bluuebunny/crossref_metadata_2025 huggingface dataset:
The Molecular Orientation in Monomolecular Layer of Synthesized Porphines-ZnTPP and Copper (II) Phthalocyanine
Authors: Bian Feng Ling , Chen Yong Jian , Cui Hai Ning , Wang Hai Shui , Xi Shi Quan
Published: December 2014

Systematic research on Monomolecular Layer of Copper (II) Phthalocyanine (CuPc) and porphyrin (Por) derivatives bas been done. In this paper an attention is focused upon the molecular orientation in monomolecular layer of some symmetrically and asymmetrically substituted CuPc and Por by means of the surface pressure-area (π-A) isotherm method, the transmission electron micrographs (TEM) , polarized UV-visible spectra.
Synthesis and Photocatalytic Activity of Silicon-Substituted Hydroxyapatite
Authors: Liu Ke Jun , Yu Hua Guang
Published: December 2014

Series of silicon-substituted hydroxyapatite were prepared and characterized, and their ability to degrade methyl orange and Congo red in aqueous solutions were studied. The effect of substituted silicon amount on the photocatalytic degradation efficiency of the dyes was investigated. The substitution of SiO44− groups for PO43− groups caused OH− loss and difference in the microstructure of hydroxyapatite, and the elimination rates of silicon-substituted hydroxyapatite decreased with the increasing of substituted silicon amount compared to that of pure hydroxyapatite.
The Preparation of CdTe-Fe3O4@CS Nanoparticles and its Application for Drug Carrying
Authors: Wang Li , Mao Xu
Published: December 2014

Novel multifunctional core shell structure CdTe-Fe3O4@CS drug nanocarriers were developed. The water soluble Fe3O4 nanoparticle was prepared by chemical coprecipitation method. The highly fluorescent CdTe QDs were prepared by refluxing method. The prepared Fe3O4 and CdTe QDs nanoparticles were capped with chitosan by ionic gel method to form multifunctional nanomaterials. After processing parameters affecting the end product properties were systematically optimized, folic acid, a model drug, was successfully incorporated into the polymeric complex.
Microbial Bioconversion Process of Glucose for the Production of Xylitol
Authors: Qi Xiang Hui , Luo Yan , Zhu Jing Fei , Zhang Huan Huan , Wang Xu , Lin Jing , Chen Fang , Ju Zhao , Wang Liang
Published: December 2014

Xylitol is the first rare sugar that has global market because of its excellent properties. Considering its superiority to chemosynthesis, biosynthesis of xylitol became hot issue in recent studies. The production of xylitol from glucose experienced a development from three-step process to two-step process, or even only one-step process. The microbial and enzymatic process involving key enzymes, molecular cloning and expression and transgenic bacteria construction is introduced in this paper. This study may provide novel thought to explore new resource for better control of biological reaction conditions and obtainment of higher xylitol yield.
Study on Synthesis and Catalysis Application of Nano-Au/C Catalyst
Authors: Li Zi Jing , Jiang Yan , Sun Li Da , Feng Shao Ping , Xiao Rui Min , Lu Shun Li , Huang Du Shu
Published: December 2014

The size controlled colloidal gold nanoparticles were prepared by sodium citrate photochemical system. The size and morphology of the gold nanoparticles were characterized by TEM and UV-Vis spectroscopy. nanoAu/C catalysts were obtained by loading the gold nanoparticles. The catalysts were used for the catalytic oxidation reaction of glyoxal and glucose in liquid phase. The research results showed that the catalysts had higher catalytic activity, and this preparation method is successful.
Pharmacology Research Progress of Paeonol
Authors: Guo Qi , Zhao Chuan Xiang , Zhang Shi Qing , Ju Zhao , Chen Fang , Tian Xin , Yang Ao Ran , Wang Ping , Fang Li , Guo Jie , Wang Zhi Guo , Xu Hua Xi
Published: December 2014

Paeonol is one of main medicinal ingredients of Cortex Moutan. Paeonol has the functions of sedative, hypnosis, anti-bacterial, antibiosis, anti-inflammation, antioxidation, reducing blood pressure and so on. Paeonol has extensive biological activities and has broad prospects of exploitation and utilization. This paper reviews the latest progress of its pharmacology.
The Preparation of Multifunctional Fe3O4/Au Nanoparticles and its Application to Mercury(II) Analysis
Authors: Yuan Qiu Xiang , Shao Chuan Cai , Liang Guo Xi , Wang Li
Published: December 2014

This work is directed towards the synthesis of multifunctional nanoparticles of Fe3O4/Au nanocomposite, aimed at ensuring the magnetic and optical properties of magnetic-gold nanocomposite simultaneously. The nanoparticles showed good response to externally applied magnetic fields. The UV–vis spectroscopic examination reveals the maximum adsorption at ∼400 nm. Finally, the Fe3O4/Au nanoparticles were applied for detection mercury (II) ions in water solution.
Surface Modification of Nano-Silica with Silane Coupling Agent
Authors: Xu Min Hong , Cao Yong Yong , Gao Shun Guo
Published: December 2014

Surface modification of nanoSiO2 was carried out in ethanol solution with two different silane coupling agents, 3-aminopropyltriethoxysilane (KH-550) and 3-methacryloxypropyltrimethoxysilane (KH-570), respectively. The structure and performance of modified nanoSiO2 were analyzed by infrared spectroscopy, surface hydroxyl number and conductivity. The influence factors as stirring time, temperature and modifier amount on modified performance have been discussed. The results shown that optimal modification conditions with KH-550 and KH-570 were as follow: temperature 75 oC, stirring time 4 h and the modifier 5% (w/w). Surface hydroxyl numbers were 0.7826×1020/g and 0.7525×1020 /g, conductivity were 32μs/cm and 92μs/cm, respectively. The modification effect of nanoSiO2 with KH-550 was better than KH-570.
Study on Microstructure and Properties of Cr3C2/Fe Coating Prepared by Arc Spraying on Copper Surface
Authors: Li Hui , Jiao Lei , Hua Si Ming , Xie Chun Sheng
Published: December 2014

In this paper the new process of arc spraying was researched on CuCo2Be alloy surface,the high strength and high wear resistance Cr3C2/Fe coating were prepared on CuCo2Be alloy surface by adopting a series of different arc spraying process parameters. Based on the test the arc spraying process parameters was optimized, the optimized result was: spraying voltage was 38V, the current is 180A, spraying distance was 150mm, spraying air pressure was 0.7MPa, the bonding strength of the coating and the substrate was 30.5MPa; and the thermal shock resistance of coating Cr3C2/Fe was studied in detail by different spraying process parameters, it was showed: thermal shock resistance of the coating was best by spray low voltage and low current process. By using microhardness tester, super depth of field microscope, SEM, EDS and XRD, mechanical properties, microstructure, phase composition and its content distribution of Cr3C2 / Fe coating were studied, the study results were showed: the micro-hardness of coating was 992.75HV, coating was a typical lamellar structure, and a small amount of pore and oxides in the coating; the mainly phase of coating included: Fe, Fe-Cr, C0.14 Fe1.86 and Fe7C3.
Microstructure and Optical Properties during Annealing of DC Magnetron Sputtered LaB6/ITO Films on SiO2 Substrates
Authors: Zhang Lin , Feng Gang , Liu Hui Hui , Min Guang Hui , Wang Dang , Wang Wei , Xu Jing
Published: December 2014

Considering that nanosized LaB6 has unique optical properties and ITO has been widely applied for low-emission window glass, LaB6/ITO composite films were designed and prepared on SiO2 glass substrates by DC magnetron sputtering method in this paper. AFM and HRTEM methods were used for microstructure evolution analysis, and their IR and UV spectra were measured. Results proved that dense LaB6/ITO films with amorphous structure were deposited on the substrate with strong interface bonding. Crystallizing occurred during annealing of amorphous films, and the nanosized grains formed. Compared with the as-deposited films, the annealed films showed improved optical properties. Generally, the glass with the annealed film was available with more than 80% visible light transmittance, and good reflectance on UV light range.
Electrical Properties and Chemical Stability of BaCe1-xMoxO3-δ Proton Conductors
Authors: Xu Jia Huan , Yu Biao , Lin Zhi Xuan , Xiang Jun
Published: December 2014

Dense BaCe1-xMoxO3-δ ceramics were fabricated by sintering at 1450°C for 7h. All samples were characterized by XRD, SEM. All samples were orthorhombic structure. Electrical conductivities of all samples were measured by AC impedance. Electrical conductivity of Mo-doped samples reaches maximum value when doping content of Mo is 5%, which is one order of magnitude greater than that of BaCeO3. Chemical stability of BaCe1-xMoxO3-δ samples was investigated by immersing samples into the boiling water for 12h. The doping of Mo can partially inhibit the reaction between BaCeO3 and H2O.
Performance of Al2 O3 Ceramics with Different Thermal Histories
Authors: Guo Dai Dong , Liu Hui , Liu Shi Quan
Published: December 2014

The mechanic properties mainly the room temperature bending strength and the creep of the Al2O3 ceramic specimens which were prepared by cold isostatic pressing and had undergone different thermal histories have been measured and compared. The results suggest that the bending strength of the ceramic increases after high temperature soaking. The ceramic can withstand cyclic rapid cooling with an initial temperature of 200 °C. The sample has shown a very good dimensional stability after a long service time (50h) at 1550 °C.
Preparation of Nanoparticulate YFeO3 by Ultrasonic Assisted Method and its Visible-Light Photocatalytic Properties
Authors: Tang Pei Song , Tang Chao Wan , Ying Jia Ni , Ni Dong Jing , Yang Qian , Wu Li Mei
Published: December 2014

Using Fe (NO3)3⋅9H2O, Y(NO3)3⋅6H2O and citric acid as the main raw material, the YFeO3 nanoparticles were synthesized by ultrasonic assisted process and calcination. The YFeO3 nanoparticles were characterized by thermogravimetry and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). The results show that the perovskite structureYFeO3 (YFeO3-800) can be obtained through the calcination of ultrasonic processed YFeO3 precursors at 800 °C, and the resulting product has a particle size of 70 nm and an optical band gap of 2.0 eV. Consequently, the YFeO3-800 nanoparticles show high photocatalytic activity for decomposition of methyl orange under visible-light irradiation.
One-Step Preparation of Nanoparticulate TbFeO3 by Microwave Process and its Visible-Light Photocatalytic Activity
Authors: Tang Pei Song , Wang Zhe Hao , Ying Jia Ni , Tang Chao Wan , Yang Qian
Published: December 2014

TbFeO3nanoparticles were synthesized using Tb4O7and Fe (NO3)3·9H2O as the main raw material by a one-step microwave process. The prepared nanoparticles were characterized by thermogravimetric and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR). XRD and SEM demonstrate the successful synthesis of single phase TbFeO3and an average grain size of 40-100 nm in diameter. The single phase structure of TbFeO3was yet maintained after calcination at 800 °C. The photocatalytic experiment shows the high visible-light photocatalytic activity for the decomposition of methyl orange.
Multifunctionalities of Nanocarbon Materials Filled Cement-Based Composites
Authors: Zhang Li Qing , Dong Su Fen , Wang Yun Yang , Han Bao Guo
Published: December 2014

Materials combined with a small amount of nanomaterials offer new possibilities in developing of multifunctional composites. Nanocarbon materials (NCMs) such as carbon nanotubes/ nanofibres, and nanographite platelets have excellent intrinsic physical properties and improvement effect to matrix materials at nanoscale. They are promising fillers for improving the mechanical property and durability of cement-based materials and introducing functional properties to cement-based materials. This paper presents a comprehensive introduction about multifuntionlities of NCMs filled cement-based composites including mechanical properties, durability, electrical properties, thermal properties, electromagnetic properties, sensing property and etc.
Fabrication of Highly Hydrophobic Polyurethane Foam for the Oil-Absorption Application
Authors: Liu Jun , Chang Meng Jie , Tenggeer Menken , Du Hui Ling
Published: December 2014

Hydrophobic polyurethane (PU) sponge for oil absorption application was fabricated by ZnO nanomaterial coating and stearic acid modification on ZnO surface. The contact angle and oil absorbent capacity ability of the obtained sponge were measured. It was demonstrated that both ZnO nanoparticle and ZnO nanorod coated PU sponge (ZnO NPs-PU and ZnO NRs-PU) showed good hydrophobicity and oil absorbent ability. ZnO NPs-PU and ZnO NRs-PU sponges have absorbent capacities of 18~92 times and 20~98 times of their own weight for different organic liquids, respectively. Moreover, the absorption capacity of the ZnO NRs-PU sponge did not deteriorate over 50 cycles. Therefore, the ZnO NRs-PU sponge has excellent recyclability for future application.
Research Development of Preparation Technology of BaTiO3 Nano-Power
Authors: Che Ming Chao , Chen Jie
Published: December 2014

Barium titanate (BaTiO3) used a strong dielectric materials, piezoelectric materials and ferroelectric materials, which is a kind of important electronic ceramic materials. With the miniaturization of electronic components, miniaturization, thin layer, nanosized barium titanate powder become an inevitable developing trend of barium titanate dielectric ceramics material. Some recent new progress for synthesis of barium titanate at home and abroad are summarized, the commentaries are made on the preparation process about advantages or disadvantages. Meanwhile, the analysis is made on the developing trend. Supercritical fluid extraction method have simple process, high extraction efficiency, no organic solvent residual, products of good quality, no environmental pollution, and so on. Research of BaTiO3nanopower may become an important direction of the field in the future.
Effects of Carboxyl Functionalized Carbon Nanotube on the Tensile Strength and Wear Resistance of Epoxy Composites
Authors: Mao Li He , Geng Hong Zhang , Wang Wen Yi , Cui Li Jun , Cui Chang Rui , Xiu Wen Jun
Published: December 2014

Epoxy resin presents 3D cross-linking network structure characteristics after curing, resulting in a lower wear resistance of epoxy resin, which limits its extensive applications. In this paper, the effects of adding carboxyl functionalized carbon nanotubes on the tensile strength and wear resistance of carbon nanotube/epoxy composites were studied. The results showed that the tensile strength and wear resistance of the composites were effectively improved through carboxyl functionalization of carbon nanotubes.
Synthesis of Highly-Ordered V2O5 Nanowires by AAO Template and its Electrocatalytic Activity for Dopamine Electro-Oxidation
Authors: Zhang Kai Feng , Zhou Hui , Li Hu Lin , Sang Rui Peng , Huo Li Xia , Zheng Yu Gang
Published: December 2014

Highly-ordered V2O5nanowires were prepared by sol-gel strategy using anodic aluminum oxide (AAO) as a template. The morphologies, structures and components of the nanowires were characterized by XRD, SEM and XPS. The results indicated high-ordered and uniformly distributed V2O5nanowires were obtained, and the length and diameter were dependent on the diameter and the thickness of the applied AAO template. The V2O5nanowires modified glassy carbon electrode (GCE) was used to investigate the electrochemical properties of dopamine (DA), V2O5nanowires exhibited an excellent electrocatalytic behavior on DA.
Preparation and Characteristic of Different Hollow Microspheres Filled Syntactic Foams
Authors: Jin Xin , Ge He Yi , Wang Ping , Pan Zhong Yuan , Chen Juan
Published: December 2014

In this study, hollow glass microspheres (HGM) and hollow polystyrene microspheres (HPSM) have been employed as fillers in epoxy resin to prepare the syntactic foam. A kind of good performance composite was prepared. The effects of presence of various hollow microspheres on the impact and compressive properties of syntactic foams are studied. Weight fraction of HPSM and HGM for the syntactic foams varies up to 2.0 wt% and 25 wt%, respectively. The results show that the coupling agent can induce the interfacial adhesion between the HGM and the resin and help HGM uniformly disperse in the resin and hence result in better mechanical properties of composite. On the other hand, the effect of HPSM for the composite density is greater than that of HGM. The addition of a small percentage of HPSM helps produce an important improvement in the low density of syntactic foam. The syntactic foam has uniform stability component and the excellent integrative performances. Fabricated syntactic foams had compression strength of 51.96 MPa and density of 0.671 g/cm3.
Influence of FRP Residue on the Properties of Epoxy Based Artificial Granite
Authors: Wu Jian Jun , Liu Ning , Liu Fang Gang , Ge He Yi , Lv Liang Yu
Published: December 2014

Nowadays, how to deal with fiber reinforced plastic (FRP) residue becomes very difficult. In this paper, the characteristic of the production technology of epoxy based artificial granite was considered. Epoxy resin, FRP residue, granites and fillers were used on the study of adding FRP residue and epoxy based artificial granites of different proportion were prepared. They were prepared by casting moulding under the normal pressure and temperature. Flexural and compressive strength of the artificial granites were studied. SEM was used to observe the internal microstructure of artificial granites. Meanwhile, effects of different granularity and content of FRP residue on the properties of artificial granites were discussed.
Synthesis of PbS Nanocrystals by Heterogeneous Reaction
Authors: Zhang Rong Liang , Tang Shu Zhen
Published: December 2014

PbS nanocrystals was synthesized by a heterogeneous reaction of hydrogen sulfide gas and lead nitrate solution containing EDTA in ethanol. The influenceof initial molar concentration ratio of EDTA/Pb (NO3)2 (CEDTA/CPb (NO3)2), volume ratio of ethanol/water (Vethanol/VH2O), pH value and flux of H2S on the particle size of PbS were investigated. The structure, morphology, particle size, and particle size distribution ranges of PbS were characterized by XRD, FE-SEM, and laser particle size analyzer, respectively. Increasing CEDTA/CPb (NO3)2, Vethanol/VH2O, and pH value, as well as decreasing the flux of H2S decrease the particle size of PbS. PbS nanocrystals have an average particle size of 69 nm, a narrow size distribution, and a quasi-spherical shape when CEDTA/CPb (NO3)2 is 1, Vethanol/VH2O is 1, pH is 3.5, and the flux of H2S is 20 ml/min.
Influence of FRP Waste on the Properties of Unsaturated Polyester Resin Based Artificial Marble
Authors: Liu Ning , Liu Fang Gang , Li Guang Jin , Zhang Man , Ge He Yi , Wu Jian Jun
Published: December 2014

There is a lot of glass fiber reinforced plastic (FRP) waste every year. Its low utilization rate and serious secondary pollution cause many problems. In this paper, FRP waste was added to enhance unsaturated polyester resin based artificial marble. The effects of FRP waste content and its particle size on the mechanical properties of artificial marble were discussed. Results show that the FRP waste content and its particle size are closely related to the mechanical properties of artificial marble. The artificial marble with FRP waste particle size of less than 0.075 mm and content of 12.5 wt % got the best mechanical properties, whose flexural strength was 23.72 MPa and compressive strength was 79.13 MPa, increased by 75.8 % and 128.1 %, respectively, compared with the strength of artificial marble with no FRP waste.
Review on Classification and Application Prospect of Ultrafine Powder Material
Authors: Wang Dan , Fan Zi Min , Deng Li Rong , Wang Xiao Gang
Published: December 2014

This paper summarized the basic properties and preparation methods of ultrafine powder, introduced the present situation and progress of ultrafine powder classification technology at home and abroad, also pointed out the application of ultra-fine powder material in the mold manufacturing, biomedical, electronic information, fine ceramics, food industry and coatings.
Langmuir-Blodgett Films of a New Diels-Alder Adduct of C60 with 1,1’-Biindene
Authors: Zhang Yi Qing , Wang Wen Jun , Li Shu Hong , Gao Xue Xi , Zhang Bing Yuan , Liu Yun Long , Wang Qing Ru , Shi Qiang
Published: December 2014

A new Diels-Alder Adduct of C60 with 1,1’-biindene (CB) has been synthesized. The Langmuir trough study of this new fullerene derivative indicates that floating film could form monomolecular thick film at the air/water interface at lower concentration, and can be well transferred the floating mixed CB and arachidic acid film onto substrates using the Langmuir-Blodgett (LB) technique. In the case of the mixed film, high quality films with thickness of up to 50 layers could be readily built up. The absorption variation with film thickness at 255nm was measured, indicating good LB deposition up to 50 layers.
Preparation of Co4W6O21(OH)2·4H2O via Microwave Hydrothermal Method and its Reaction Process
Authors: He Xiu Juan , Cao Li Yun , Kong Xin Gang , Huang Jian Feng , Wu Jian Peng
Published: December 2014

A new kind cobalt tungstate in Co4W6O21(OH)2·4H2O was smoothly synthesized by microwave hydrothermal process lasting for 80min at 190°C, in which Co (NO3)2·6H2O and Na2WO4·2H2O of analytical grade were selected as raw materials as well as the pH values adjusted from 3 to 5.5. Furthermore, the phase structure and the morphology of target products were characterized by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). Additionally, the absorption spectrum of these samples was detected by UV-Vis spectrophotometer. The results showed that the cobalt tungstate in Co4W6O21 (OH)2·4H2O structure belonged to the cubic crystal system with the lattice constant of 12.858Å and its micro geometric configuration tended to be rhombic dodecahedron. On the condition of pH value at four is best for the propagation of crystals. Moreover, in the absorption spectrum it is indicated that the band gap width of this materials equaled to 3.18eV at pH=4 while 3.81eV at pH=5.
Luteolin Imprinted Polymer with Selective Recognition and Adsorption Performance
Authors: Meng Ping Rui , Li Liang Bo
Published: December 2014

In order to selectively separate luteolin from its crude solution, we synthesized luteolin molecular imprinted polymers (LMIP) with high recognition specificity for luteolin, using an imprinting technique. Luteolin was used as template, methanol as solvent, and N,N’-methylenebisacrylamide (MBAA) as the cross-linking. Then prepared LMIP were characterized and evaluated by scanning electron microscope (SEM) and equilibrium absorption experiments. The results showed that the cavities matching with the template molecules in size and structure were present in the LMIP. Adsorption dynamics analysis suggested that, when the adsorption time reached 4 h, the adsorption process had reached balance and the adsorption capacity was at steady state. The selective adsorption amount reached at 35.65 umol/g for the LMIP, while a lower value of 11.68 umol/g for the blank polymer (i.e. nontemplated). Relative to the corresponding blank polymer, LMIP had an excellent recognition to luteolin in methanol solution. Keywords: Molecular imprinting, Molecular recognition, Adsorbent, Luteolin
Thermoelectric Properties of Binary-Phased Nanocomposites
Authors: Lu Peng Xian
Published: December 2014

In order to increase the electrical conductivity greatly but maintain a large Seebeck coefficient and a low thermal conductivity simultaneously, the binary-phased LaCeFe3CoSb12-Sb nanocomposites composed of LaCeFe3CoSb12skutterudite nanospheres and semimetal Sb microsized ribbons were fabricated via a hydro/solvo thermal route. The results suggest that the Sb powders result in a disordered structure during a hot-press process at its melting-point temperature and the disordered structure has been partly preserved into the room-temperature materials successfully. The Sb microsized ribbons enhance the electrical conductivity of the binary-phased materials largely, meanwhile the disordered structure increases the Seebeck coefficient obviously even though the thermal conductivity is also increased slightly. Consequently, the figure of merit of the binary-phased materials is improved significantly and the maximum value of 1.54 at 773 K has been realized for the LaCeFe3CoSb15material.
Cholesteric Cyclohexane-Containing Side-Chain Liquid-Crystalline Polysiloxanes
Authors: Li Ying , Zhang Liang , Chang Meng Jie
Published: December 2014

Two new kinds of Cholesteric cyclohexane-Containing Side-Chain Liquid-Crystalline Polysiloxanes (PAand PB) were synthesized via hydrosilylation reaction of polymethyl hydrogen siloxane with cyclohexane mesogenic monomers (MAand MB). The yield of PA, PBwere 71.6%, 82.5% and 81.0%, respectively. The molecular structures of MAand MB, PAand PBwere investigated by Fourier transform infrared spectroscopy (FTIR) and hydrogen-nuclear magnetic resonance spectra (1H-NMR). The corresponding liquid crystalline phase type was also observed by polarizing optical microscopy (POM) and X-ray diffraction (XRD). The liquid crystalline phase behavior and thermal properties of the polymers were analyzed by differential scanning calorimetry (DSC). Results showed that MAand MBexhibited multicolor platelet texture of a blue phase and cholesteric phase, and the Tmand Tiof MAand MBincreased with the increasing flexible chain length. The mesophase temperature range of PAand PBwas broader than that of MAand MB. PAexhibited a rare nematic phase----spherulite texture of polymeric smectic A phase. PBwere of cholesteric and nematic---- cholesteric phase. The Tmand Tiof PAand PBincreased with the increasing flexible spacer groups.
Porous Poly(1-naphthylamine) Synthesized by Interfacial Polymerization
Authors: Hou Zhen Zhong , Yang Qing Hao
Published: December 2014

Porous poly (1-naphthylamine) were synthesized by interfacial polymerization method. The effects of several reaction conditions including oxidant/monomer molar ratio, polymerization temperature and reaction time on the polymerization yield have been investigated. The highest yield of poly (1-naphthylamine) was up to 73% at oxidant/monomer molar ratio of 3 and polymerization temperature of 25 °C for over 20h. Using FT-IR and XRD to analyze the structure of the obtained polymer, the results show that the main mode of connection for 1-naphthylamine units was linking N to para-C and it formed amorphous polymer with some ordered strutures. The micro-morphology of the polymer observed by SEM was found to have irregular porous structure with pore size less than 5μm, which may be related to the “self-emulsion effect” during polymerization.
Chemical Structure Changes and Correlation Analysis of High Density Polyethylene after Natural and Xenon Aging
Authors: Guo Jun Jun , Yan Hua , Hu Zhi De , Yang Jian Jian
Published: December 2014

Elucidation of the chemical structure changes that take place of high density polyethylene (HDPE) used as rotational packaging case by attenuated total reflection infrared spectroscopy (ATR-FTIR), when natural aging of Lasa Tibet and xenon aging. The variations of carbonyl index (CI), hydroxyl index (HI), branching degree (N) and crystallinity (Xc) have been studied from qualitative and quantitative. Finally, the correlations between natural and xenon aging have been closely followed. It found that the oxidation and growth of unsaturated compounds play a leading role in the natural aging progress, but the polymeric chain scission is weak effect. However, the samples show a slower growth of unsaturated compounds and a sharp increase in polymeric chain scission after xenon aging. The CI, HI and N increased generally in a line fashion after natural and xenon aging while the Xc changes little.
Ultrasonic Welding of Fe78Si9B13 Metallic Glass
Authors: Song Xiao Cun , Zhu Zheng Qiang , Chen Yan Fei
Published: December 2014

The solid bonds of multi-layer Fe78Si9B13metallic glass foils have successfully been produced by ultrasonic welding technology. The interface of weld joints was investigated by Optical micrograph (OM), scanning electron microscope (SEM) observation, micro-area X-ray diffraction (micro-XRD) and differential scanning calorimetry (DSC) analysis. The results demonstrate that no visible interface and defects were observed and the amorphous structure was maintained. The thermal properties of the joined metallic glasses were the same as that of the parent metallic glass. The formation of joining metallic glasses was attributed to the superplastic flow and the thermal stability at elevated temperatures in the supercooled liquid state. Ultrasonic welding as tack welding proposes an effective method for the preparation of bulk metallic glasses (BMGs) and lays the foundation for its future applications.
Microstructure Morphology and Mechanical Properties of Steel 30CrMnSiNi2A Irradiated by Continuous Wave Laser
Authors: Wu Tao Tao , Wang Li Jun , Wei Cheng Hua , Pan Chun Xu , Chen Lin Zhu , Ma Zhi Liang
Published: December 2014

Steel 30CrMnSiNi2A slices were irradiated by a continuous wave fiber laser beam with the intensity of 14.5W/cm2. Alloy samples with various temperature processes were obtained by changing the laser irradiation time, irradiation times and atmosphere environment. X-ray diffraction, scanning electron microscope, energy dispersive spectrometer and nanoindentation system were employed to characterize their microstructure morphology and mechanical properties. Three layers were observed in the samples fracture, namely oxide film, hard brittle layer and alloy substrate. The hard brittle layer had a higher hardness and a lower toughness compared with the base metal. Referring to the temperature history, we deemed that the surface oxidation and the solid phase transformation were the main factors which changed laser coupling efficiency. The results also illuminated the correlation between the microstructure morphology and the response to laser irradiation of the samples.
Studying on High Temperature Thermoplastic of High Carbon Steel
Authors: He Lang , Tang Yu
Published: December 2014

High temperature thermoplastic of 50Mn2V casting slab was tested by Gleeble-1500 thermal simulator machine. The morphology, microstructure and composition of fracture surfacewere observed and analyzed by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS).The results show that, there are two brittle temperature zones of 50Mn2V casting slab at the temperature of 600~950°C and 1300~1465°C, respectively, The section shrinkaging rate is less than 60%. The fracture mode changes from mixed one dominated by intergranular to toughness transgranular one with the increase of temperature at the range of 600~1250°C. However, the fracture is along with the solid-liquid phase at the range of 1300°C~ melting point.
The Preparation and Photo-Thermal Property of Ag2S Nanomaterials
Authors: Yuan Xiao Zhen , Xu Hai Qing , Shan Yan , Chen Ke Zheng
Published: December 2014

In this paper, Ag2S nanomaterials with good morphology and crystalline have been prepared successfully by a hydrothermal method with AgNO3 and (CH2)2CS as raw materials, SUDEI and PVP as surfactant, respectively. The photo-thermal transformation performance of the nanomaterials was studied. It was found that the Ag2S nanomaterials had a good photo-thermal property and the corresponding photo-thermal transformation efficiency could reach up to 63%.
Multiwalled Carbon Nanotubes Covered with Cobalt (II) Phthalocyanine by In Situ Synthesis and its Electrochemical Sensing Performance towards DA and UA
Authors: Wang Hua Hua , Li Nan , Li Kai , Bu Yuan , Dai Wen Le , Zuo Xia
Published: December 2014

Multiwalled carbon nanotubes (MWCNTs) as an excellent supporter covered with a thick layer of cobalt phthalocyanine (CoPc) were prepared by in-situ synthesis. Platinum particles were adopted to enhance the conductivity of CoPc-MWCNTs. The final nanocomposite Pt-CoPc-MWCNTs was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Strong aromatic π-π stacking between MWCNTs and CoPc made CoPc in-situ forming on MWCNTs. With homogeneous thickness of CoPc covered on the MWCNTs and Pt particles equally distributed, the nanocomposite was used as electrocatalyst. The electrochemical properties of the composite got researched by casting the dispersion of Pt-CoPc-MWCNTs on the glassy carbon electrode. Compared with other modified electrodes, Pt-CoPc-MWCNTs/GC electrode exhibited excellent electrochemical activity towards dopamine (DA) and uric acid (UA). Linear responses for DA and UA were obtained in the ranges of 5 to 170 μM and 5 to 100 μM, and limits of detection were 2.6 and 1.4 μM (S/N= 3), respectively. Simultaneous detection of DA and UA in the presence of ascorbic acid (AA) also displayed selective property, with no interference to each other.
Effects of Duration on Wear Rate of a PTFE Composite
Authors: Hu Han Jun , Zhou Hui , Zheng Yu Gang , Zhang Kai Feng , Wan Zhi Hua , Gou Shi Ning , Wu Jin Long
Published: December 2014

A type of PTFE/MoS2/glass fiber composite has been used as bearing cage material. To study the friction properties, the tests have been performed under various parameters on block-on-ring. The experimental results were as follows: Wear rate of the polymer composites was dramatically affected by test duration. With increase of test duration, the wear rate rapidly decreased. At the sliding velocity of 1.83m/s and load of 45N, the highest wear rate was 8.85×10-15m3/N·m in the test of duration 0.5h, while the lowest was 0.88×10-15m3/N·m in the test of duration 10h (the minimum and maximum times examined).
The Preparation and Properties of SiO2-Al2O3 Composite Fluoride Removal Agent
Authors: Li De Gui , Gan Fang Shu , Qin Ming , Liu Shu Hui , Ouyang Hui Xiang , He Bin
Published: December 2014

The fluoride removal agents of SiO2-Al2O3spherical particles were prepared using aluminum powder and sodium silicate as the main raw material by sol-gel method. The samples were characterized by XRD analysis method, and several influencing factors of fluoride removal performances had been studied, such as the content of SiO2, calcinations temperature, calcinations time, pH values, etc. The results showed that the adsorption capacity of SiO2-Al2O3increased with the content of SiO2increasing in the range of 0 to 12%. The best calcination temperature is 500 °C, and the best calcination time is 1 hour. The concentration of fluorine could reduce from 190 mg/L to 0.388 mg/L in the environment of pH 5.5 ~ 6, and the adsorption capacity could reach 9.48 mg/g, and the fluoride removal rate could reach 99%.
The Effect of Phosphatic Composite on Magnesium Phosphate Cement Performance
Authors: Qi Zhao Qing , Wang Hong Tao , Dang Jun Liang , Zhang Shi Hao , Ding Jian Hua
Published: December 2014

The capacity of 10%, 30%, and 50% ammonium dihydrogen phosphate were replaced with an equal amount of three phosphate (potassium dihydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate) respectively. Magnesium phosphate cement was made by phosphate of replaced, which strength, setting time, fluidity, hydration temperature, and the hydration products was researched. The results show that: MPC was made that replaced with the equal amount of three kind of phosphate, which has good mechanical properties. Setting time and fluidity change along with the replacment. Three kind of phosphate replace ammonium dihydrogen phosphate, which change the hydration process of MPC. When ammonium dihydrogen phosphate was replaced by an equal amount of disodium hydrogen phosphate, the temperature of hydration is only 69.4 °C. XRD showed that the diffraction peaks of composite’s magnesium phosphate cement increases.
Novel Efficient Synthesis of Glycol Monoethers over Highly Active Tungsten-Containing Mesoporous Molecular Sieve SBA-15
Authors: Yao Yuan Xiang , Tuo Su Xing , Liu Jin Yun , Tan Xin Liang , Peng Zhi Guang , Yu Jin Gang
Published: December 2014

A tungsten-containing mesoporous molecular sieve SBA-15 (W-SBA-15) was synthesized directly by the hydrolysis of tetraethylorthosilicate and ammonium tungstate with triblock copolymer EO20PO70EO20(P123) as template in acidic medium. The W-SBA-15 was characterized by XRD, N2adsorption/desorption, UV-Vis spectroscopy, Raman spectroscopy and ICP-AES spectrometry. The W-SBA-15 exhibited high catalytic activity for the hydroxylation of cyclohexene with hydrogen peroxide (H2O2) as oxidant. The complete conversion of cyclohexene into glycol monoethers with very high selectivity (92.6%) were obtained over the W-SBA-15 catalyst.
Heparin Modified Temperature-Sensitive Hydrogels and Biocompatibility Research
Authors: Yang Ning , Shi Lu , Guo Yi Bin , Zhang Hao , Chen Li
Published: December 2014

Chitosan/Heparin (CS/Hep) modified temperature sensitive hydrogels of γ-PGA were prepared by layer-by-layer self-assembly process. The chemical structure of the hydrogels and the surface elements were characterized by FT-IR spectrograph, XPS and TBO staining. The biocompatibility of the CS/Hep modified ploy (γ-PGA-co-NIPAAm) hydrogels were analyzed by the experiments of cell adhesion, cell proliferation and low-temperature induced cell detachment. A temperature-sensitive hydrogels carrier that could specific binding to growth factor was prepared in this research.
Mild and Low-Cost Synthetic Process for Monodispersive Platinum Nanoparitcles on Carbon Aerogel
Authors: Li Feng , Zhao Gao Yang , Yang Ying , Pattrick Gary , Moutloali Richard
Published: December 2014

A mild synthetic process using formic acid as the reduction agent was applied to prepare 40 wt% Pt/carbon aerogel (CA) electrocatalyst. The as-prepared sample was characterized by transmission electron microscopy (TEM) and electrochemical measurements. The results exhibit Pt nanoparticles with narrow particle size distribution are dispersed throughout carbon aerogel structure. Moreover, the Pt/CA catalyst has smaller Pt nanoparticle mean size than Johnson Matthey HiSpecTM 4000 (JM4000). The electrochemical measurement results indicate that the Pt/CA catalyst with Pt loading of 40 wt% possesses similar electrochemical surface area (ESA) value and oxygen reduction reaction (ORR) activity as JM4000.
Study on Antioxidant Properties of the Carbon Fibers Coated with Oxide-Alumina-Silica Film
Authors: Liu Jia Lin , Zhang Wang Xi , Han Jing Xian , Liang Bao Yan , Ma Guo Rong
Published: December 2014

An oxide-alumina-silicacoating which would to improve the oxidation resistance of carbon fibers was prepared by sol-gel method. XRD and SEM were used to characterize the surface appearance and phase transition about the carbon fibers with oxide-alumina-silica coating. The oxidation resistance of carbon fibers was also analyzed with the DSC-TG and the isothermal oxidation experiment. It was shown that the antioxidant properties of the carbon fibers with oxide-alumina-silica coating improved significantly. The concentration of precursor sol had an influence on the coating of carbon fibers and the antioxidant properties of the carbon fibers with oxide alumina silica coating increased 300°C compared to uncoated ones.
Studies on Mechanical and Optical Characteristics of TiN Films Deposited on Al, Ti Buffer Layers
Authors: Zhang Mei Jie , Wang Jing , Gu Guang Rui , Wu Bao Jia , Tian Hong Wei
Published: December 2014

The TiN ceramic films were deposited on Si (100) substrates with Al and Ti buffer layers by direct current reactive magnetron sputtering in the mixture gas atmosphere of argon and nitrogen. X-ray diffraction (XRD), Raman spectroscopy, scanning electronic microscope (SEM), nanohardness test and ultra violet-visible-near infrared (UV-VIS-NIR) spectrophotometer were employed to analyze the structure, mechanics and optical characteristics of the TiN films respectively. Analyses of XRD and Raman showed that all the TiN films deposited on Al and Ti buffer layers with TiN (111)-preferred orientations had polycrystalline structures, and the TiN film deposited on Ti buffer layer had a better crystallinity, smaller surface roughness, higher hardness and larger elastic modulus than those of the TiN film deposited on Al buffer layer. Moreover, the reflectivity of the Ti/TiN film became higher than Al/TiN film above λ=645 nm. At λ=1200 nm, the Ti/TiN film showed the maximum reflectivity of 81.8%. These conclusions also showed that the metal multilayer TiN films have important application and research prospect in terms of solar control coatings or resistance to high temperature in building coating material.
Microstructure and Properties of Thermal Sprayed ZrO2-NiCr Coatings
Authors: Liu Gu , Wang Liu Ying , Wang Wei , Wu Yong Fa
Published: December 2014

NiCr/ZrO2gradated coatings were obtained on C45 carbon steel by high velocity arc spraying and micro-plasma spraying to improve the mechanical and thermal behaviors of the carbon steel. Scanning electronic microscope (SEM) and X-ray diffraction (XRD) were employed to characterize the microstructure of the prepared composite coatings. Mechanical properties including hardness and bonding strength were also evaluated by microhardness tester and electron tensile tester. The thermal shock behaviors were investigated by quenching the coating samples in cold water from 900 °C and 1100 °C, respectively. The oxidation of NiCr/ZrO2gradated coating and C45 carbon steel substrate were carried out for up to 108 hours in air atmosphere at 1100°C. The oxidation behaviors were investigated after detailed examinations by thermal gravimetric analysis. Experimental results indicate that NiCr/ZrO2gradated coating exhibit a much higher hardness and high temperature oxidation behavior than the substrate. The bonding strength and thermal shock behavior of NiCr/ZrO2are superior to pure ZrO2coating, which could be mainly attributed to the NiCr intermediate graded layer due to the microstructure improvement and relaxation of residual stress concentration.
Thermodynamic Analysis of Chemical Vapor Deposition of the VN Coating
Authors: Xu Xian Feng , Li Hui
Published: December 2014

The VN coatings were coated by chemical vapor deposition on T12 substrate using V2O5, H2 and N2 as reactants. Thermodynamic calculation and analysis of formation reaction of VN were done by thermodynamic potential function. As shown by the experimental results, chemical vapor deposition of the VN coating with preheating temperature of 973K and deposition temperature of 1573K under normal atmospheric pressure was feasible.
Study on the (Fe,Cr)7C3 Particles Reinforced Iron-Based Composite Coating
Authors: Niu Li Bin , Xu Zhen , Peng Jian Hong
Published: December 2014

An iron based composite coating reinforced by (Fe,Cr)7C3particles, with a thickness of 4.0 mm, was fabricated on the ductile cast iron substrate by means of a centrifugal casting and in situ techniques. The microstructure and properties of the composite coatings were investigated by optical microscope, X-ray diffraction, scanning electron micrograph, energy dispersive spectrum, microhardness tester and pin-on-disc wear tester. Results show that the composite coatings consists of primary (Fe,Cr)7C3carbides as the reinforcing phase and interdendritic (Fe,Cr)7C3/γ eutectics accompanied by negligible graphite nodules as the matrix. The reinforcements are metallurgical bonded to the ductile cast iron substrate. Compared with unreinforced ductile cast iron, the composite coatings offer virtually a unique wear resistant behaviour under the condition of dry sliding with loads.
Preparation and Properties Characterization of N-Doped TiO2 Film
Authors: Zuo Jing Sheng , Wei Chang Ping , Peng Chun Jia , He Rui Ying , Wang Guo Dong
Published: December 2014

Nitrogen-doped nanoTiO2sol was prepared by sol-gel method. The obtained sol was coated onto glass substrates by spin coating method, followed by drying at low temperature and calcined at high temperature. The films were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and ultraviolet-visible spectra (UV-Vis) . The XRD spectra showed that the crystal type of N-doped TiO2films was anatase. The SEM images showed that the surface of films were flat without obvious crack and average diameter was about 20 nm. The UV-Vis spectra showed that the absorbance of N-doped TiO2films at ultraviolet region increased. N-doping caused photocatalysis response wavelength to turn longer. The photocatalytic activity of N-doped TiO2films was researched through the degradation experiment of methyl orange under ultraviolet light. Higher photocatalytic degradation efficiency was exhibited compared to the pure TiO2films.
Solution-Temperature-Controlled Growth of Microarc Oxidation Coatings on Aluminum Substrates
Authors: Zhang Ju Mei , Cai Hui , Sun Wan Chang , Cai Peng Hui
Published: December 2014

The growth of microarc oxidation (MAO) coatings on aluminum substrates was controlled via changing solution temperature from 10 to 60 °C. The results show that an elevation of the temperature lowers the applied voltage and the coating thickness. The coating formed in low-temperature solution demonstrates large-sized pores and contains lots of elements only originating from solute such as P, W, and V. On the contrary, numerous small-sized pores disperse homogeneously on the coating synthesized in high-temperature solution. It is assumed that the variation of solution temperature affects the dissolving capacity of the alkaline solution and the adsorptive capacity of solute anions, thus dominating the growth behaviors of MAO coating.
Research on HfSiN Diffusion Barrier Thin Film for Micro-Nanoscale ULSI-Cu Metallization
Authors: Liu Xue Mei , Chen Xiu Hua , Han Yong Qiang , Ma Wen Hui , He Jia Li , Xiao Yong Yin , Li Jiao
Published: December 2014

HfSiN/Cu/HfSiN/SiO2/Si multilayer films were prepared on Si substrate via magnetron sputtering technology. Annealing experiments of samples among 400°C and 700°C were carried out in order to investigate the anti-diffusion performance of HfSiN thin film to Cu. XRD, AFM and FPP were used to characterize the structure, morphology and the resistivity of the thin films before and after annealing, respectively. The failure temperature and failure mechanism of HfSiN thin film were analyzed. The anti-diffusion failure temperature of HfSiN thin film is 600 °C. And the main reason is that a large number of Cu large particles passed through HfSiN diffusion barrier layer and reacted with Si substrate and oxygen to generate Cu3Si and CuO with high resistance.
Preparation and Research of the Anticorrosive Coatings with Copper Ions-Polyaniline Loaded Montmorillonite
Authors: Qiu Lu Ying , Peng Long Gui , Duan Guo Qiang , Wang Ce
Published: December 2014

Montmorillonite intercalated polyaniline material was prepared by Situ polymerization method,the effects ofinitiator content, polymerization time, temperature and other parameters on the adsorption Cu2+of prepared material were discussed by single-actor method and the montmorillonite loaded copper ions-polyaniline was obtained. Finally an anti-corrosion coating was prepared with montmorillonite loaded copper ions-polyaniline as filler.The results showed that montmorillonite intercalated polyaniline had the best adsorption characteristics on Cu2+and its light transmission rate reached 100% when the montmorillonite was 2g, the initiator (ammonium persulfate) was 0.1g, the temperature was 80°C, and the polymerization time was 2h. The prepared anti-corrosion coating had good corrosion resistance and its hardness was 90, its adhesive force reached level 1 when mass fraction of filler was 10% in total.