bluuebunny/crossref_metadata_2025 huggingface dataset:
Dielectrophoresis Response and Manipulation of TiO2 Particles
Authors: Chen Hui Ying , Zhang Lu , Lan Bi Hao
Published: May 2013

This paper presents a device to investigate dielectrophoresis (DEP) effects through different patterns of the electrodes. Pattern of electrodes, DEP time and voltage have been described to research the manipulation of particles by dielectrophoresis. The TiO2sample droplet was dropped onto several electrode pairs using a micro-dropper. We succeeded in manipulating TiO2particles along the electric field and deposited them across the gaps between two electrodes by modulating different factors. SEM images were used to confirm the patterns of different electrodes.
Preparation and Property of Radiant Thermal Insulation Coating Based on Tourmaline and Hollow Glass Bead
Authors: Chen Cong , Wang Fei , Liang Jin Sheng , Chen Ya Lei , Tang Qing Guo
Published: May 2013

The radiant thermal insulation coating is prepared by tourmaline and hollow glass bead as main functional additives. The thermal insulation property is evaluated by thermal insulation effect and far infrared emissivity. The results show that the optimum contents of functional additives are as follows: hollow glass bead 4%, tourmaline particle 8%. The integral mean of far infrared emissivity and thermal insulation effect of radiant thermal insulation coating are improved by 3.812% and 6.66°C, respectively. The mechanism of thermal insulation is that the structure of hollow glass bead generates scattering and multiple reflections of solar radiation, and then tourmaline particle and the oxides of hollow glass bead radiate the absorbed heat from coating to atmosphere.
Effect of the Ce-Doped TiO2 on the Photocatalysis Degradation of MB
Authors: Fu Xiao Ye , Liang Xiu Hong
Published: May 2013

In this paper, we prepared a series of powders (pure TiO2 and Ce-doped TiO2) by sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), infrared spectrometer (IR) and UV spectrophotometer. The results indicated that the doped Ce influence the crystal structure of TiO2 and improve the temperature of crystal transformation. In the degradation of MB experiment, after 5 hours, the degradation efficiency of them (pure TiO2 , Ce-doped TiO2 and P25) under UV light is about 99.1%, while under visible light,Ce-doped TiO2 is about 60% higher than pure TiO2 and P25, up to 73%. This illustrates that the doped Ce increase the absorption to visible light and improve the photocatalytic efficiency.Key Words: TiO2, Ce-doped TiO2, photocatalyst, sol-gel method, crystal form
Observation on Non-Conductive Powder Samples by Scanning Electron Microscope
Authors: Ma Yuan Hui , Zhang Xing Hua , Chen Xue Guang
Published: May 2013

Different fixation methods have significant influence on observation of samples by scanning electron microscopy when non conductive samples are processed by plasma spudtter coating method. Non conductive powder samples using different treatments are observed on Philips XL30 scanning electron microscope and Hitachi S-4800 field emission scanning electron microscope. For the small size samples processed by two fixation methods, Sample shape were observed more clearly by the ultrasonic dispersion preparation on scanning electron microscope and had less interference of ion sputtering thermal effect. The effect is not obvious for the large size samples, and the effect of observation for non conducting samples is better on field emission scanning electron microscope at low accelerating voltage.
Submicron Tungsten Powder with Violet Tungsten Oxide via the Circulatory Oxidization-Reduction Method
Authors: Fu Xiao Ming
Published: May 2013

Submicron tungsten powder is obtained through oxidation twice and reduction three times. The samples are characterized by laser particle size analyzer and scanning electron microscope (SEM). Violet tungsten oxide (VTO) is prepared with ammonium paratungstate (APT) in the argon gas. Tungsten powder is obtained with VTO through deoxidation in the hydrogen gas (Rate of purity: 99.99%, dew point: -40°C), and tungsten powders are oxidized in the air. Tungsten oxide WO3) is reduced into tungsten powders in hydrogen gas again. The routes are repeated. The volume percent content of submicron tungsten powder between 0.1 μm and 1.0 μm is 95.73 %.
Submicron Tungsten Carbide Powder Prepared with Ammonium Tungsten Bronze
Authors: Fu Xiao Ming
Published: May 2013

Submicron tungsten carbide (WC) powder is obtained with ammonium tungsten bronze (ATB). The samples are characterized by laser particle size analyzer and scanning electron microscope (SEM). The analysis confirms that submicron tungsten powder is obtained with ATB through the deoxidation process in the hydrogen gas (Rate of purity: 99.99 %, dew point: -40 °C). And then submicron tungsten powder is carbonized in the hydrogen gas. The volume percent content of submicron WC powder between 0 μm and 1 μm is 83.7 %. Therefore, ATB is advantageous to prepare submicron WC powder via the conventional deoxidation and carbonization processes.
Progress on the Preparation and Application of Mg (OH)2 as New Flame Retardants
Authors: Wang Yuan Rui , Liu Feng Juan
Published: May 2013

The properties and the mechanism of flame retardants of magnesium hydroxide were discussed. The advantages and disadvantages of the methods are introduced to prepare magnesium hydroxide using the different raw materials. The modifying methods of magnesium hydroxide and application are summarized,and the development prospect of magnesium hydroxide is analyzed.
Hydrothermal Synthesis of Nano-γ-MnOOH Using Complexes
Authors: Ma Lin , Yang Li Zhen , Li Fu Yun
Published: May 2013

The paper gains a new method for the synthesis of γ-MnOOH crystals by adding ethylenediamine metal complexes under hydrothermal conditions. Study the effect of different preparation process to the reaction products .The structure and morphology of the resultant products were characterized by using XRD, SEM. The results show that the product is α-MnO2 when did not join the ethylenediamine metal complexes and the product is γ-MnOOH when joined the ethylenediamine metal complexes in 100°C under hydrothermal conditions. The purity of the γ-MnOOH is not the same when adding different ethylenediamine metal complexes. Inorganic salts will reduce the purity of the product and a new Mn3O4 crystal can be prepared by increasing the reaction temperature to 180°C.
On the Temperature Regions of the Phases of BaTiO3
Authors: Cai Yu Ping , Feng Meng Li
Published: May 2013

The Landau potential of BaTiO3 should be the invariant of the operations of the group Oh. By using the phase stability conditions, the temperature regions of possible phases are given. The pressure-temperature phase diagram of BaTiO3 has been investigated by using a modification of Landau potential. At low temperature, each phase boundary bends sharply down, and the non-linear behavior is associated with quantum effects. Saturation temperature characterizes the extent of quantum mechanical, and is related to the extent to which changes in the hard phonon modes influence the transition mechanism.
The Preparation of Nanosized Iron Oxide Using Hydrolysis Enhanced by CuO and their Characterization
Authors: Lin Li Hua , Li Jian , Chen Long Long
Published: May 2013

By adding CuO into heated Fe (NO3)3aqueous solution, a precipitation reaction takes place to form nanosized iron oxide. The product obtained were characterized by transmission electron microscopy (TEM), vibrating sample magnetized (VSM), X-ray diffraction (XRD), energy disperse X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The experimental results showed that the product is weakly magnetic nanoclusters based on smaller ferrihydrite Fe5O7(OH)·4H2O nanocrystallites. The nanoclusters are of about 40 nm size and absorbed by Fe (NO3)3. The experimental results are attributed to the Fe (NO3)3hydrolysis reaction being enhanced by CuO as hydrolyte. A new route is proposed for the preparation of nanosized oxide using hydrolysis enhanced.
The Research and Application Progress of Vanadium Dioxide Thin Films
Authors: Long Jian Ping , Jiang Mi , Li Xin
Published: May 2013

The VO2thin film is a kind of functional material with phase transition properties, and has broad application prospects. In this paper, the main VO2thin film preparation methods of sputtering, chemical vapor deposition, sol-gel method and the research status of electrical properties, optical properties , phase change properties and the calculation theory study were summarized. The main application fields and application progress of the VO2thin films in the smart windows, the infrared pulse laser protective films, the photonic crystal, the dielectric material of CD, the material of optical and electrical switch were introduced.
Study on Calcination Process of Serpentine Mixed with Ammonium Sulfate
Authors: Song Bei , Zhang Yu Ran , Di Yong Hao , Dai Rui , Zheng Shui Lin
Published: May 2013

The research involves the calcination of QingHaiQiLian serpentine with ammonium sulfate in order to extract magnesium, and evaluates calcination results through the mass of water leaching residue that comes from the calcination, dissolution and filtration process. Optimal calcination parameters of serpentine and ammonium sulfate determined by orthogonal experiments, single-factor experiments, elemental analysis and SEM analysis are: calcination duration of 1h, calcination temperature of 700°C, ammonium sulfate dosage of 90g (or mass ratio of ammonium sulfate to serpentine sample (m1/m2) of 3:2), under which condition a magnesium extraction rate of 62.75% can be achieved.
The Development of High Strength and High Bs NiZn Ferrite Material
Authors: Nie Min , Sun Jiang Ping , Xu Fang Zhou
Published: May 2013

NiZn ferrite material TN40S-X was fabricated by conventional oxide ceramic method. The test results show that the material possesses high mechanical strength and high saturation flux density (Bs),and it is suitable for low profile power inductors with dual requirements of mechanical strength and saturation flux density.
Study on Fire Resistance of Cement
Authors: Shan Lian Wei , Zhang Jun Li , Li Wei , Liu Zhao Jing , Wu Ze , Dong Li Min , Han Zhi Dong
Published: May 2013

This work aims to study the effect of sintering temperatures on the compressive strength and weight of net cement. The compressive strength and quality variety of cement which undergo different sintering temperatures (400°C, 600°C, 800°C, 900°C) and sintered at different times (1h, 2h) are studied through experiments and theoretical analysis. By using XRD explore the inner of sample chemical composition and further obtain the mechanism about sample of weight loss and strength loss. The main internal components of cement are Ca (OH)2, C-S-H, Ca2SiO3 and CaCO3 at room temperature. When the temperature was up to 400°C, The internal structure of cement started to be destroyed due to its hydration products C-S-H, Ca (OH)2 and CaCO3 began to decompose slowly.
Keywords: Cement, Fire resistance, Compressive strength
Preparation and Characterization of Diatomite Loaded Composite Phase Change Materials
Authors: Mao Jun , Zheng Shui Lin , Zhang Yu Zhong , Bai Yan Ping , Liu Yue
Published: May 2013

Organic phase change materials like paraffin as phase change material, modified diatomite as carrier, composite phase change material with proper phase change temperature and larger phase change enthalpy is prepared by melt blending. The structure and performance of composite phase material are characterized using SEM, FI-IR and synthesized thermal analyzer DSC. The results show that the phase change temperature of composite phase change material is 30, and phase change enthalpy is 89.54J/g. With every part preserved, phase change particles are distributed in the diatomite/melted paraffin matrix evenly. Stable composite phase change materials are prepared with diatomite as carrier and paraffin as PCM, which are bonded with Vander Waals forces in the form of physical adsorption.
The Study of Co-Doped NbC / Cr3C2 on the Application of Ultrafine WC-10%Co Cemented Carbides
Authors: Yu Hao , Jiang Xian Quan , Jiang Ai Min , Yu Rong , Wang Jin Wei
Published: May 2013

In this paper, ultrafine WC-10%Co cemented carbides were prepared by vacuum sintering. For inhibition of growth of WC grains during sintering, NbC and Cr3C2 were used as inhibitors. With the transformation of co-doped inhibitors content, the grain growth is inhibited and the grain size achieves 490 nm at 0.4% Cr3C2 / 0.3% NbC. The mechanism that co-doped NbC / Cr3C2 on the effective reduction of ultrafine WC-10%Co cemented carbides was analyzed. The 0.4% Cr3C2 / 0.3% NbC addition equipped with the best integrated mechanical properties was obtained in this study. And sintered samples were investigated with scanning and transmission electron microscopy (SEM).
Synchrotron-Radiation X-Ray Topography of the Rapid Grown KDP Crystals
Authors: Teng Bing , Zhong De Gao , Cao Li Feng , Wang Shu Hua , Jiang Xue Jun , Ma Jiang Tao , Zhang Shi Ming , Zhang Bing Tao , Huang Wan Xia
Published: May 2013

KDP crystals were rapidly grown from point seeds by temperature reduction method. White-beam synchrotron radiation X-ray topography was used to study the growth imperfections in KDP crystals. Strong dislocation bunches originate on the prismatic faces of the seed were found. The producing reason of these dislocation bunches was discussed. Sector boundary between the prismatic sector and pyramid sector caused by the unbalance distribution of trivalent metal ions were also observed and analyzed.
The Annealing Effect on Optical Properties of Silver Copper Alloy Films
Authors: Yang Guang , Zhou Ji
Published: May 2013

In this paper, the dielectric functions of Ag-30.3at.%Cu alloy films upon the annealing effect were investigated by variable angle spectroscopy ellipsometry (VASE). The silver copper alloy films were deposited onto p-type silicon (100) substrate by direct current (DC) magnetron sputtering. With the increase of annealing temperature from 100 °C to 300 °C, the image part of the permittivity for Ag-30.3at.%Cu is significantly decreased in the wavelength below ~500 nm. The structure and surface topography of the alloy films were characterized using high resolution scanning electron microscopy (HR-SEM) and X-ray diffraction (XRD). The effective medium theory (EMA) has been utilized for the treating of surface roughness. The dielectric functions can be manipulated by changing the annealing temperature. Key words: Dielectric functions; silver copper alloy films; magnetron sputtering
The Effects of Annealing Treatment Temperatures on Mechanical Performance of Aluminum-Coated Magnesium Composite plates
Authors: Wang Jin Wei , Jiang Xian Quan , Li Jie
Published: May 2013

Aluminum-coated magnesiumcomposite plates were fabricated by clad-rolling, then diffusion annealingtreated at 200°C, 250°C, 300°C, 350°C for 1h . The mechanicalperformance of aluminum-coated magnesium composite plates was investigated bythe test of tensile behavior. The best tensile strength and elongation wasfound at 250°C, 148.3Mpa and 6.48%.The changesof microstructure were investigated by metallographic microscope and scanningelectronic microscope. It was found that theinterface intermetallic compounds generated great influence to the interface bondingperformance because of its brittleness andthickness.
Investigation on AZO Films Deposited by Radio-Frequency Reactive Magnetron Sputtering
Authors: Kang Cheng Long , Deng Jin Xiang , Cui Min , Man Chao , Kong Le , Yang Ping
Published: May 2013

The Al2O3-doped ZnO(AZO) films were deposited on the glasses by means of RF magnetron sputtering technology. The films were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and Profile-system respectively. The effect of substrate temperature on the structure of the AZO films is investigated.As a result, the properties of the AZO thin films are remarkably influenced by the substrate temperature , especially in the range of 200°C to 500 °C. The film prepared at the substrate temperature of 400°C possesses the best crystalline.
Preparation and Properties of La-TZM Alloy Plates
Authors: Hu Ping , Wang Kuai She , He Huan Cheng , Kang Xuan Qi , Wang Hua , Wang Peng Zhou
Published: May 2013

The conventional TZM alloy plates have limited manufacture and application due to the lacking of enough mechanical property. To resolve this question, La doped TZM alloy plate was made by the powder metallurgy. With solid-solid rare La2O3 doping, sintering, hot rolling, warm rolling and cold rolling, the molybdenum alloy La-TZM plates were got. This kind of TZM alloy has better properties in both strength and elongation. The tensile strength of La-TZM alloy is 1038 MPa, and the elongation is 10.4%. Metallography test and scanning electron microscopy (SEM) are used to examine the microstructure of the La-TZM alloy plate specimen.
Alumina Nano-Wires and Nano-Belts Fabricated by an Effective Chemical Etching of PAA Template
Authors: He Ge Ping , Wang Kai Ge , Yin Hong Feng , Wei Jian , Yuan Hu Die
Published: May 2013

A tilted cathode was adopted to change the distribution of the electric field during the second anodization of the two-step method for fabricating nanoporous anodic alumina (NanoPAA). A variety of controllable patterns of NanoPAA templates were firstly prepared. After that, the functional nanostructures of alumina such as nanowires and nanobelts were accomplished by chemically etching the NanoPAA templates with phosphoric acid. In addition, the formation mechanisms of alumina nanopores and diverse low dimensional nanostructures influenced by the modified electric field were also discussed from the surface morphologies imaged by the field emission scanning electron microscopy technology. This chemical etching method was taken for an alternative approach for quickly fabricating low dimensional alumina nanostructures with high production and cost-effective.
The Research of Multi-Layer Metal Nets Joint Technology
Authors: Guo Liang , Zhang Guo Peng , Xu Pei Min , Zuo Cai Xia , Yang Ya Nan
Published: May 2013

The uniform and continuous nickel plating was electroplated on the metal net surface via a plating nickel process. Afterwards the gathered multi-layer metal nets were welded in vacuum fur-nace. This article considers that the bond strength of welded multi-layer metal nets when the tempe-rature was 900°C, 1000°C, 1100°C respectively and the plating thickness was 5μm, 20μm, 35μm respectively. The results indicate that as the temperature and plating thickness increases, the bond strength increases. When the temperature is 1100°C and the plating thickness is 35μm, the bond situation is the greatest.
Failure Analysis of Desulfurization Slurry Circulating Pump and HVOF Coating Protection Technology Progress
Authors: Zhao He Yong , Liu Shao Guang , Feng Yun Sang , Yao Ji Peng , Xu Yu Song
Published: May 2013

Failure form and erosion-corrosive mechanism of desulfurization slurry circulating pump were analyzed comprehensively, its protection status and HVOF spraying protection technology research were discussed, the technical characteristics and good prospects of HVOF applied in the slurry circulating pump were pointed out in this paper.Keywords: Desulfurization, Slurry circulating pump, Erosion, Corrosion, HVOF
Fabrication, Properties and Laser Performance of Indium-Substituted YAG:Ho Phosphor by Co-Precipitation Method
Authors: Liu Shi Xing , Zhang Wei , Hu Zheng Fa , Wu Hao Yi , Sheng Xia
Published: May 2013

Ho-doped Yttrium aluminum indium garnet, Y3Al4.5In0.5O12 (YAIG), was synthesized by co-precipitation method. Effects of Ho concentration, reaction mechanism, crystallinity and luminescence properties of the phosphor powders were studied using the X-ray diffraction, thermo-gravimetry Analyzer,scanning electron microscopy and photoluminescence. The performances of samples were analyzed by changing the concentration of Ho3+ and the substitution of indium for aluminum. The results showed that pure cubic garnet phase was formed in the Indium-substituted samples, and the critical distance of the energy transfer was 1.41 nm. Both the excitation and emission intensities increased firstly and then decreased with the increasing of Ho3+ concentration. When the concentration of Ho3+ reached 15%, the photoluminescence property of the sample was best.
Effect of Attapulgite Modification on Properties of Polypropylene Nanocomposites
Authors: Tang Qing Guo , Wang Fei , Tang Meng Ran , Zhang Fu Qiang
Published: May 2013

Polypropylene nanocomposites were prepared by means of melt mixing using attapulgite as inorganic components. The relation between surface free energy and mechanical properties of polypropylene nanocomposites and elasticized mechanism analysis of modified attapulgite nanofibers were mainly studied. The results showed that the modulus, fracture strength, fracture extensibility, tensile strength, yield strength, bend strength, flexural modulus and dynamic ductility properties of nanocomposites all enhanced obviously after modified attapulgite nanofibers were filled up. Surface free energy of attapulgite nanofibers and impact toughness properties of nanocomposites were in approximate inversely-proportion quadratic function relationship, which could provide a new way of thinking in the field of nanocomposites research.
Preparation and Characterization of Rare Earth Composite Catalytic Materials for Conversion of Exhaust from Natural Gas Automobiles
Authors: Yuan Yan Kun , Xue Gang , Wang Sai Fei , Zhang Xue Liang
Published: May 2013

A series of rare-earth composite catalytic material LZ1,LZ2 and LZ3 that contains mixture of La0.9Sr0.1Co0.5Mn0.5O3and Ce0.7Zr0.3O2in different proportion (3:7, 5:5, 7:3) were prepared by a sol-gel method and characterized by X-ray diffraction (XRD), specific surface analysis (BET) , Transmission electron microscopy (TEM) and temperature programmed reduction (TPR). The results indicated that in LZ3, a perfect crystal structure of perovskite and a cubic fluorite structure were formed. Besides LZ3 presented scattered spherical granules with a particle size of about 30 nm and a specific surface area of 20.9870 m2/g. The temperature of reduction peak was lowest (490°C) and peak area was larger, so it had the best catalytic activity for methane combustion.
Separation of Lignin from Pine-Nut Hull by the Method of HBS and Preparation of Lignin-PEG-PAPI
Authors: Jia Jun , Qu Yu Chao , Gao Yue , Yuan Yong Peng , Wang Kai Kai , Yang Fan , Wu Guang Feng , Li Ya Feng
Published: May 2013

By the method of high boiling solvent (HBS), HBS-lignin has been separated from pine-nut hull with 1,4-butanediol solution as solvent, and characterized by GPC, IR, 1HNMR and TG. The optimal conditions are described as: the ratio of solid raw material to solvent (g:mL) in 1:12, the amount of catalyst in 6%, the reaction time for 2 hrs, reaction temperature at 200°C, and 90% of 1,4-butanediol as the solvent, and the yield of lignin up to 70%. The hydroxyl value of obtained HBS-lignin is about 197.2mgKOH/g. Furthermore, the HBS-lignin replaces the partial PEG400 to employ the synthesis of lignin-PEG-PAPI. The experimental results indicate that mechanical properties and solvent resistance of lignin-PEG-PAPI are apparently improved with comparison to the PEG-PAPI.
Surface Modification and Coating of the Carbon/Carbon Composite in the Medical Fields
Authors: Xu Wen Feng , Liu Fei , Li Kui , Xiong Fu Hang , Huang Qiu Hong , Liao Xiao Ling
Published: May 2013

Carbon/Carbon composite is considered to be one of the best biomaterials substitute to human hard tissues due to its excellent biocompatibility and the much closed elastic modulus to human skeleton. It has been widely used and studied to the fields of artificial bones materials, but the osteoinductivity need to be improved. In recent years, the commonly used surface modification to improve their bone induction, such as hydroxyapatite, chitosan and so on, which prompted the adsorption of osseous protein, adhesion and growth of cells. It is believed the surface modification and coating of the carbon/carbon composite should promote its application in artificial bones. This article reviews the modified coat of medical carbon / carbon composites in recent years, and proposed some recommendations for the development of medical carbon / carbon composite in the future.
Preparation of ASZ Thermal Storage Ceramics for Solar Thermal Power Generation
Authors: Wu Jian Feng , Fang Bin Zheng , Xu Xiao Hong , Li Peng , Lao Xin Bin , Zheng Shu Qing
Published: May 2013

This paper aims to investigate the properties and microstructure of Al2O3-SiC-ZrO2(ASZ) composite ceramics for solar thermal power generation. The composite ceramics were prepared from α-Al2O3, partially stabilized zirconia (Y2O35.2 wt%) and silicon carbide fired at 1280 °C for 2 h through pressureless sintering. Influence of the contents of SiC and ZrO2on the performance of ASZ composite ceramics have been observed and extensively investigated via XRD, SEM, etc. The results revealed that the thermal shock resistance and high-temperature thermal properties would increase with the increase of the SiC content. No cracking occurred after 30 times thermal shock (from room temperature to 800°C with air cooling) while the bending strength after thermal shock test, the thermal expansion coefficient, the heat capacity, the thermal conductivity coefficient and the thermal conductivity were 76.99MPa (with a growth rate of 27.89% after thermal shock), 5.85×10-6°C-1, 1.05 kJ(kgK)-1, 0.01 cm2s-1, 2.26 W(mK)-1, respectively. The XRD patterns indicated that the main crystal phases included corundum, silicon carbide and zirconium silicate while the SEM images illustrated the well-grown crystal grains had the sizes distributed among 5-120 μm.Key words: Al2O3-SiC-ZrO2composite ceramics, Silicon carbide, Thermal properties,Microstructure, Solar thermal power generation
Advances in Synthesis and Properties of Poly(ε-caprolactone)/Carbon Nanocomposites
Authors: Liu Lian , Yu Teng , Wang Pei , Wang Guang Shuo , Wei Zhi Yong
Published: May 2013

Recently, Graphene oxide (GO), carbon nanotubes (CNTs) and fullerenes (C60) have attracted enormous interests because of their extraordinary properties, and they can improve various kinds of properties of polymeric materials. The latest achievements on investigating applications and properties including mechanical properties, thermal properties, crystallization behavior and bioactivity of poly (ε-caprolactone). (PCL)/GO, PCL/CNTs and PCL/ C60nanocomposites obtained in the last five years were summarized in this paper. The relationships between the properties of nanocomposites and the loading, dispersion chemical modification of GO, CNTs and C60were also discussed.
Preparation of Doped ZnOs via Microwave and the Study of its Performance
Authors: Pi Chun Lei , Ma Tao , Xie Ming Ming , Yang Li Zhen , Zhou Hui
Published: May 2013

This dissertation aims at the preparation of the Nanometer zinc oxide doping with different elements via the method of microwave. After characterizing those pellets of prepared Nanometer zinc oxide through XRD and SEM, it illustrates that the structure of Nanometer zinc oxide is still 6 wurtzite with high purity and the size of its pellet is at an averages of 21.83nm.But different mixed elements will differentiate the pellets' diameter. Moreover, through defined the Methyl orange as the stimulating pollutant, and conducted the Catalytic performance test of the samples. And the result shows that the effect was the best when doped with only Titanium, followed by doped with both Titanium and Magnesium, and the worst was doped with only Magnesium.
Keywords: Microwave heating, ZnO, Dope, Degradation rate
Green Synthesis of Poly(ethylene Glycol) Modified Multi-Walled Carbon Nanotubes and their Dispersibility
Authors: Yu Jin Gang , Jiang Xin Yu , Chen Xiao Qing , Jiao Fei Peng , Peng Zhi Guang , Zeng Dong Ming , Yao Teng Meng , Huang Du Shu
Published: May 2013

Poly (ethylene glycol) modified multi-walled carbon nanotubes were prepared by a green synthesis procedure, including oxidation, acyl chlorination and alcoholysis. All the liquid reagents were recycled by distillation or reduced pressure distillation, and complicated washing or purification was simplified. Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis were used to characterize the samples. The results indicated that PEG was grafted to the functionalized carbon nanotubes (f-CNTs) and the mass percentage of the grafted PEG was about 12%. After sonicatingf-CNTs in ethanol, the dispersibility off-CNTs in ethanol was about 0.46 mg/mL. The stability off-CNTs in ethanol was also tested by left standing a 0.4 mg/mLf-CNT/ethanol solution, no precipitation was found after 10 days.
A Novel Multifunctional Near-Infrared Absorbing Dye for Hg2+ Recognition
Authors: Hu Lei , Zhang Ya Fei , Wang Fang Kuo , Yan Zheng Quan
Published: May 2013

A novel near-infrared absorbing colorimetric sensor with multifunctional groups, bis-dibenzo-18-crown-6 squaraine (BCSQ), has been identified and applied for accurate Hg2+analysis based on the decrement of its UV absorbance (A) in the aqueous medium. The proposed method was successfully applied to analyse synthetic Hg2+samples and natural Hg2+samples. The results show that the linear range of Hg2+detection in aqueous medium is 7.5~150×108mol·L1with a correlation coefficient (R) of 0.9983 and a limit of detection (3σ, n=20) of 5.6 ×109mol·L1. The relative standard deviation (R.S.D.) for Hg2+detection was lower than 2.4% (n=5). The proposed method possesses the advantages of simplicity, rapidity, high selectivity and sensitivity.
Progress on the Numerical Calculation of Electrical Characteristics of Strained SiGe Channel P-MOSFET
Authors: Yu Jie , Wang Chong , Yang Yu
Published: May 2013

Recent progress in the computer simulation of strained SiGe channel p-MOSFET performance is reviewed. The electrical characteristics of strained SiGe channel p-MOSFET, such as threshold voltage, subthreshold characteristics, output characteristics, transconductance, quasistaticC-Vcharacteristics and transfer characteristics, and the effects of Ge mole fraction on electrical characteristics, are well discussed. Finally, the development of strained SiGe channel p-MOSFET is prospected.
Synthesis and Characterization of Alkyl Bacterial Cellulose through Etherification with Alkyl Bromide in DMAc/LiCl
Authors: Lin Ye Ting , Yu Chang Jiang , Zhu Li , Yin Xue Qiong , Lao Bang Sheng , Lin Qiang
Published: May 2013

Four types of alkyl (ethyl, propyl, isopropyl, n-butyl) bacterial cellulose with the degree of substitution 0.14-2.64 were prepared through etherification of bacterial cellulose with alkyl bromide in dimethyl acetamide/lithium chloride solution under ambient pressure at 50°C, with sodium hydride as the acid binding agent. The products were characterized through FTIR, NMR, and elemental analysis. The solubility of the derivatives in chloroform, ethanol, DMSO, and toluene/ethanol (V/V 3/7) was tested. Key words: alkyl bacterial cellulose, alkyl bromide, synthesis, characterization
W-Doped VO2 (M) with Tunable Phase Transition Temperature
Authors: Li Ming , Li Deng Bing , Pan Jing , Li Guang Hai
Published: May 2013

W-doped VO2 (B) nanoneedles were successfully synthesized by solgel combing with hydrothermal treatment, in which the polyethylene glycol (PEG) was used as both surfactant and reducing. The metastable VO2 (B) was completely transformed to thermochromic VO2 (M) after annealing at high purity N2 atmosphere. The DSC results exhibit a strong crystallographic transition, and the phase transition temperature of VO2 (M) can be reduced to about 38 °C by W-doping. Field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM) were used to characterize the morphology and crystalline structure of the samples. The variable-temperature infrared transmittance spectra of VO2 (M) demonstrate their potential applications in energy saving field.
The Synthesis and Solubility of a Wholly Aromatic Polyamide Containing Para- and Meta-Substituted Phenylene Rings
Authors: Wang Yi Fan , Sun Jun , Dai Li Xing
Published: May 2013

A series of wholly aromatic polyamides (aramid) containingpara- andmeta-substituted phenylene rings was copolymerized via phosphorylation method with different ratio of 4-aminobenzoic acid and 3-aminobenzoic acid. The inherent viscosities (ηinh) of products were 0.52-0.99 dL/g. The chain structure of the polymers was characterized by Fourier transform infrared spectroscopy (FT-IR) and Raman spectrum. The differential scanning calorimetry (DSC) was also performed to investigate the chain transformation behavior of aramid. With increasing the content ofmeta-substituted phenylene rings in macromolecular chain, the solubility of the polymers was improved obviously without appreciable loss for their original thermal property.
A Review on Research of the Sustained Release Drug Delivery System Based on Magnesium Aluminate Layered Double Hydroxide
Authors: Gou Guo Jing , Dong Li E , Bao Feng Juan , Wang Zhi Yu , Jiao Lin , Huang Jie , Sun Yue , Xue Bing
Published: May 2013

This paper reviewed our research progress in respects of th intercalation law of acetylsalicylic acid (ASP) with magnesium aluminate layered double hydroxide (LDH), the drug release mechanism and the tablet preparation effect of LDH-ASP system. We also discussed the propositions about the composite assembly rules, slow-release mechanism, and dosage form processing of the layered double hydroxide drug delivery system. Intercalation way and drug structure should be taken into consideration in assembly LDH-drugs system. The characteristic parameter of the composite LDH-drug reflected finely their loading efficiency and correlated definitely with drug release property. It had been found that the release rate and extent of intercalated drug was closely linked to the retarding status of LDH interlayer, which was dependent on the exchange mole ratio of n(drug) with n[HnPO4(3-n)-]. In addition, the grafting reaction and phase transformation degree of LDH layer was hinged on the acidity of solution. The slow-release function of the LDH-drug system could be improved significantly by compositing with dextran (DET). A sustained-release skeleton tablet was producted with DET-LDH-ASP drug delivery system and hydrophilic gel material HPMC, which could effectively overcome the "first pass effect" and " burst release problem" of LDH-drug oral agents. The slow-release effect of LDH drug delivery system could be ulteriorly improved in systemic circulation environments, attributed to the triple control of HPMC-DET-LDH, DET-LDH-drugs three-level supramolecular assembly and the special circulation in vivo.
Key words: Layered double hydroxide, Supramolecular assembly, Release control, Slow controlled release drug delivery system
CAD/CAM Zirconia for Dental Application
Authors: Li Ning , Wu Zhi Kai , Jian Chao , Zhao Wan Qian , Yan Jia Zhen
Published: May 2013

During the 20th century, both dental materials and dental technologies for the fabrication of dental prosthesis progressed remarkably. Owing to the increased demand of safety and aesthetics, 3 mol% yttria stabilized tetragonal zirconia polycrystalline has been recently introduced in prosthetic dentistry for the fabrication of crowns and fixed partial dentures, in combination with CAD/CAM technique. This greatly changed the conventional dental laboratory work which is labor-intensive and experience-dependent. This review mainly introduced the state of dental zirconia and the application of CAD/CAM technology in dentistry. Key words: Dental Zirconia; CAD/CAM Technique; Mechanical Properties; Transformation Toughing; Low Temperature Aging;
Research on Flexural Fatigue of Fiber Bundles for Lay-Flat Hose
Authors: Huang Zhong Yao , Cai Li Hai , Yang Jian Xiong
Published: May 2013

This paper studies the flexural fatigue performance for hose reinforcement layer fiber bundles including polyester fibers, para-aramid fiber and liquid crystal polyester fiber. Bending fatigue life and changes of three fiber bundles strength during the course of fatigue development were measured. Morphology of three fiber bundles was observed by scanning electron microscopy. From the analysis of the molecular structure of the three fibers, the Molecular chain flexibility is one of the main factors of impacting resistance to bending fatigue performance. Liquid crystal polyester fiber bundles have excellent mechanical properties and the high strength retention in bending fatigue test, which is an ideal material for the production of high-strength hose.
Synthesis and Cytotoxic Activity of Salicyloyl Hydrazone Derivatives
Authors: Qiu Xiao Yang , Shi An Ran , Zhang Xiao Li
Published: May 2013

Three salicyloyl hydrazone derivatives (compounds 1-3) were prepared by reacting salicyloyl hydrazine with substituted formaldehydes. Their structures were characterized by melting point, 1H-NMR, ESI-MS and elemental analyses. The cytotoxic activity of compounds 1-3 was evaluated in vitro against Hela cells (human cervical cancer cells). The results revealed that all the compounds showed cytotoxic activity, with IC50 values lower than 15 μM.
Study on Cytotoxicity of “Dextran-Magnetic Layered Double Hydroxide–Fluorouracil” Targeted Liposomes In Vitro
Authors: Huang Jie , Xue Bin , Gou Guo Jing
Published: May 2013

This paper studied the cytotoxicity of the dextran-magnetic layered double hydroxide-fluorouracil targeted liposomes ( DET-MLDH-FU liposomes, DMFL ) by MTT method against human ovarian adenocarcinoma cancer cells ( SKOV3 )in vitro. The results shown that the cellular inhibition rate at 24 h increased with the increasing of the fluorouracil concentration in DMFL, DET-MLDH-FU ( DMF ), fluorouracil-loaded liposomes ( FUL ) and free fluorouracil ( FU ). The order of inhibition rate was DMFL, DMF, FUL and FU at same concentration and intervention time. The IC50values of DMFL, DMF, FUL and FU were 14.39, 25.47, 34.39, 48.71 ( μgmL-1), respectively. The results of cytotoxicity experiment proved that the DMFL was superior than other preparations of fluorouracil.
A Review on Gene Delivery System of Layered Double Hydroxide
Authors: Dong Li E , Gou Guo Jing , Huang Jie , Sun Yue , Xue Bing
Published: May 2013

This paper aims to provide a concise review on the study of a gene delivery system with layered double hydroxides (LDH) as carrier. The issues, such as preparation and cytobiology effect of LDH-DNA hybrids, and the release mechanism of DNA from LDH-DNA complex, were discussed in detail. For achieving a ideal cell transfection efficiency, it would be prospective to improve both the intercalation effect of giant DNA, such as plasmid DNA and long chain DNA fragments, and the gene transfection technique of small DNA fragment.
Fabrication of Nano Hollow Graphene Oxide Spheres via Water-in-Oil Emulsion
Authors: Li Feng , Zhao Dong Lin , Bai Li Zhong , Zhang Dong Dong
Published: May 2013

nanohollow graphene oxide spheres have been successfully fabricated from graphene oxide nanosheets utilizing a water-in-oil emulsion technique. High quality graphene oxide nanosheets were prepared from natural flake graphite by oxidation and ultrasonic treatment. Graphene oxide nanosheets were supported by the water-in-oil interface, and self-assembled around water droplets under the assistance of ammonia. With the removal of aqueous ammonia, the graphene oxide nanosheets stacked and condensed at the water-in-oil interface and finally formed a shell structure around the soft template. The nanohollow graphene oxide spheres would be good candidates for catalyst supports, drug delivery and electrode materials in lithium-ion batteries.
Facile Synthesis of (R)-1-(1H-indol-3-yl)propan-2-amines Hydrochloride from Ketones
Authors: Peng Zhi Guang , Yao Yuan Xiang , Yin Dong Hong , Liu Jian Fu , Yu Jin Gang , Huang Du Shu
Published: May 2013

Two kinds of (R)-1-(1H-indol-3-yl) propan-2-amines were prepared through a five-step sequence procedure. The intermediate ketones were prepared by a modified Nef reaction using nitroalkenes to react with Fe-HCl. Condensation of (R)-(+)-2-methyl-2-propanesulfinamids with ketones, which was followed by a final desulfonation treatment with a solution of hydrochloride/methanol under mild conditions, optical pure (R)-sulfonamides could be synthesized. Without further chiral separation processing, the target products of (R)-1-(1H-indol-3-yl) propan-2-amines could be obtained with higher yield and excellent enantiopurity (over 99% e.e.), thus it was time-saving and cost-saving.
Preparation and Property of Lanthanum Ferrite Formaldehyde Gas Sensor Modified by Carbon Nanotubes and Silver
Authors: Zhang Yu Min , Lin Yu Tao , Zhang Jin , Zhu Zhong Qi , Liu Qiang , Liu Qing Ju
Published: May 2013

Our previous study revealed that the gas sensitive property of Silver-modified Lanthanum Ferrite (Ag-LaFeO3) is well, but the operating temperature is still high and the sensitivity also needs to be improved. This work based on our previous study. Ag-LaFeO3 was further modified by the Carbon nanoTubes (CNTs). The Ag-LaFeO3 powder modified with CNTs (CNTs-Ag-LaFeO3) was prepared by a sol-gel method combined with microwave chemical synthesis. The structure and gas-sensing properties were investigated. The results show that the structure of CNTs-Ag-LaFeO3 is of orthogonal perovskite. The sensitivity of 0.75% CNTs-Ag-LaFeO3 powder for 1 ppm formaldehyde is 13 at 86°C. The response and recovery time are 100s and 60s, respectively. Moreover, the sensor also has an obvious response for 1ppm formaldehyde at 58°C.
Development and Application of Porous Anodic Alumina Template
Authors: Zhang Xin Xin , Jin Ying Xia , Wang Hai Peng , Yang Yu
Published: May 2013

Various porous alumina structures are formed in different electrolyte systems. Adjusting the anodizing parameters can yield different apertures and regularities of the porous alumina template. Thus, porous alumina is widely applied in the preparation of ordered nanostructured materials. This study introduces the porous alumina structure, including its formation mechanism, manufacturing technology, and application in the manufacture of nanostructure materials.
Synthesis and Characterization of Low-Dimensional Rare-Earth Phosphate Nanomaterials
Authors: Yu Jie , Chen Hui Ying , Yang Jian Ping , Wan Xi Xi , Yu Shu Da , Li Hua
Published: May 2013

Several rare earth phosphate nanomaterials have been synthesized. It is shown that during the Micro emulsion preparation process, the size and morphology of rare earth phosphate nanomaterials could be tuned by changing the conditions of the micro emulsion system, which have a significant effect on the fluorescence properties.
Influence of Tourmaline Mineral Material on Structure and Physical and Chemical Properties of Water
Authors: Meng Jun Ping , Huo Xiao Li , Liu Jie , Pan Yan Fen
Published: May 2013

The influence of polar crystalline tourmaline on the structure and physical and chemical property of water in direct action and indirect action was researched by the solid/liquid independent device to isolate tourmaline and water. The results showed that far-infrared rays from tourmaline could react with water molecules, and the hydrogen bonds were weakened through resonance; The far-infrared spectra of water treated by tourmaline in the solid/liquid independent device was compared with that by direct contaction. The far-infrared of tourmaline played a more important role in changing hodrogen bonds than electric field and negative ions of water. Surface tension of water in the solid/liquid independent device was decreased after the treatment of tourmaline, and the decreased degree went up with the rise of temperature; the dissolved oxygen of water was increased by 7.8%, the conductivity 9.8% and the evaporation rate 10.4%.
Preparation and Performance of Antibacterial Composite Materials Containing Sepiolite Nanofibers and Germifuga
Authors: Wang Fei , Chen Ya Lei , Tang Qing Guo , Chen Cong , Liu Hai Feng , Liu Hui Min
Published: May 2013

Antibacterial composite materials were prepared by water as dispersing media, styrene acrylic emulsion as basic material, sepiolite nanofibers and germifuga as main functional additives. The antibacterial effect and mechanism were also systematically studied by means of antibacterial effect testing. The results show that the antibacterial effect was best when the proportion of germifuga and sepiolite nanofibers was 4% and 5%, respectively. The composite materials could restrict the bacteria growth effectively.
Effect of Sepiolite Nanofibers on Properties of EPDM Nanocomposites
Authors: Wang Fei , Tang Qing Guo , Chen Cong , Chen Ya Lei , Liu Hui Min , Liu Hai Feng
Published: May 2013

In order to use sepiolite nanofibers as rubber fillers, the hydrophilic character of sepiolite nanofibers should be modified by grafting organic group and controlling surface energy and proportion of dispersive interaction for improving compatibility of sepiolite nanofibers in rubber matrix. The surface energies of sepiolite nanofibers were measured by several liquids which were different on surface energy and polar interaction and calculated by Wus equation. The results showed that the mechanical properties can be improved after reinforcement by modified sepiolite nanofibers.
Effects of Sepiolite Mineral Nano-Fiber on Strength and Toughness of Ceramics
Authors: Wang Li Juan , Liang Jin Sheng , Di Xing Fu , Pei Xue Mei
Published: May 2013

The effects of sepiolite mineral nanofiber on strength and toughness of ceramics were investigated by bone china with addition of sepiolite mineral nanofiber. The flexural strength and fracture toughness were tested by three point bending method and single edge notched beam (SENB) method, and the microstructure of the ceramics was studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and optical microscopy. The results indicated that the structure pattern of sepiolite mineral nanofiber became much shorter and thicker after calcinations. Proper addition of sepiolite mineral nanofiber would increase the strength and toughness of bone china. The sepiolite mineral nanofiber can yield the bone china with fracture toughness and flexural strength values as high as 5.65 MPa·m1/2and 112.66 MPa to 5.87 MPa·m1/2and 118.90 MPa, mainly due to crack bridging, crack deflection and pullout by sepiolite mineral nanofiber.
Tuning Exchange Bias Effect in Ni50Mn36Sn14 Heusler Alloy
Authors: Li Zhe , Yang Cheng , Wang Ming Xin , Yin Jian , Wu Jun Jun , Xu Kun , Jing Chao
Published: May 2013

The tuning exchange bias HE at martensitic state of Ni50Mn36Sn14 alloy has been investigated by means of hysteresis loop measurement. It was found that the whole loop can be tuned by HFC from a double-shifted to a single-shifted hysteresis loop, leading to an appearance of maximum HEat HFC = 0.5 kOe. This behavior could be ascribed to the competition between two types of AFM clusters and HFC,which exhibits predominantly atlow HFC range, while the competition between FM clusters and HFC, which becomes predominant at high HFC range.
Preparation and Properties of Epoxy Resin Modified Waterborne Polyurethane
Authors: Zhan Biao , Li Qing Shan , Hong Wei , Xia Yu Ze , Wang Guo Wei , Xing Guang Zhong
Published: May 2013

The 4,4-diphenyl methane diisocyanate (MDI), polyethylene glycol (PEG) and epoxy resin (EP-44 and EP-51) were selected to prepare series of water polyurethane modified by epoxy resin (EWPU) by using chain extender, catalyst, and neutralizer. The influence of such factors as the R (NCO/OH), the contents of DMPA and epoxy resin on the performance of emulsion and film were discussed in details. The results shows that when R was 1.7, DMPA content was 7%, epoxy resin content was 8%, the EWPU emulsion appears brilliantly and shows great stability, it was measured that the water absorption, tensile strength and breaking elongation of the film are respectively 8.41%, 15.52MPa and 318%. Moreover, the comprehensive performance of the WPU modified by E-44 is better than that modified by E-51. According to the FTIR analysis, the EP has been successfully introduced to the waterborne polyurethane molecular chain.