30 November 2014, Volume 45 Issue 22

    

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综述 进展
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  Research progress on graphene/demdrimers composites

  ;MO zun li ;;;

  . 2014, 45(22): 1-0.

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  Graphene/demdrimers composites has been attracting more and more attention from nanomaterial science due to its unique structure and outstanding properties. In this review, we present the current status in the studies for the preparation of graphene/dendrimers composites and its application in the field of sensors，catalysis and other areas in recent years. The main research direction and development trend are also discussed.
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  The Progress in Exploration of Organosiloxane Used in the Electrolyte to Improve the Lithium Batteries’ Safety Performance

  . 2014, 45(22): 2-0.

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  Organosiloxane has a high-temperature resistant and stable character which is the result of its structure. Introducing organosiloxane into the electrolyte of lithium batteries, the safety performance will be improved significantly. In this paper, recent research progress on application of organosiloxane in polymer electrolyte and liquid electrolyte is systematically reviewed, including serving as the component of polymer electrolyte, as well as solvent or additives in liquid electrolyte. Besides, the results of our research team focus on the exploration of new organosiloxane compounds for li-ion batteries electrolyte in late years are elaborated. Furthermore, the current problems and the corresponding research directions are also discussed.
工艺 技术
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  Preparation and Characterization of Magnetic Polymer Microspheres Containing Rosin-acrylic Ester

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  . 2014, 45(22): 3-0.

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  Styrene (St) was used as main monomer, acrylic rosin-hydroxyethyl methacrylate (HEMA) ester (RAH) as curing agent, oleic acid modified Fe3O4 as magnetic material, magnetic polymer microspheres with rosin moiety were prepared via suspension polymerization. The level of the modified Fe3O4 on the performance of the particles was explored. The structures and properties of the magnetic polymer microspheres were characterized by fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectrum, thermal gravimetric analysis, and vibrating sample magnetometer, respectively. The results indicated that the magnetic polymer microsphere [P(St/RAH)/Fe3O4] containing rosin moiety were successfully prepared. The Fe3O4 particles were embedded within the microspheres. The microspheres showed spherical shape with smooth surface, paramagnetic, when the level of oleic acid modified was 8 wt.% (based on monomer), the saturation magnetization reached to 3.13 emu/g.
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  Study on process of preparing monodisperse and spherical micro-size silver powders by reduction method with ammonium ferrous sulfate

  Yaoi-Bin Lai ;;

  . 2014, 45(22): 4-0.

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  In order to improve the smoothness and uniformity of silver powders, monodisperse and spherical micro-size silver powders were prepared by chemical reduction method with tween-65 (TW65) as surfactant, ammonium ferrous sulfate as reductant and silver nitrate as metal source. The effects of reductant concentration, reaction temperature T, surfactant dosage on particle size of silver powders were investigated. And the formation mechanisms of silver powders were discussed. The optimum condition is: T, room temperature; the molar ratio of reductant and AgNO3, 6:1; and the mass ratio of TW65 and AgNO3, 5%. The uniform monodisperse spherical silver powders with a mean particle size of 1.8μm, apparent density of 2.4 g/cm3, tap density of 4.9 g/cm3 and recovery percent of 99.56% were prepared under the optimum condition, basically meeting the requirements of the silver powder used for solar cells.
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  Preparation and application of Fe-Ni alloy nanoparticles coated by SiC/SiO2

  Wei-Min SUN

  . 2014, 45(22): 5-0.

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  Fe-Ni alloy nanoparticles were prepared by arc discharge evaporating Fe-Ni alloy in 15%CH4 ＋10%SiH4＋75%Ar atmosphere. The magnetic lubricating oil was prepared by Fe-Ni alloy nanoparticles as magnetic particle, oleic acid as surfactant, lubricant as base solution. The phase structure, morphology, size, surface layer and oxidation resistance of the nanoparticles were studied using X-ray diffraction(XRD),transmission electron microscopy(TEM), X-ray photoelectron spectroscopy (XPS),infrared spectrum(IR), oxygen content analysis.The viscosity and saturation magnetization of magnetic lubricating oil were studied using viscometer and vibrating sample magnetometer (VSM).
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  RESEARCH ON THE ANTI-DEFORMATION OF POLYMER MODIFIED ASPHALT BINDER AT HIGH TEMPERATURE

  Wang-Lan ;

  . 2014, 45(22): 6-0.

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  In order to investigate the effect of short-term aging (film oven aging) and temperature on anti-deformation of different kinds of asphalt including SBS modified asphalt (SMA), rubber powder modified asphalt (RPMA) and composite modified asphalt (CMA), repeat creep recovery test was conducted by the dynamic shear rheometer(DSR), the anti-deformation index-HL（calculated by complex shear modulus- G*）and viscous part of complex shear modulus-GV was used to evaluate the anti-deformation of these kinds of asphalt respectively. In addition, scanning electron microscope (SEM) was used to observe the microstructures of these kinds of asphalt, the reasons why there are different performances among them about anti-deformation were explained from microscopic view. Results show that: GV and HL can evaluate the anti-deformation of modified asphalt under high temperature properly; the microstructure of matrix asphalt and modifier were changed after short-term aging, so their anti-deformation changed; the influence of temperature on anti-deformation of modified asphalt depends on the temperature sensitivity of asphalt, RPMA has the best anti-deformation under high temperature.
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  Preparation of PET-based near-infrared absorption filter and its NVIS compatible properties

  Kai-Yuan YANG

  . 2014, 45(22): 7-0.

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  Abstract: A flexible PET-based near-infrared absorption filter well suited for night vision imaging system (NVIS) compatible lighting was prepared by using PET film and acrylic resin as substrates, NIR-dyes NIR736 and NIR865 as function additives through solvent mixing method. The absorption characteristics of NIR736 and NIR865 were studied and the optimal contents of them were determined. The UCS chromaticity of the filter was adjusted to (0.165, 0.508) within the area of night vision white circle. The experimental results showed that the transmittance of the filter in the wavelength of 400~625 nm and 665~930 nm was 22.35% and 0.14%, respectively. Besides, the filter kept stable optical performance after high temperature aging test, low temperature aging test and light aging test, which indicated that the actual application performance of the filter is good.
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  Electrochemical preparation of multi-functional coating for medical external application on Al alloy

  DENG SHU-HAO ;;

  . 2014, 45(22): 8-0.

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  Multi-functional coating for medical external application on Al alloy had been prepared by anodic oxidation and electrolysis coloration, and the optimum condition of electrolysis coloration process was confirmed by orthogonal design，and the pore sealing process by TiO2 was adopted. X-ray diffraction (XRD) and scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to study the structure, appearance, and ingredient of film. Other properties such as corrosion-resistance, anti-wiping resistance, hydrophilicity, photocatalysis and antibacterial property were investigated. A brick red oxidation film with multi-function, such as corrosion resistance, sterilization and self-cleaning, has been got for medical external application. The results demonstrate that the thickness of the multi-functional coating is about 40~50μm and the main phase of the coating is amorphous Al2O3, Nano-size Cu particle is electrodeposited in bottom of film hole. The properties of cating sealed with TiO2, such as anti-corrosion, self-cleaning, hydrophilicity and sterilization are better than those of coating sealed in boiling water.
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  TiO2 Nanotube Arrays Made by Magnetron Sputtering and The Fabricated Hybrid Solar Cells

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  . 2014, 45(22): 9-0.

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  TiO2 nanotube arrays were made by DC magnetron sputtering- heat treatment two step method. Then, the nanotube arrays were transferred onto the ITO substrates, and were fabricated to hybrid solar cells with P3HT and P3HT:PCBM, respectively. Scanning electron microscopy, X-ray diffraction, energy dispersive spectrometer and photovoltaic measurement system were used to characterized and analyzed the TiO2 nanotube arrays and the corresponding solar cells. The best conversion efficiency was obtained from the P3HT:PCBM/TiO2 nanotube based solar cell with a TiO2 binding layer between the nanotubular film and the ITO substrate. The two step method shows a great potential in the commercial application of the polymer solar cells.
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  Effect of Cu2+ Addition on the Crystal Structure and Infrared Emission Properties of Mn1.5Cr1.5O4 Materials

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  . 2014, 45(22): 10-0.

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  Abstract：The Cu2+ doped spinel Mn1.5Cr1.5O4 powders were fabricated by the traditional solid state reaction at the temperature of 950°C. The thermal analysis, X-ray powder diffraction (XRD), infrared transmittance spectra (IR), Raman spectra and infrared emissivity at the range of 3-5um, 8-14um, and 1-22um were examined by different methods. Effects of the different amount of Cu2+ on the the state of existence of the Cu2+ ions on the crystal structure of Mn1.5Cr1.5O4 and infrared emissivity and were investigated. It is found that the the Cu2+ stay the tetrahedral sites in the structure, and the infrared emissivity increase with the increase of the amount of Cu2+ , when the Cu2+ is about 30% , the powders have the highest emissivity with 0.946 at the range of 1-22 μm , 0.937 at 8-14 μm and 0.929 at 3-5μm.
研究 开发
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  The Study on The Permanent Permeability performance of Fe78Si9B13 magnetic cores with air gap

  Zhenghou Zhu ;;Qin Hu

  . 2014, 45(22): 11-0.

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  The magnetic property of Fe78Si9B13 with air gap and the influence factors of that under the condition are mainly studied. And the concept of air void ratio is introduced. Besides, though testing, we get the curves that the equivalent permeability of Fe78Si9B13 cores with different air void ratios changing with DC magnetic field. The results show that air void ratio is the key factor of the equivalent magnetic permeability and Hj of Fe78Si9B13 magnetic cores under the large magnetic field. Heat treatment process and structure of magnetic cores have a certain influence on the equivalent magnetic permeability and the value of Hj under the large magnetic field with the same of air void ratio, which influence degree is associated with the ratio of air void. When the air void ratios are respectively 1%, 3%, 5%, the equivalent magnetic permeability and the value of Hj are respectively 155 and 6500 A/m, 87 and 8500 A/m, and 65 and 10500 A/m.
工艺 技术
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  Preparation of silica thin films with controllable refractive index and preparation of environment-resistant broad-band AR coating

  Xin-Xiang ZHANG ;;;

  . 2014, 45(22): 12-0.

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  Antireflective (AR) coatings with controllable refractive index were prepared by sol-gel process. Acid-catalyzed and base-catalyzed silica sols were preparedfrom TEOS with HCl and ammoniaas catalyst, respectively. The AR coatings were prepared from mixed sol with different content of acid-catalyzed silica by dip-coating process. It was found that the AR coatings possessed controllable refractive index from 1.18 to 1.44. A broad-band AR coating effective simultaneously at 527 nm and 1053 nm was prepared by using AR coating with refractive index of 1.41 as bottom layer and AR coating with refractive index of 1.18 as upper layer. Finally, the hydrophobicity and environment-resistance of broad-band AR coating were improved after the surface modification of AR coating with hexamethyldisiloxane (HMDS) as modifier.
研究 开发
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  Study on Properties of TiO2 Photocatalysts Doped with S

  . 2014, 45(22): 13-0.

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  S doped TiO2 powder (S-TiO2) were synthesized by sol–gel method. The obtained samples were characterized by XRD、Nano-series Sizer 、FT-Raman、UV-Vis、PL, respectively. The results show that S-doping can inhibit the TiO2 phase transition anatese to rutile, reduce the reunion between the particles, broaden the absorption spectrum to the visible light region, and inhibit the recombination of photoelectron-hole pairs. The experiments of photocatalytic degradation of methylene blue (MB) indicate that the photocatalytic activity of the S-TiO2 powder prepared at S∶Ti=0.14(molar ratio) and the calcinated temperature of 450℃ is the best. Under the fluorescent light irradiation, the degradation rate of the S-TiO2 sample to methyl blue reaches 74.12% for 3 h, which is obviously higher than 31.89% of P25 TiO2 photocatalyst which made in Degussa, German.
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  Properties and Preparation of High Hydrophobic PVDF Porous Membrane by Non-solvent Induced Phase Inversion Using Etched alloy aluminum surface as Substrate

  Zhi-Ying WANG

  . 2014, 45(22): 14-0.

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  Abstrac: Polyvinylidene fluoride (PVDF) membranes were fabricated by non-solvent induced phase inversion with the system of PVDF/N,N-dimethylacetamide(DMAc) and 1-octanol/water. DMAc and octanol were used as solvent and non-solvent addition, respectively. In this method, the polymer dope solution was cast on etched alloy aluminum template and the membrane was staying in an environment of constant temperature and relative humidity was about 90% for a certain time. Then it was immersed into water coagulation bath. Effects of the substrate on morphology, performance and crystallization of PVDF membrane were investigated. It was found that the crystallinity and roughness of membrane bottom surface increased which was tailored on etched alloy aluminum template compared to that on smooth glass sheet. The water contact angle on the bottom surface of the membrane prepared on etched alloy aluminum template reached as high as 133° and the hydrophobicity was stable with time. It was revealed that the membrane could be anchored to the alloy aluminum template, so that the mass transfer rate between solvent and nonsolvent decreased and liquid-solid demixing was promoted. The micrometer-sized morphology of etched alloy aluminum substrate provided induced crystallization. The above-mentioned opinions were confirmed by wide-angle X-ray scattering. The characterization of the PVDF membranes obtained by using etched alloy aluminum substrate and waterproof abrasive paper was carried out by a nitrogen flux measuring and a mechanical property test. It was shown that the highly hydrophobic PVDF membrane prepared with etched alloy aluminum substrate was more suitable for industrial-scale production.
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  Preparation and analysis of superhydrophobic SiO2-PTFE composite coating

  wang ;De-yuan ZhanHua-wei Chen

  . 2014, 45(22): 15-0.

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  Sol-gel is used to prepare nano-SiO2 particles which have uniform particle size (250nm) and good monodispersity. By controlling the ratio of the mass fraction, SiO2 particles-aqueous solution and PTFE emulsion are mixed into hybridized emulsion; spin-coating method is used to form film and heat-treat it under 380℃, we can get the composite coating of micro-nano double-decker structure and surface morphology similar to lotus leaf. It has good super-hydrophobic properties; the experimental process is simple, low cost, and has a certain practicality.
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  The Influence Of Carbon Nanotube Draw Ratio On MWNTs/PI Composite Film Dielectric Performance

  . 2014, 45(22): 16-0.

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  The different draw ratio of MWNTs treated by mixed acid oxidation method were acquired by the different dealing time, and the morphology of treated MWNTs were observed by SEM. The different draw ratio MWNTs were doped into MWNTs/PI composite film. The effect of the draw ratio of MWNTs on the percolation threshold value and the dielectric constant of MWNTs/PI composite film were predicted by size exclusion theory and percolation theory respectively, and measured the fact value of percolation threshold and dielectric constant of of MWNTs/PI composite film, then analyzed the reason of difference between theory prediction and experiment measured result.
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  Preparation and characterization of LiFePO4 /C composite by a new spray drying method

  ;;;Bao-Hua LI

  . 2014, 45(22): 17-0.

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  A nano-sized LiFePO4/C composite with micro-spherical particles was synthesized by sintering the spherical precursor powders prepared using a new spray drying assisted method. In the first way, nano-sized FePO4 with size of 20nm was prepared and well mixed with Li2CO3 and certain mass of sucrose to obtain the precursor, after carbon coating and spray drying processes, a micro-spherical precursor powder was gained, which was followed by a certain thermal treatment, to achieve the preparation of the secondary particles of LiFePO4/C composite consisted of primary ones. The effects of carbon content on the performance and morphology of secondary particles were investigated. It is found that the optimal carbon content is 5.3wt%, and the sample delivered a good morphology structure and the highest specific capacity of 162 mAh/g, 145 mAh/g and 116 mAh/g at the rates of 0.1C, 1C and 5C respectively.
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  Controlled synthesis and characterization of core-shell fluoro-silicone-containing fabric agent

  Chun-Xiang LIN;;; ;

  . 2014, 45(22): 18-0.

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  The core-shell particles containing fluorine-silicon polymer was prepared by Activators Regenerated by Electron Transfer Atom Transfer Radical Polymerization(ARGET -ATRP) using SiO2-Br as initiator. The obtained polymer with well-controlled molecular weight and low polydispersity was used as water and oil repellent fabric finishing agent. Kinetics of the polymerization showed the polymerization was a living/controlled system. Characterization of FTIR, 1H NMR, 19F NMR, XPS, TEM confirmed the core-shell structure of the polymer and the presence of F element. The formation of dual micro-nano structure between nano polymer and the surface of fabric enhanced the water and oil repellency of the cotton fabric.
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  The effect of the AFM layer thickness on the magnetic properties of Co/Pt/FeMn multilayers with perpendicular magnetic anisotropy

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  . 2014, 45(22): 19-0.

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  A set of Pt(40 ?)??Co(5 ?)?Pt(3 ?)]3?FeMn(tAF ?) multilayer samples deposited on the Si(100) wafer at room temperature was prepared using an ultrahigh vacuum magnetron sputtering system. We have studied the effect of the AF layer thickness tAF on the magnetic properties of Co/Pt/FeMn multilayer films with out-of-plane magnetic easy axis. X-ray magnetic circular dichroic (XMCD) measurement was performed by using the remnant magnetization of the samples at room temperature. The result shows that the net magnetic moment of the FeMn, which mainly originated from Fe, exists at the FM/AFM interface only, and the moment of Fe tends to be perpendicular to the sample plane. In the results of magnetic measurement，the exchange bias, HEB, increases gradually and then flatly, meanwhile the coercivity, HC, increases first and then decreases slightly with increment of the FeMn layer thickness. Both HEB and HC are almost unchanged after tAF goes beyond about 75?. The training effect has not been observed in the samples.
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  Effect of FeOx on the Performance of Mn-Ti Complex Oxide Catalysts for the Catalytic Combustion of Chlorobenzene

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  . 2014, 45(22): 20-0.

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  In this study, a series of MnOx-TiO2 and FeOx-MnOx-TiO2 catalysts were prepared using a sol-gel method and were investigated for the catalytic combustion of chlorobenzene (CB). The result revealed that FeOx-MnOx-TiO2 catalysts exhibited a relatively higher catalytic activity than that of MnOx-TiO2 catalysts. Moreover, a remarkably higher stability was detected for the FeOx-MnOx-TiO2 samples compared with Mn-Ti catalysts, indicating that the stability of MnOx-TiO2 samples could be enhanced by the addition of Fe. The synthetized catalysts were characterized using H2 temperature-programmed reduction(H2-TPR), X-ray photoelectron spectroscopy(XPS), Brunauer-Emmett-Teller(BET) surface measurement, and X-ray diffraction(XRD) .Characterization of the catalysts revealed that the appropriate addition of FeOx to the MnOx-TiO2 catalysts would increases the specific surface area of the catalysts , which promotes the dispersion of Mn species over the TiO2 supports. In addition, the introduction of Mn also increase the amount of active oxygen species on the catalyst surface and lattice oxygen, which would in turn significantly enhance the oxidation abilities of catalysts. All of above reasons account for the higher catalytic activity and stabilities of FeOx-MnOx-TiO2 catalysts.
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  Synthesis,characterization and properties of tetramethylammonium dibenzylcarbamodithioate

  . 2014, 45(22): 21-0.

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  Sodium dibenzylcarbamodithioate can be synthesized by dibenzylamine ,NaOH and CS2 as starting materials, THF as solvent.Then the Sodium dibenzylcarbamodithioate is used to react with tetramethylammonium chloride to get novel ionic salt accelerator—tetramethylammonium dibenzylcarbamodithioate. The structure of the compound was confirmed by fourier transform infrared (FT-IR) spectroscopy, nuclear magnetic resonance(NMR）spectroscopy, mass (MS) spectroscopy and elemental analysis techniques. In order to study the properties of the novel accelerator-tetramethylammonium dibenzylcarbamodithioate and TMTD were added to the natural rubber latex,and made a kind of different Rubber diaphragms,and swell index(SI), mechanical properties were also determined. The results indicated that, tetramethylammonium dibenzylcarbamodithioate which has good properties of accelerant is a kind of excellent natural rubber accelerator of green environmental protection.
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  Absorption capacity of carbon dioxide on Mg/Al layered double hydroxide with deionized water adding during amine modified process

  . 2014, 45(22): 22-0.

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  The preparation of the organic surfactant (sodium laurylsulfonate) intercalated Mg/Al layered double hydroxides (Mg/Al LDH) were prepared via a co-precipitation method. Then an exfoliation and grafting method was utilized for synthesizing amine modified Mg/Al LDH. The materials were characterized by element analysis, X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. The adsorption behavior and the adsorption-desorption regeneration experiments for these layered double hydroxides was investigated by TGA at 30°C and one bar pressure. In the process of amine modified, a amount of deionized water was aided during exfoliation. The influence rule of the amount of water with amine loading and CO2 absorption capacity were particularly studied. The results show that the optimum amount of deionized water of 3- (Trimethoxysilyl) propylamine and N-(amino-ethyl)-amino-propyl trimethoxy silane was both 0.1ml/g with the adsorption capacity of 1.21mmol/g and 1.02mmol/g for sample Mg/Al 0.1 N1 and Mg/Al 0.1 N2 in pure CO2 at 30°C.
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  Influence of Organic Solvent/Ionic Liquid Mixture System on Solubility of Cellulose

  . 2014, 45(22): 23-0.

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  A complex solvent with reduced viscosity was established by mixing ionic liquid and the protic organic solvents. The dissolving and solution property of cellulose in the complex solvent was studied. Results demonstrated that DMSO, DMF, and DMAc can effectively reduce the viscosity of the mixing system. The viscosity is fell by almost half when the mass fraction of 20% organic solvent. And the viscosity of the mixing system of the three organic solvents decreased 50%. But the optimum solubility of cellulose was gained in the mixing system with a mass ratio of DMSO/ [Emim]Ac 20%. The solubility of the pine cellulose with a high polymerization degree of 1460 increased from 5.0g/100g to 7.5g/100g when 20%(w/w) DMSO was added to [Emim]Ac at 90oC,dissolution time reduced. It was confirmed by the infrared spectra that cellulose can be uniformly dissolved in the DMSO/[Emim]Ac mixture without derivation.X-ray diffraction spectra indicated that crystalline form of pine cellulose transformed completely from type Ⅰ to type Ⅱ after regeneration from ethanol.
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  Investigation of A Primary Li Cell whose Cathode was Made of the Mixture of Fluorinated Carbon and Electrolytic Manganese Dioxide

  Kai YANG

  . 2014, 45(22): 24-0.

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  Abstract: Both the fluorinated carbon (CFx) and electrolytic manganese dioxide (EMD) would exhibit their discharging capacity perfectly, where the two kinds of material are mixed up as the cathode in a primary Li cell. And the order of discharge in the whole discharge process is the EMD firstly, and then both the two materials, finally the CFx. We could demonstrate that there are no by-products in the discharge process through the analysis of SEM and XRD. The discharge performance of CFx and EMD as the mixed cathode of Li primary cell is independent, and the two materials are non-interfering with each other in the discharge process.
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  Synthesis, NMR, and Spectroscopic Properties of A Novel Fluorene-based Derivative with D-π-A structure

  Song ZHANG

  . 2014, 45(22): 25-0.

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  A new type of fluorene derivative, 2-(2,4-difluorophenyl)-7-(4-methoxyphenyl)-9, 9-dioctylfluorene(compound 1) was synthesized and characterized by elemental analysis, IR spectra and NMR Spectroscopy. Its optoelectric properties were measured by UV-Vis absorption spectra and fluorescence spectra. The results show that compound 1 has low-energy absorption bands ranging from 350 nm to 400 nm in dichloromethane solution, which can be assigned to the π-π* charge transfer transitions. The optical band gap (Eg) of compound 1 is estimated to be 3.39 eV. The title compound exhibits strong blue photoluminescence under 310 nm excitation at room temperature. The fluorescence quantum yields of compound 1 in CH2Cl2 is up to 0.70.In addition, the wavelength of the absorption and emission spectra of compound 1 depend on the polarities of the solvents.
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  Preparation and Adsorption Properties of Copper(II)Ion Imprinted Polymer

  . 2014, 45(22): 26-0.

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  A new Cu2+-imprinted polymer was prepared using 4-vinyl pyridine and acrylamide as bio-functional monomers, ethylene glycol dimethacrylate as crosslinking agent. The structure and morphology of Cu2+-imprinted polymer and non-imprinted polymer were characterized by fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM)，The adsorptive, desorption properties and the selectivity recognition ability of Cu2+-imprinted polymer were investigated. The results indicated that the adsorption capacity reached equilibrium after 10 min at pH 6.0. Using 0.3 mol / L HCl as desorption solvent, the desorption rate was more than 96% after 3 min. The Cu2+-imprinted polymer had excellent adsorption and selective recognition properties compared with non-imprinted polymer. The maximum adsorption capacity of Cu2+-imprinted polymer was found to be 15.67 mg/g, the enrichment factor could be up to 50 times.
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  Adsorption of Pb2+ and Cd2+ from aqueous solutions by lignocellulose-g-acrylic acid/acrylamide/montmorillonite nanocomposites

  Gang CHEN;Li Wang

  . 2014, 45(22): 27-0.

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  The ligoncellulose-g-acrylic acid/acrylamide/montmorillonite (LNC-g-AA/AM/MMT) nanocomposites were prepared by a in situ intercalated polymerization method, it was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of several experimental conditions including metal ions initial concentration, adsorption time, adsorption temperature and solution pH were examined. The maximum uptake of Pb2+(504.2mg/g) and Cd2+(246.9mg/g) were observed when used 0.04mol/L of Pb2+ and 0.06mol/L of Cd2+ concentration, at adsorption time of 120 min and 60 min, and at adsorption temperature of 40℃ and 30℃, under pH 5.5. All absorption processes were in good agreement with the Langmuir isotherm and the Pseudo-second-order kinetic model, is a spontaneous exothermic reaction process. The desorption process showed that the maximum desorption percentage reached 93.4% and 92.9%, respectively.
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  Adsorption properties of polyaniline doped with mixed acids for Cr(Ⅵ)

  . 2014, 45(22): 28-0.

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  The polyaniline co-doped with hydrochloric acid (HCl) and p-toluenesulfonic acid (TSA) was prepared by in-situ polymerization method. The properties of the synthesized polyaniline were studied and characterized by Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR). The effects of various experimental conditions such as pH, time, temperature and initial metal ion concentration were studied. The results show that, at the room temperature, the mol concentration ratio of TSA to HCl was 9:1, the morphology of the synthesized doped polyaniline was loose nanorods. Isotherm data fits well to the Langmuir model and se-cond-order kinetic model. The maximum adsorption capacity for Cr(VI) is 413.22mg/g at pH 2 and 50℃．
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  Experimental Study on the hydrothermal synthesis of Iron Vanadate

  Qiang GAO ;;

  . 2014, 45(22): 29-0.

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  The study prepared crystalline FeVO4 by hydrothermal synthesis, X-ray diffraction analysis (XRD) and SEM were performed to investigate the effect of pH and reaction temperature on precipitates, investigates the influence of the solution pH value and reaction temperature on the precipitation. The results indicated: n(V)/n(Fe) ratio of samples decreased with the increase of pH value; the best conditions of hydrothermal synthesis obtained were reaction temperature at 160℃, pH 1.5~4, n(V)/n(Fe)=1, and the standing time of 120min, under such condition, the V/Fe molar ratio of precipitates was 1 and the precipitates were regularly spherical in the shape with fine grain size.
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  Preparation of Silver-Carried Chitosan and Its Antibacterial Effect on Veneer

  Si-Qi Huang;Zhi-ming YU

  . 2014, 45(22): 30-0.

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  Chitosan (CTS) and AgNO3 solution were used to prepare antibacterial agent, i.e. silver-carried chitosan(CTS-Ag), by reacting under dark, heating and acid conditions, and their resulted morphology, structure, and chemical groups were obtained by using SEM, FTIR, XRD and Elemental Analyzer. The antibacterial property of CTS-Ag treated veneers with impregnating in normal temperature and pressure were specific evaluated by colony counting method. A CIE L*a*b* (1976) color system investigated the effect of CTS-Ag on veneer’s colors. The results showed that: coordination reaction took place between -NH2 and Ag+ (ratio 2:1), generating CTS-Ag. The crystallinity of CTS were decreased obviously, while the antibacterial properties of CTS-Ag were superior to CTS or Ag+. CTS-Ag could improve the light resistance of Ag+, it had no significant influence on the color for veneer.
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  Study on Relations between Microstructures and Electret Properties for SiO2 film

  . 2014, 45(22): 31-0.

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  Since it possesses excellent advantages such as the outstanding ability of charge storage, the compatibility of device-making with the standard lithography in micro-electron-mechanical process, and the suitability for the integration manufacture, the SiO2 film electret is the hot research point in the micro-device and sensor fields. In this paper, the electret properties of the SiO2 films, prepared by electron evaporation and PECVD methods, were studied by using the corona charging and surface potential testing technologies. It was found that the electret property of the sample prepared by PECVD method was distinctively better than that of the sample prepared by electron evaporation method. The micro-structures of the SiO2 thin films were analyzed by scanning probe microscope, X-ray diffraction and Raman analysis equipments, it was found that the electret property was tightly correlated to the micro-structure of SiO2 thin film. The SiO2 film prepared by PECVD method is composed of nanoscale amorphous particles and possesses a great deal of particle interfaces, these interfaces serve as charge traps and the existence of these interface traps is the fundamental reason for the even better charge store stability of the film.
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  Preparation and properties of controllable thermosensitive superabsorbent

  Xiao-Yun ZHANGXiang-Peng WANG;;

  . 2014, 45(22): 32-0.

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  A novel controllable thermosensitive superabsorbent was prepared by aqueous solution polymerization of sodium acrylate, using tetraallylammonium chloride (TAAC) and N, N-methylenebisacrylamide (NMBA) as compound crosslinkers. The factors such as quantity of compound crosslinkers, molar ratio between TAAC and NMBA and temperature on water absorbency were studied. The results showed that the swelling ratios at low and high temperature were apparently different，which can be controlled by the quantity of compound crosslinkers and the molar ratio between TAAC and NMBA. Besides, the superabsorbent was sensitive to temperature, which the swelling ratio and rate can be controlled by temperature.