic were studied. The result indicates that the as-prepared super-hydrophobic surface meet the Cassie model, and all the as-prepare surface not only show good super-hydrophobic and anti-adhesion property, but also has extend freezing time and less frosting feature.
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  Growth of ZnGeP2 by Horizontal Gradient Freeze Method

  ;HUANG Fei;;chen lin ;

  . 2010, 41(S1): 13-0.

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  ZnGeP2 polycrystal was synthesized directly from high pure(6N) Zn, Ge and red P elements according to the ZnGeP2 stoichiometry with a excess of 0.2% P. The ZnGeP2 single crystal with dimensions of 10×20×80mm3 was obtained by Horizontal Gradient Freeze Method with the synthesized polycrystalline material. As-grown crystal was characterized by X-ray diffraction, IR spectrophotometer and physical property measurement system.The results show that the ZnGeP2 crystal is crystallized well and the infrared transmission is relatively high. The infrared transmission of a ZnGeP2 wafer (uncoated,unannealed) with 5mm thickness is above 54% in the region of 2-8μm. The thermal conductivity around room temperature（297.34K）is 35.89W/mK.
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  Investigation on the Removal of Phosphorus, Aluminum, Calcium from Metallurgical Grade Silicon Using Electron Beam Melting

  Qiang WANG

  . 2010, 41(S1): 14-0.

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  Behavior of phosphorus, aluminum and calcium in metallurgical grade silicon has been investigated during electron beam melting with melting time modified. The results showed that the content of phosphorus, aluminum and calcium gradually decreased with time passing, and the lowest content of these impurities were 2.2×10-5 wt% P, 8.5×10-5 wt% Al and 1.5×10-4 wt% Ca respectively. The removal rates of these elements were expressed by the first order equation. Rate constants for phosphorus, aluminum and calcium were 0.11 min-1, 0.12 min-1, 0.13 min-1 respectively.
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  Study on preparation and properties of Capric acid-Lauric acid/expanded graphite phase change materials

  MA Feng

  . 2010, 41(S1): 15-0.

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  Abstract: Capric acid-lauric acid/expanded graphite shape-stabilized phase change materials (CA-LA/EG) were prepared by using the eutectic mixture of capric acid (CA) and lauric acid (LA) as phase change material, porous expanded graphite (EG) of high adsorption characteristics as supporting matrix. The structure and properties of the materials were studied by ESEM，DSC and the test of melting and solidification process. The results show that the capric acid-lauric acid is well sealed into the inner pore of porous graphite, the mass fraction of the eutectic mixture in CA-LA/EG is found to be 80.47%, phase change temperature and latent heat of CA-LA/EG is 19.50℃ and 93.18J/g respectively, and the thermal conductivity of the shape-stabilized phase change materials is enhanced to a certain extent as compared with that of capric acid-lauric acid.
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  Preparation and antibacterial activity against E.coil of thiourea chitosan/montmorillonite nanocomposites

  . 2010, 41(S1): 16-0.

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  In this research , a novel nanocomposite thiourea chitosan / montmorillonite ( Cts-TU/ MMT) was prepared through solution intercalated reaction. The properties of this nanocomposites were characterized by X-ray diffraction (XRD) and Fourier transformed infrared ( FT-IR). The results showed that Cts-TU had intercalated into MMT. The basal spacing of montmorillonite is high to 3.529nm. Evaluation of Cts-TU/ MMT nanocompo- sites by inhibitory kinetics test .Indicates its potential candidates for various applications in medical field.
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  Calculation of The Field Emission For The CNTs Array With Normal-Gated of Cold Cathode

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  . 2010, 41(S1): 17-0.

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  Abstract：Usually there are two methods, floating charge sphere method and solving Laplace equation method, have been used to simulate the Carbon nanotubes (CNTs) Field Emission Display (CNT-FED) at present. Although solving Laplace equation is difficult, but it could get the electric field and potential distribution of CNT array FED in the whole space. A hexagon pitch CNTs array vertical to the normal-gated of cold cathode FED which would be useful for future application is simulated by solving Laplace equation in this article. The calculated results show that the intensity of the electric field is very strong near the top of the CNTs, and drops abruptly with the increasing of the distance from CNTs. the field enhancement factor increases with the increasing aspect ratio of the CNTs. For CNTs with definite aspect ratio, there are optimum densities that correspond their best field enhancement factor. Emission current density can be control strongly by the gate voltage in this structure, and get the emission current density around the CNTs with the change of the distance between cathode and anode. The biger the gate voltage, the greater the influence of the emission current, and the emission current density(J) were decreased with distance of anode-cathode (d) increase.
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  Permittivity-grads Wave-absorbing Carbon nanotubes /epoxy resin composites Optimization by Genetic Algorithm

  XU Jian Guo ;

  . 2010, 41(S1): 18-0.

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  Carbon nanotubes/epoxy resin composites were prepared by dispersion carbon nanotubes into epoxy resin in an ultrasonic bath. Electromagnetic parameters of the 2wt%、5wt%、9wt% carbon nanotubes/epoxy resin composite were obtained. The results show that the complex permititivity increases as the weight content of carbon nanotubes increases . The best permittivity-grads structure of absorbing materials is double-layer 5wt% and 9wt% carbon nanotubes/epoxy resin composite by genetic algorithm optimization. The thickness of 5wt% and 9wt% composite is respectively 0.5146mm and 1.3255mm. The maximum frequencies range for absorbing value less than -5dB of the double-layer composites was 8.48GHz.
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  Study on explosive consolidation technology of W/Cu alloy

  . 2010, 41(S1): 19-0.

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  The W/Cu alloy powders were produced by mechanical alloying. The pre-compacted powder mixtures were reduced at various temperatures in the flowing hydrogen atmosphere. The reduced powders were explosive consolidated to fabricate dense W/Cu alloy in a cylindrical configuration/single tube set-up. The biggest density of the compact samples arrived at 98.1% T.D. The microstructure of the samples was analyzed. The sample was analyzed by EPMA and the fracture surface was investigated by SEM. The hardness and conductivity were measured. The results showed that W/Cu alloy powders could been consolidated in high density and the alloy material had high hardness and uniform structure. The physical performances is fine.
简报
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  The immunological mechanism of endothelial inflammatory activation induced by PU and PTFE

  yang xue;Jiao Sun

  . 2010, 41(S1): 20-0.

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  Polyurethane (PU) and polytetrafluorethylene (PTFE) are 2 commonly used blood-contacting biomaterials. In the present study, we used a noncontact coculture model to evaluate the thrombosis-causing potential of monocyte-mediated PU and PTFE. We used human endothelial cells from umbilical cord (HUVECs) and human monocytes (THP1 cells). The THP1 cells were directly exposed to PU/PTFE, and the resultant cell-free supernatants were harvested for stimulating HUVECs. The results demonstrated that both PU and PTFE induced the expressions of monocyte chemoattractant protein-1 （MCP-1）and macrophage inflammatory protein-1α （MIP-1α）in HUVECs. To further investigate the role THP1 cells played in the process, MTS assay was used to measure the THP1 cell viability and ELISA was used to detected monocyte-derived soluble factors that might contribute to these effects. In comparison with the results for the negative control, both PU and PTFE variably induced THP1 cell proliferation and activation, and subsequently caused the release of soluble factors TNF-α/ IL-1β. Our results suggest that the blood-contacting biomaterial induces monocytic proliferation and activation, which contribute to the release of proinflammatory factors and inflammatory activation in HUVECs, and finally cause thrombogenesis.
综述
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  The Progress of Using Magnetic Nanoparticles as Gene Vector

  LI Yao

  . 2010, 41(S1): 21-0.

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  Abstract: As a nonviral gene vector，the magnetic nanoparticle mediated gene transfection (magnetofection) has been one of the most prospective technology in gene therapy. This paper mainly introduces 1) the varieties and characteristics of magnetic nanoparticles as gene vector, 2) the recent progress on magnetofection, 3) the localization and dynamics of magnetic nanparticles complexes in cell, and 4) present problems and future prospect.
研究与开发
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  Synthesis and capacitance properties of nano-sheet NiO

  xiangyu hou;Jing Feng ;

  . 2010, 41(S1): 22-0.

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  Nano-sheet NiO was synthesized by a very simple route in oxalic acid solution at 500℃. The morphology, crystal structure and electrochemical properties of obtained products were tested by SEM, XRD, cyclic voltammetry curve and constant current charge-discharge. Results showed that the synthesized NiO was single hexagonal phase and the nano-sheet was 100-150 nm in length and 30-50nm in width. It was found that the obtained NiO showed a good capacitance due to abundant Ni ions on the surface of nano-sheet. There were two pairs of well defined redox peaks and the specific capacitance was 157.89 F/g.
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  Preparation of β-tricalcium phosphate/chitosan composite scaffolds and its effect on osteoblasts behaviour

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  . 2010, 41(S1): 23-0.

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  β-TCP/CS composite scaffolds were prepared using the freeze-extraction and freeze-gelation methods. SEM、XRD、FTIT and omnipotence material testing machine were employed to characterized the β-TCP/CS composite scaffolds. It was shown that the porosity of the β-TCP/CS composite scaffolds is above 85% and decreased with the increase of the β-TCP content. The β-TCP/CS had highest compress strength (1.73MPa) when the β-TCP content is 70%. Meanwhile, the SEM results showed that the β-TCP/CS composite scaffolds had the porous structure with the pore size from 200μm to 500μm when the CS/β-TCP ratio was 30:70. Mouse MC-3T3-E1 cells were seeded onto the surfaces of the β-TCP/CS composite scaffolds. After 7days of culture, it was shown that the cells attached, growthed and proliferated well on the surface, which implied that the β-TCP/CS possessed good cytocompatibility.
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  Preparation of EVOH / nano-SiO2 Composites by Solution Co-blending and its Properties

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  . 2010, 41(S1): 24-0.

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  Abstract：Nano-SiO2 was prepared by chemical precipitation method and in-situ modified with silane coupling agent KH550. The EVOH / nano-SiO2 composites were prepared by solution co-blending method with the N, N-dimethyl-carbamoyl ammonium as the solvent and blown into a film. Nano-SiO2 and composites were characterized and characterized by FT-IR, DSC, TG, TEM and SEM, and the barrier properties, mechanical properties, and transparency of the composites were tested. The results showed that the nano-SiO2 prepared by chemical precipitation method was spherical and the average diameter was about 20 nm. Chemical bonds were formed between nano-SiO2 and silane coupling agent KH550 and the in-situ modification effect was good. When the EVOH / nano-SiO2 composites were prepared by solution co-blending method, the nano-SiO2 dispersed in the EVOH evenly. Compared to the pure EVOH, the tensile strength of the EVOH / nano-SiO2 composites increased by 96.3%, the coefficient of moisture permeability and permeability coefficient of the EVOH / nano-SiO2 composites decreased by 35.9% and 51.1% respectively, light transmission rate was 75.6% and haze was 12.74%.
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  Adsorption Properties of 8-hydroxyquinoline Chelating Resin Based on Phenolic Resin Skeleton

  Chang Huai Chun

  . 2010, 41(S1): 25-0.

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  In this paper, a new chelating resin with phenol formaldehyde resin as skeleton and 8- hydroxyquinoline as functional group was synthesized through the Friedel-Crafts reaction, in which 1,4-bis(chloromethoxy) butane (BCMB), phenol formaldehyde resin (PF) and 8-hydroxyquinoline are as raw material. The name of the chelating resin is abbreviated as PF-HQ. Adsorption capacity and adsorption selectivity of the PF-HQ chelating resin for different metal ions are studied .The adsorption properties of the PF-HQ chelating resin for Cu2+ and Pb2+ ions are studied by the static method. The experimental results show that the adsorption isotherm process accorded with Freundlich models. In addition, the adsorption kinetics of the PF-HQ resin also suggests the accordance with Boyd film diffusion equation. Breakthrough points of Cu2+ and Pb2+ on PF-HQ column are 22nd bed volume and 17th bed volume respectively under dynamic condition. It is good to use 5mol/L nitric acid for removing Cu2+ and Pb2+ irons. It is found that both the rate of desorption for removing over 96% the Cu2+ and Pb2+ ions respectively adsorbed on PF-HQ are 3 bed volumes. The PF-HQ resin has good eluted properties.
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  Graphite Oxide (GO) Modified Sn/C Composite for Lithium Ion Battery Anode

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  . 2010, 41(S1): 26-0.

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  Abstract: Tin particles were loaded into carbon matrix to form Sn/C composite for improving the cycling stability meanwhile the capacity of the composites were poor due to the low content of tin. Considering to enhance the performance of the Sn/C composites that were prepared by hydrothermal treatment from the resorcinol-formaldehyde (RF) gel in which tin tetrachloride was coated to form the organic tin precursor, graphite oxide (GO) was introduced to modify the preparation. The modification could reinforce the combination between the tin particles and carbonaceous buffer matrix. Cyclic voltammetry (CV) curves indicated that the irreversible converting in the process of the intercalation/extraction of Li+ decreased after modification. The diffusion coefficiency of Li+ in the modified composite increased from the analysis of the electrochemical impedance spectroscopy (EIS). The capacity of the modified Sn/C composites remained 270 mAh/g after 90 cycles, and the ratio of the retention capacity was trend to 100% after 35 cycles.
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  3D nanofibrous poly(l-lactic acid) scaffolds with large pores fabricated with a single Thermally Induced Phase Separation method

  Xiong-fei ZHENG

  . 2010, 41(S1): 27-0.

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  Poly(L-lactic acid) (PLLA) three-dimensional (3D) scaffold with pores larger than 100μm and uniform distribution nano?brous structure was fabricated by a single phase separation from a ternary PLLA/dioxane/water system without other porogen methods or fabrication means. The cloud and gelatin points of this ternary system were measured. The porous morphology and nano?brous structure of the scaffold were closely related to the quenching route and formulation parameters, including polymer concentration, solvent composition, quenching temperature and aging time. The optical parameters for fabricating scaffold with large pores and nanofibers is gelation for 15min at 25℃ with 5wt% PLLA solution(dioxane/water=87/13).
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  Study on Montmorillonite Intercalation with Polymer Diallyldimethylammonium Chloride- Acrylamide

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  . 2010, 41(S1): 28-0.

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  A series molecular weight of polymer diallyldimethylammonium chloride-acrylamide (~5500Mn, ~6000Mn, ~8500Mn and ~20000Mn) was prepared. Study on polymer diallyldimethylammonium chloride-acrylamide (PDM-AM) intercalated Na+ montmorillonite (Na-MMT) by using purified PDM-AM, unpurified PDM-AM and protonized PDM-AM respectively. Different dosage of purified PDM-AM (～6000Mn) was intercalated montmorillonite. XRD results indicated that PDM-AM could intercalate Na-MMT, but unrection monomer was disadvantage for polymer intercalates Na-MMT. The effect of intercalating Na-MMT was not improved by using protonized PDM-AM. The d spacing of polymer intercalating montmonrillonite was increasing with increasing polymer dosage. The diffract peak was broaden when the polymer dosage was 1.4 CEC.
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  Effect of Mg content and annealing on the structure

  . 2010, 41(S1): 29-0.

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  Abstract The Zn1-xMgxO(x=0.1,0.2,0.3, 0.4,0.5,0.6)thin films were prepared on glass substrate by the Sol-Gel method。The X-ray diffraction results show that when the value of x is between 0.1 and 0.3, the thin film has the structure of hexagonal wurtzite while the angel of the diffraction peak becomes bigger with x, and the MgO impurity phase segregates at x=0.4。For the sample with x=0.1 annealed at 500℃, the crystal quality of the films is improved with the increase of the rate of temperature rise from 5℃/min to 6℃/min。For the sample with x=0.2, the crystal quality of the films is improved with the increase in annealing temperature from 500℃ to 560℃。With the annealing temperature increasing above 590℃ the crystal quality of the films degenerates。
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  Research on Preparation and Properties of UV curable waterborne polyurethane coating modified by Biphenyl A

  FANG Zhen-Hua

  . 2010, 41(S1): 30-0.

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  The novel ultraviolet curable waterborne polyurethane (UVWPU) was synthesized by using isophorone diisocyanate (IPDI), polyethylene glycol (PEG, MW=600), α, α-dimethylol propionic acid (DMPA) and bisphenol A. The rigid moiety was introduced into the polyurethane main chain to improve the heat resistance. The copolymer structure was confirmed by FT-IR. The effect of the molar ratio of IPDI / PEG600, dosage of DMPA and bisphenol A on the properties of latex and coating film were investigated. The results show that the storage stability of emulsion was longer than 6 months when the DMPA dosage was above 5.76%. With the DMPA dosage from 5.76% to 9.04%, the average particle diameter was decreased from 90.16μm to 43.30μm. The UVWPU film exhibits good appearance and excellent properties when the molar ratio of IPDI / PEG600 was more than 3.4. The properties of the modified film were as follows: H of pencil hardness, 1 of adhesion, 5% weight-loss temperature at 233℃. The temperature of 5% loss weight was 14℃ and the Tg was 7.07℃ higher than the UVWPU without using bisphenol A. The heat resistance, pencil hardness and adhesion of the film were improved by using bisphenol A as the chain extender. No change was found after placed the modified film at 100℃ with 200h.
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  The Effects on Morphologies of Cuprous Oxide Prepared by Solvothermal Method Using Different Alcohols

  DONG Hai-Liang

  . 2010, 41(S1): 31-0.

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  Cuprous oxide micronparticles with different morphologies were prepared by solvothermal method using copper acetate, triethanolamine, and alcohol as raw materials. The morphology and crystalline phase of the products were examined by SEM and XRD separately; the results show that, at an appropriate reaction temperature, choosing different alcohols will lead to forming micron spherical cuprous oxide. Furthermore, with increasing hydroxyl in alcohol, the reaction temperature for forming spherical cuprous oxide will decrease gradually. Meanwhile, it also shows that alcohols play a role in the reaction process for the formation of cuprous oxide microcrystal.
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  Studies of Properties of Nano-SiO2/ Silicone Modified Polyacrylate Composite

  Jianhua Zhou

  . 2010, 41(S1): 32-0.

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  Nano-SiO2/ silicone modified polyacrylate emulsifier-free emulsion was synthesized by emulsifier-free emulsion polymerization and sol-gel technique. The effect of the content of nano- SiO2 on emulsion stability, solvent resistance and optical properties of film was investigated. The microstructure of the emulsion and film was studied by TEM and SEM. The results indicated that the emulsifier-free emulsion had better polymerization stability, and centrifugal stability of emulsion decreased with the increasing content of nano-SiO2. The water resistance of Nano-SiO2/ silicone modified polyacrylate hybrid film was better than that of silicone modified polyacrylate film, and increased with increasing content of nano-SiO2. The hybrid film had good light transmittance and ultraviolet light absorption property. In the hybrid film, silica domains smaller than 100 nm were dispersed homogeneously in the polyacrylate component.
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  Effects of Zn doping on the electrochemical performance and tap density of Li4Ti5O12

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  . 2010, 41(S1): 33-0.

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  The Zn-doping Li4-2xZn3xTi5-xO12(0≤3x≤0.2) as anode materials for lithium-ion batteries were synthesized by a solid-state method. The morphology and microstructure of the samples were characterized by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), mastersizer 2000 laser granularity analysis (MS2000), and tap density analysis. The relative capacity and the cycle characteristics of the Zn-doping Li4Ti5O12 have been tested, and then the samples were characterized by AC impedance spectroscopy and cyclic voltammetry. The Zn2+ did not change the crystal structure, but enhanced the tap density of the materials. The results shown that the Zn-doping reduced the polarized voltage and improved the electrochemical performance of the materials. When the ratio of the Li︰Zn︰Ti was 3.933︰0.1︰4.967, the first charge capacity of the Zn-doping Li4Ti5O12 was 160mAh/g with a current density 1C, and after 60 cycles it was still 138mAh/g.
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  Synthesis of nylon1010-carbon nanotubes composites and its microwave behavior study

  . 2010, 41(S1): 34-0.

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  Nylon1010 and carbon nanotubes composites were prepared by in situ polymerization. Scanning electron microscopy (SEM) images showed the surface structure of composites. Microwave network analyzer HP8510C with direct reflection line calibration procedure are used to test the composites’ microwave property. It is observed that the composites has good insulation and can be used as high-energy storage system.
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  Simple hydrothermal synthesis and characterization of ZnO nanorods

  . 2010, 41(S1): 35-0.

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  Zinc oxide nanoparticles were prepared by using hydrothermal synthesis method.The effect of synthesis conditions on the properties of nanometer was studied. ZnO nonoparticles were obtained when using Zn(NO3)2,NaOH and H2O as properties and hydrothermalmedia. The X-ray diffraction(XRD), the electronic resistivity and the photoluminescence spectrum are applied to investigate the optical and electric properties of ZnO. The result indicated that the samples are zincite in structure and show sharp diffraction peak of ZnO at (101);The electronic resistivity decrease with increasing the time and temperature of synthesis. When time of the synthesis was 25h and temperature was 200℃,ZnO was purest and higher emission at 376nm ,500nm-600nm , the particle figure was rods ,and the even diameter of the nanometer-sized rods ZnO was about 30-40 nm and its length was about 300-400 nm analyzed by TEM. The reasons of the above-mentioned phenomena are deeply discussed.
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  Reflection Properties against Electromagnetic Waves of Chopped Carbon Fiber Reinforced Cement Mortar

  Wang ChuangLI He-Jun;

  . 2010, 41(S1): 36-0.

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  Short carbon fiber reinforced cement mortar specimens were prepared using a “six step” molding process. The reflectivity of the specimens was measured by the NRL reflectivity test system to study the influences of carbon fiber fraction, water/cement ratio and high efficiency water reducing agents on the electromagnetic reflective properties of the mortar in the frequency bands between 8~18GHz. The results showed that the maximum absorption peak value of a non-doped carbon fiber cement mortar against the electromagnetic waves was -29.3dB. The reflection of the mortar against the electromagnetic waves were gradually increased with the increase of the carbon fiber fractions from 0.2% to 1.0%. A turning point ocurred when the carbon fiber mass fraction was 0.6%, above which all the reflectivity values were greater than -10.0dB. Under the same circumustances, the reflectivity was greater when the water/cement ratio was less than 0.6, below which the wave absorbing property of the mortar was dominant. When the water/cement ratio was over 0.6, this property remained in the high frequency bands. The reflectivity values at different frequencies were greater than -8.0dB after superplasticizers were added. Compared with the electromagnetic properties with naphthalene superplasticizers or without any superplasticizers, the mortar exhibited mainly reflection against electromagnetic waves when a polycarboxylate superplasticizer was added.
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  The Study on Rheological Model of Viscoelastic Fluid for Thermo-tropic Gel

  QIN Guo Wei

  . 2010, 41(S1): 37-0.

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  The features of thermo-tropic polymer are that viscosity will be increased with rising temperature, which is different with traditional gel and viscoelasticity. So it is necessary to study on rheological behavior of this gel, which can provide a theoretical basis its application. In this paper, we studied the relationship between strain and time of thermo-tropic gel. According to the basic rheological model of viscoelasticity the basic rheological model of viscoelasticity was established by experimental data and fitted the constants of different conditions. We analysis the rule of viscosity, elasticity, as well as the rate of reaching another equilibrium.
综述
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  Development of the solidifier of epoxy resin

  ;Guo Wen ying ;;

  . 2010, 41(S1): 38-0.

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  Epoxy resin was widely used in structural building because of the excellent performances. The kind and dosage of solidifier have great effects on the solidification and the mechanical performances of the epoxy resin mortar. So the solidifier is an important part of the epoxy resin mortar. Many kinds of solidifiers used in structural building or studied in lab were introduced. And the developing aspect of solidifier was pointed out.
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  Research Development of Si Antireflective Layer Produced by Metal Particle-catalytic Etching

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  . 2010, 41(S1): 39-0.

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  Studies on catalytic actions of noble metal nanoparticles are hot off the press in current fields of advanced materials and energy science. Recently, etchings of silicon substrates using noble metal particles as assisted catalysts to fabricate antireflective layers for solar cells have been intensively studied. This paper reviews the present status of antireflective layers on substrate using noble metal particles as catalysts. The reaction mechanism and influence factors are analyzed and possible developments in the field of thin-film solar cells are prospected.
研究与开发
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  Evaporation behavior of calcium in metallurgical silicon by an electron beam melting method

  . 2010, 41(S1): 40-0.

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  In order to investigate Ca evaporation behavior in the electron beam melting process, metallurgical-grade silicon was melted in an electron beam furnace with electron beam power kept constant while the melting time changed. And the relationship between yield of Si and Ca content was discussed.The results showed that the content of impurity Ca was significantly decreased in the early period of melting, and then changed slowly with the extension of the melting. The free evaporation of Ca at 2133 K, the calculated surface temperature of the liguid silicon, followed first order kinetics. The overall mass transfer coefficient of Ca was determined to be 2.64×10-5 m/s, and the removal rate of Ca was controlled by the transfer of Ca atoms from the bulk liquid silicon to liquid/gas phase interface.
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  Fiber Orientation Coupling Simulation Model in Injection Molding

  . 2010, 41(S1): 41-0.

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  Short fiber composites injection molding is one of very complicated fluid flowing process, the forming and evolvement of its multi-scale structure is a problem coupling multi-layer and multi-scales. Through studying its injection molding process, fiber particle was developed by Using model of rigid rod. Based on the macroscopic continuum equation, double-scale models of main and front fluid were established by Lagrange－Euler methods, which coupled both macro-scale and meso-scale. The results agree with the rule of fiber orientation induced by the flow.
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  Finite Element Simulation of Influence of Lining’s Material on Temperature Field of Friction Pair in Hydro-Viscous

  . 2010, 41(S1): 42-0.

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  Combining heat conduction model and boundary conditions of steel disk, a theory model of transient temperature field was established. And the modified formula for heat flux was deduced. Then the temperature field of the steel disk which belongs to copper-based friction pair and paper-based friction pair, was solved in ANSYS. The results show that the distribution law of surface temperature of the two steel disks is almost same. The surface temperature increases with the radius, while the highest temperature doesn't appear at outer radius, for there existing convection heat transfer between outer radius and working oil. Under the same condition, the surface temperature of the steel disk belonging to the paper-based friction pair is much higher. The deformation of the steel disk is approximately a linear relationship with the radius, and larger deformation appears in the steel disk belonging to the paper-based friction pair. Finally, the selection principle of the friction lining's material is given. The experimental results are the same as that of numerical simulation. Therefore, research results can provide an important guidance to the design of the friction pair and the selection of the friction lining's material in hydro-viscous drive.
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  Synthesis and Characterization of Flower-like Bi2WO6 and Its Photocatalytic Activity

  HUANG Yi

  . 2010, 41(S1): 43-0.

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  The flower-like Bi2WO6 sample was successfully synthesized by a simple hydrothermal method without any surfactant. The crystal structure and morphology of the samples were characterized by XRD, SEM and BET technologies. The affecting factors on photocatalytic degradation Rhodamine-B (RhB) were investigated. The experimental results showed that the photocatalyst which processed highest photocatalytic activity was synthesized at 180℃ for 12h; when the dosage of Bi2WO6 was 2g/L, irradiation time was 30min under 500w Xe lamp and the RhB concentration was 10mg/L with the originally pH of the solution, the degradation rate of RhB was up to 99.6%.The flower-like Bi2WO6 sample synthesized by a simple hydrothermal method had high photocataltic activity.
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  The Simulation Study of Radiative Heat Flux Intensity Distribution with Different Assignments of Carbon Fiber Electric Heating Elements

  cao wei wei

  . 2010, 41(S1): 44-0.

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  A mathematical model for the radiative heat flux intensity distribution of many carbon fiber electric heating elements is set up and simulated with software MATLAB, and the influence of radiative heat flux distribution with different collocation and electric power is researched. The results show that the uniformity of radiative heat flux intensity is comprehensive affected by different elements’ spacing and the radiative distance, the radiation uniformity reduces with the spacing of elements and improves with the radiative distance. The uniformity of radiative heat flux intensity can be advanced by proper assignments of electric powers. With the given experimental condition, the simulation results show that the arched radiative heat flux intensity field can be achieved when s=15cm, h=12cm and the assignment of powers is 1000W-600W-1000W.
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  Properties of Natural Rubber/Caboxymethylchitosan Antibacterial Composite Film

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  . 2010, 41(S1): 45-0.

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  A novel composite was prepared by adding caboxymethylchitosan into natural rubber latex throngh latex mixing. The results show that the cross-link desity appreciably reached to 5.75×10-5mol/cm3. Comparing with pure NR film the mechanical property of NR/CCS composite film was enhanced to 11.25 MPa because of the cross-linking affect and the flexibility modulus of the composite film increase leading to be more rigid. Moreover hydrogen bonds existed between the molecular of NR and CCS through NMR and DMA testing.
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  An optical transmittance spectroscopy study on hydrogenated nanocrystalline silicon films with different crystalline volume fractions

  GUO Li Qiang;

  . 2010, 41(S1): 46-0.

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  Intrinsic hydrogenated nanocrystalline silicon （nc-Si:H） films were prepared on Corning 7059 glass by plasma enhanced vapor deposition (PECVD) technique with radio frquency (RF) and DC bias stimulation. In this paper, the DC bias was changed from 50V to 250V with RF power, chamber pressure, silane and hydrogen mixing ratio and substrate temperature being kept constant. The microstructure of the films was characterized by Raman scattering, their transmittance spectroscopy was gained by transmission electron microscope (TEM). It was found that improving DC bias caused crystalline volume fractions (Xc) to change along the “S” curve, the minimum Xc was 44.2%, when DC bias was 150V, and the maximum Xc was 48.9%, when DC bias reached to 200V. With Xc increased from 44.2% to 48.9%, absorption and extinction coefficient were increased near 400nm and the optical band gap decreased from 1.64eV to1.96 eV. photo absorption coefficient and extinction coefficient on the same sample turned out a declining curve as wavelength is more than 400nm, The difference of absorption coefficient and extinxtion cosfficient at the same wavelength, optical bang gap were caused by dangling bongs concentration and the effective carrier concentration, density level of films with different Xc .
综述
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  Fabrication and Research and Application of Piezoelectric Materials

  . 2010, 41(S1): 47-0.

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  Abstract:This paper begins with the piezoelectric effect and introduces the classification and structure of piezoelectric materials.Considering the application of different piezoelectric materials in the production practice，preparative techniques of piezoelectric material in the current stage are listed。Research actuality of piezoelectric materials is summaried. application and development of the piezoelectric materials in various fields are also introduced systematically.