bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Crystallinity of Carbon Fiber Reinforced Nylon 6 Interface by In-Situ Anionic Polymerization
Authors: Zhao Hong Kai , Xiao Li Guang , Gao Jing Wu
Published: March 2013

High polymer active functional groups can be grafted on the surface of carbon fibers so as to adjust the interface effect between fibers in the composite material and resin and improve the performance of composite material, by controlling the structure of grafted high polymer, the interface layer with intended performance can be well designed. The surface of carbon fiber has great influence on the nylon generated through in situ polymerization and modified nylon crystallization, and little transcrystallization on the surface will be formed when the fiber carbon without grafting; after grating of carbon fiber, large quantity of crystalline texture can be seen near the fiber, and the crystal with high density is helpful for the improvement of material performance.
Synthesis Star-Shaped Cationic Polyacrylamide- Dimethyl- Diallyl- Ammonium- Chloride by "Core-First" Method
Authors: Wang Jing , Chen Liang , Zhao Huai Yuan , Deng Jing
Published: March 2013

A star-shaped cationic polyacrylamide(star-P(AM-DMDAAC)) was synthesized by free radical copolymerization of monomer of acrylamide(AM) and dimethyl diallyl ammonium chloride (DMDAAC) using the redox system of pentaerythritol(PETL) and (NH4)2S2O8 as initiator. And the factor influence the polymer molecular weight were detailed studied. The results indicate that the effects of polymerization temperature, the dosage of initiator, molar ratio of AM to DMDAAC have a greater influence on the viscosity-average molecular weight of the copolymer. and adding urea and ethylenediamine tetraacetic acid(EDTA) for additive and adding ammonia for adjustment the acidity of catalyst system can also increase the polymer molecular weight. The sludge dewatering performance of self-made star-P(AM-DMDAAC) is better than the commercial linear type cationic polyacrylamide flocculants in the market. The structures of the resulting products were characterized by nuclear magnetic resonance(1H-NMR), the PETL as "core" of the star polymer, the AM and DMDAAC as "arms" of the star polymer. And the synthesis mechanism was proposed in this paper.
Synthesis,Characterization and Flocculability of a Poly (p-Ethylstyrene -Acrylamide- Propenohydroxamic Acid)
Authors: Chen Feng , Chen Zi Qiang , Wang Lei , Shao Xu , Zhao Hao Yu
Published: March 2013

A novel poly (p-ethylstyrene-acrylamide-propenohydroxamic acid) was synthesized. Copolymerization of acrylamide and p-ethylstyrene was carried out at 30°C in a microemulsion system, in which AM aqueous solution was the continue phase and p-ethylstyrene was the dispersed phase using ST-80 as surfactants respectively. Polymers of hydroxamic functions were prepared with hydroxylamine sulfate at temperatures from 60 °C-85°C and pH=10. The molecular weights were measured through the viscose method and the copolymers were characterized by FT-IR, UV and DSC. The effect of the polymer structure on the process of red mud setting was investigated. The results show that the optimal experimental condition is the hydroxamic acid flocculants contains 10.5% p-ethylphenylethylene and the molecular weight of synthesized product is 11×106; The polymer provides dramatically lower overflow solids at higher mud settling rates than hydroxamic acid flocculant.
The Residual Bending Properties after Impact of CFRP Laminates with Voids
Authors: Zhang A Ying , Zhang Dong Xing
Published: March 2013

The effects of voids on the residual bending strength after impact of CFRP laminates were discussed in this paper. Impact tests on the CFRP laminates with two porosity levels were conducted at five impact energy levels of 3J, 6J, 9J, 12J and 15J at the room temperature. The bending strength and the bending modulus of non-impacted specimens decreased 0.67% and 0.086% with the porosity increasing from 0.33% to 0.71%. Compared to non-impact specimens, the residual bending strength after impact (BAI) and bending modulus after impact significantly decrease with increasing impact energy. The void contents had the negative effects on the BAI after impact of the specimens at the same impact energy, while no obvious effects of void contents on the bending modulus are observed.
Determination of Rare-Earth Elements in Titanium Matrix Composites by ICP-AES
Authors: Pang Xiao Hui , Gao Song , Gao Shuai , Zhang Yan
Published: March 2013

A method of determination of Y , La ,Pr , Sm , Ce ,Gd and Nd rare-earth elements in Titanium matrix composite by inductively coupled plasma atomic emission spectrometry (ICP-AES ) was study. The experiment of sample dissolution，selection of analysis lines，the effect of matrix and coexist elements on the determination , instrument parameters of the analysis results were carried out. The recovery rate of this method was found in the ranges 98% to 105%, the RSD were less than 4%. The method is simple, rapid and accurate.
Electrochemical Performance of Iron and Cobalt Tetrapyrazinoporphyrazines Supported on Multiwalled Carbon Nanotubes
Authors: Liu Sen , Lu Jin Hua , Li He Jun , Fei Ying Bo
Published: March 2013

Iron tetrapyrazinoporphyrazine (FePTpz) and cobalt tetrapyrazinoporphyrazines (CoPTpz) supported on multiwalled carbon nanotubes (MWCNTs) are prepared by solid phase synthesis method. The products are characterized by scanning and transmission electron microscopy. The electrocatalytic activity of the obtained MWCNTs-supported FePTpz and CoPTpz assemblies (MPTpz/MWCNTs) is measured by cyclic voltammetry and rotating disk electrode techniques in an oxygen-saturated 0.1M KOH. The results show that MPTpz/MWCNTs are more efficient than reference MPTpz. FePTpz/MWCNTs are more efficient for O2 reduction than CoPTpz/MWCNTs, both of FePTpz/MWCNTs and CoPTpz/MWCNTs exhibit a one-step, four-electron pathway for ORR.
Effect of Temperature and Synthesis of ZnO Nanostructures on Zn Plate by Thermal Method
Authors: Thongteel Oamphon , Mekla Vatcharinkorn , Tipparach Udom
Published: March 2013

ZnO nanostructures were synthesized by thermal evaporation method using Zn metal plate in air. The Zn metal plates were frozen at -10 C, before into the furnace at a temperature ranging from 300 to 420 C for 15 minutes. The ZnO nanostructures were characterized by X-ray diffraction, XRD and field emission scanning electron microscopy( FE-SEM) and X-ray diffraction( XRD) pattern showed the crystal nanostructure of ZnO. FE-SEM images indicated that the nanowires were depended on temperatures. The diameter of ZnO nanowires werevaried from 50 nm to 70 nm and length of several 100 micrometers.
Effects of Activation Conditions on Preparation of Coal Tar Pitch Based Mesoporous Activated Carbon Using Template and KOH Activation Method
Authors: Fan Ming Xia , Chen Xiao Ling , Chen Jing Jing , Mao Lei
Published: March 2013

Mesopores are essential to improve transport of molecules within porous network and to facilitate adsorption of larger molecules. Mesoporous activated carbons (MACs) were prepared by template synthesis and KOH activation, using modified coal tar pitch and nanosized silica as carbon precursor and imprinting template respectively. The influences of different activation conditions, including KOH/C mass ratio, activation temperature and activation time on the pore structure of MACs have been studied. The SBET, total volume and mesopore volume of the result MAC were 1356 m2/g, 0.910mL/g and 0.704 mL/g respectively, when activation conditions with KOH/C mass ratio was 3.6:1, activation temperature was 850°C and activation time was 2.0h. It is possible to control their pore structure by selecting appropriate activation conditions depending on the final application of the MACs.
Fabrication of V-Doped TiO2 Nanoparticles and Photocatalytic Studies under Visible Light
Authors: Guo Jun Bo , Gan Zhang Hua , Liu Jing , Lu Zhi Hong
Published: March 2013

The V-doped TiO2 nanoparticles were successfully prepared by sol-gel method and characterized by X-ray diffraction (XRD), UV-vis spectroscopy and photoluminescence (PL) spectroscopy respectively. It is found that doping V can shift the absorption edge to the visible light region and decrease the recombination of photo-induced electron-hole pairs. Then the photo-absorption and photocatalytic activity were greatly improved. The optimal doping concentration is 0.5% due to synergetic effect of the recombination of electron-hole pairs and adsorption of dyes molecules at the surface of samples.
Effects of Surfactant Concentration on the Microstructures of TiO2 Hollow Spheres by Hydrothermal Method
Authors: Lu Lian Ying , Xu Lin , Yin Ting Ting , Wang Guo Hong
Published: March 2013

TiO2 hollow spheres were prepared by hydrothermal method using CTAB, glucose and (NH4)2TiF6 as surfactant, template and titanium source, respectively. The microstructures of hollow spheres TiO2 were characterized with X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared (FTIR). The results showed the concentration of the CTAB obviously influenced the morphology of hollow spheres TiO2. This synthesis route may also extend to the preparation of hollow structures of other metal oxides. Because of the large specific surface area, porous structure, and good penetration, the hierarchical TiO2-derived hollow spheres may find great applications in catalysis, photovoltaic cells and high surface area electrodes.
PH Dependence of the Size and Shape of the Gold Nanoparticles Prepared by Macromolecules
Authors: Wang Chun Rong , Yan Xian Zai , Yu Li Li
Published: March 2013

The eﬀect of the pH of the preparing solution on the size and shape of gold nanoparticles was studied in the solution containing soybean peptides or β-cyclodextrin (β-CD) as reducing agent. The resulting gold nanostructures were characterized by transmission electron microscopy (TEM), XRD and UV-vis spectra. Different shape of gold nanoparticles such as nanoplates, networked nanowires and spheres were prepared by changing the pH of solution. Electron diffraction pattern showed that the shape changes from plate or network to sphere as the pH of solution is increasing.
Preparation of Core-Shell Microspheres by Changing Reaction Solvent
Authors: Wang Zhen Huan , Xiao Xin Cai
Published: March 2013

We have successfully prepared monodispersed core-shell microspheres with polystyrene cores and poly(N-isopropylacrylamide) shells by changing solvent from nonpolar to polar for the first time. Effects of stirring time and reaction temperature on the particle size, monodispersity of the microspheres were investigated. With increasing stirring time at 800 rpm, the size of the spheres and the monodispersity are the best when stirring time is 60 min. And with increasing reaction temperature (above phase transition), the size of the microspheres decreases and the monodispersity becomes better.
Study on the Condition of Preparation of Magnet Activated Carbon by Pyrolytic Process
Authors: Huang Zhao Long , Feng Shao Ping , Xu Qing Fen , Li Xiu Lin , Xiao Rui Min , Sun Li Da , Liu Wei
Published: March 2013

A novel method for preparing magnetic activated carbon (MAC) has been investigated in this paper. The MAC was prepared by the follow routes: it was impregnated with a ferric chloride solution in pH=9 which adjusted by ammonia. The precursor of activated carbon loaded the iron hydroxide was prepared by the impregnation-basified method and sealed the sample with charcoal powder. The MAC was prepared by high temperature atmospheric pressure reduction roasting. The results showed that the MAC which was prepared by pyrolytic process of ammonia precipitation and at 600°C under atmospheric pressure for roasting 3-4 hours, the Fe(II)/Fe(III) molar ratio was 0.506 , the MAC accounts for 82.1% of total activated carbon and the ferric ion in MAC was 5.3% . The similar effect of pure activated carbon was observed in acid fuchsin solution test with MAC for decolorization. It subsidented quickly and separated completely under the guidance of magnetic field.
Structural and Photocatalytic Properties of CuO Nanorods Using the Hydrothermal Treatment Method
Authors: Noontasa Sopa , Mekla Vatcharinkorn , Kiennork Sert
Published: March 2013

In this work optical properties of CuO nanostructure were studied. CuO nanostructure were synthesized by the hydrothermal treatment method. The structural and chemical natures of the obtained materials were studied using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and study optical properties by UV-visible spectral. The XRD patterns of the CuO nanostructures indicated that CuO phases (JCPDS 05- 0661). The top-view SEM images, it can be seen clearly that high-density, horizontally scattered nanorod were grown on the product prepared at concentration of NaOH (aq) 7.5 M at 180 C for 12 h. The spectral of UV-vis data recorded showed the strong cut off at 341 nm.
Synthesis of the Mesoporous Silica with Different Morphological Structure by Modifying the Solution Conditions
Authors: Xu De Lan , Shao Chang Wang , Chen Feng Jiao , Zhou Guo Wei
Published: March 2013

Mesoporous silica with different morphological structure had been prepared using cationic surfactant cetyltrimethylammonium bromide (CTAB) and anionic surfactant sodium dodecyl sulfate (SDS) as co-surfactant templates and tetraethoxysilane (TEOS) as silica source. Variation on the morphological structure can be achieved by adjusting the solution conditions. The mesoporous silica with varied morphologies and pore structures were characterized by transmission electron microscopy (TEM), small-angle X-ray diffraction (SAXRD) and N2 adsorption-desorption isotherms. Based on experimental results, the mesoporous silica morphologies including vesicle-like and hollow nanospheres with mesoporous shell has been proposed. It was also observed a transformation from vesicle-like silica to hollow nanospheres with mesoporous shell by regulating the solution conditions.
The Application of Sodium Citrate in Co3O4 Nano-Particle Dispersing System
Authors: Li Wen Ze , Xiao Lin Jiu , Xie Ying , Qi Xuan , Sun Hong Bin
Published: March 2013

Based on the profound application, the Co3O4 was chosen to be research object; the optimized dispersing condition was studied and determined as: dosage of Co3O4 nano particle varied from 0.01 to 0.02mg/ml, sodium citrate was determined to be dispersing adjuvant with a dosage of 0.0005g/ml, ultrasonic time: 10min, and pH value was 7 to 8 when the Zeta potential was –57.1mv. After a detailed discussion of size distribution and dispersing condition, the size distribution of Co3O4 nano particle was measured with Malvern Nano Zetasizer to be 217nm.
The Effect of Alcoholic Reducing Agent and CTAB on Morphology and Structure of VO2 (M) Nano-Particles
Authors: Niu Chen , Qi Ji
Published: March 2013

M-phase vanadium dioxides (VO2) is synthesized by hydrothermal-solvothermal method. In this process,V2O5powder is used as raw materials,cetyltrimethylammonium bromide (CTAB) is used as templates and hydrazine combined with different alcohols such as ethanol, propanol and butanol are used as reductants. X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to test the properties of VO2nanoparticles. The results show that VO2(M) nano-particles were succsessfully synthesized under the conditions of thermal reduction temperature 250°C, reaction time 8h and drying temperature 60°C. The variety of alcoholic reducing agents plays an important role in the structure and morphology of the product VO2(M). That makes the size of the particles smaller, and with the carbon atom numbers increasing, the crystallinity is better.The different methods of adding CTAB affect the polycrystalline structure of the product, which is VO2(B) or VO2(M).
Synthesis of Novel Carbon Spheres and Study on Graphitization Process
Authors: Ma Ai Li , Li Cheng Qian , Du Wu Qing , Chang Jie
Published: March 2013

In this paper, carbon spheres were synthesized by CVD method. These carbon spheres exhibit diameters of about 200 nm. Thermal gravimetric analysis indicated the good stability in high temperature of the carbon spheres. The products were treated by microwave plasma and high temperature vacuum heat treatments respectively. The products were characterized by X-ray diffraction, Raman spectroscopy and Field Emission Scanning Electron Microscope. The study indicated that the original products, with perfect morphology and low graphitization degree, were converted to crystal. The different techniques were considered for the influence on the graphitization degree.
Effects of Sintering Temperature on Microstructure and Phase Formation of Nitrides Bonded MgAl2O4-Crefractory
Authors: Peng Nai , Deng Cheng Ji , Yuan Wen Jie , Zhu Hong Xi
Published: March 2013

The microstructure and phase analysis of in situ nitrides formation in MgAl2O4-C refractory were investigated with different temperature. The phase compositions and microstructure of the MgAl2O4-C refractory were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that sintering temperature has a significant influence on the microstructure and phase analysis of MgAl2O4 refractory. As the sintering temperatures are 1450°C and 1500°C, nitride that formed in samples is β-Sialon and the crystal morphology is columnar with short size. With the temperature rise to 1550°C and 1600°C, nitride formed in sample is AlON with the crystal morphology is tabular polymorph with large size.
Influence of Silicon Nitride on Properties of Corundum Based Castable
Authors: Wei Jun Cong , Yang Li Rong
Published: March 2013

The effects of Si3N4 addition on the room temperature physical properties and thermal shock resistance properties of corundum based refractory castables were investigated using brown corundum, white corundum and alumina micropowder as the starting materials and pure calcium aluminate as a binder. The phase composition, microstructure, mechanical properties of corundum based castables were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that as the increase in Si3N4 addition, the bulk density decreased and apparent porosity increased, the cold strength deduced. However, the residual strength rate increased. That is, the thermal shock resistance was improved. This is because even though the introduction of Si3N4 inhibited the sintering of material and deduced the compactness, microcracks were produced in the materials due to a difference in thermal expansion coefficient. So the thermal shock resistance of corundum based castable was improved.
Study on Effect of Sintering Pressure on the Properties of Diamond Bit
Authors: Yang Jun De , Huang Yang Yan , Chen Wei
Published: March 2013

High pressure is demanded in producting diamond bit by cold-pressing. Although the pressure could be reduced by hot-pressing, a certain pressure is demanded to ensure the compactness of diamond bit matrix. Four sintering parameters, sintering temperature, holding time, sintering pressure and the pressing mode, are mainly included during producting diamond bit by hot-pressing. This article mainly discusses the effect of sintering pressure on the properties of diamond bit. First, select a general formula of diamond bit, take sintering pressure as variable, other parameters remaining immovability; then load and sinter a set of samples in this parameter. Testing and analysing the samples by mechanical properties test, such as bending, tension, compression, and rigidity, and SEM fracture analysis, we obtain the optimum sintering pressure in this formula.
Anisotropy in Third-Order Nonlinear Optical Susceptibility of the Stretch-Oriented Chrysophenine-Doped Poly(vinyl alcohol) Films
Authors: Jin Zhao Hui , Gao Hua Jing
Published: March 2013

Stretch-oriented chrysophenine-doped poly(vinyl alcohol) (PVA) films were prepared at temperatures above the glass transition temperature of PVA. The optical absorption spectra of the stretch-oriented films exhibited a very high anisotropy (anisotropy ratio = 13). The third-order nonlinear optical properties of chrysophenine in stretch-oriented PVA films were measured by the resonant femtosecond degenerate four-wave mixing (DFWM) technique. The anisotropy ratio of the DFWM signal intensity was greater than 1000. The value of third-order nonlinear optical susceptibility of a uniaxially stretch-oriented chrysophenine-doped PVA film was 6.9×10-13 esu.
Calculation of the Interaction Forces between Superconductor and Permanent Magnet Using Equivalent Current Loops in Zero Field Cooling
Authors: Yang Yong , Zheng Xiao Jing , Li Tao , Hua Zhi Qiang
Published: March 2013

The levitation between high temperature superconductors (HTSs) and permanent magnets (PMs) has been applied to the flywheel energy storage systems and magnetic bearing systems for the last nearly twenty years. The interaction forces acting on the levitating body are calculated by the modified frozen-image method. The magnetic dipoles are equivalent to Amperian current loops. The current intensity in loops changes linearly when the PM moves. Under the zero field cooling condition, the expression of vertical force is obtained when the PM traverses vertically, and when the PM traverses horizontally, the expressions of vertical and horizontal forces are obtained. Those expressions of vertical and horizontal forces are gained by calculating the forces between current loops and using superposition theorem of vector. The calculations agree well with the previous experimental data, which means that the deductions of the expressions are reliable.
Charge Programming and Erasing Characteristics of the Submicron Stacked-Gate Flash Cells
Authors: Chen Shen Li , Chung Shun Tai
Published: March 2013

A non-Maxwellian hot-carrier generation current model for simulation of charge injection and erasing in the 0.35um flash EEPROM device is presented in this paper. Unlike the conventional model, which is based on the local electric fields in the device, and it accounts for non-local effects resulting from the large variations in electric field in a submicron flash EEPROM. Good agreements between the measured and calculated results in the charge writing and the Fower-Nordheim erasing operations.
Effect of Ca Doping on Crystal Structure of the Misfit-Layered Bi-Sr-Co-O Thermoelectric Materials
Authors: Tang Xue Lian , Zhao Kun Yu , Li Zhi Dong , Meng Zhao Biao
Published: March 2013

The series of Bi-Sr-Co-O thermoelectric materials Bi2Sr2Co2Oy (BC-2202), Bi2SrCaCo2Oy (BC-2112), Bi2Sr2CaCo2Oy (BC-2212) were prepared by conventional solid-reaction process. The crystal structure of Bi-Sr-Co-O compound were analyzed by XRD and TEM. The results show that the diffraction peak shift to the high angle, the interlayer spacing decrease with the Ca doping, however, the diffracion peaks of BC-2212 weak with the sintering temperature increased. The reason for that is some Ca can not enter the lattice while the Ca improved by whole mole.
Growth and Characterization of CdZnTe Bulk Crystals Grown by Temperature Gradient Solution Growth
Authors: Sun Xiao Xiang , Min Jia Hua , Liang Xiao Yan , Zhang Tao , Teng Jia Qi , Zhang Ji Jun , Wang Lin Jun
Published: March 2013

CdZnTe bulk crystals were grown by temperature gradient solution growth (TGSG) method with the lower starting growth temperature of 1223K, temperature gradient of 20-30 K/cm and a crucible dropping rate varied from 1 to 0.6 mm/h. Optical microscope, IR microscope, I-V characteristics and FTIR transmission spectroscopy were employed to analyze the growth interfaces, Te inclusions, resistivity and IR transmittance respectively. The results indicate that a smooth and uniform growth interface has been achieved. The density of Te inclusions is about 7.9-9.5×103cm-2, while the resistivity is higher than 6.87×109Ωcm and the IR transmittance is about 55-60%.
Manganese K- and L3-Edge X-Ray Absorption Fine Structure Study of Zn1-xMnxTe
Authors: Zheng Wei , Jang Ling Yun , Lee Jenn Min , Zheng Rui Sheng , Liu Chee Wee , Becla P , Feng Zhe Chuan
Published: March 2013

High-resolution synchrotron radiation x-ray absorption data on Mn K- and L3-edge for semimagnetic semiconductor Zn1-xMnxTe bulk materials are presented. A detailed analysis of the extended x-ray absorption fine structure by using the IFEFFIT program, and the chemical bonds of Mn-Te are obtained. The x-ray absorption near-edge structure of the Mn K- and L3-edges are investigated, and the electronic structure of Zn1-xMnxTe with various compositions are studied.
Photoluminescence Properties of Sulfur-Doped Sr3SiO5: Eu2+ Phosphor for White LEDs
Authors: Wang Zhi Qiang , Liao Jun Jie , Zhao Qian , Lin Hai , Jiang Shu Wen
Published: March 2013

A novel S-doped Sr3SiO5: Eu2+ phosphor was synthesized employing high temperature solid-state reaction method under reductive atmosphere environment. The crystal structure and photoluminescence properties of the phosphor, and the effect of S2- doping concentration on the photoluminescence intensity of Eu2+ was studied in details. The results show that the crystal structure of Sr3SiO5: Eu2+is not changed upon S2- doping. When the doping concentration of S2- is 1 wt%, the phosphor shows the maximum emission intensity, which is higher than that of Sr3SiO5: Eu2+ without S2-. Moreover, the addition of S2- results in an slightly shift of its emission spectra towards the red region, indicating that the S-doped Sr3SiO5: Eu2+ is an excellent yellow-orange phosphor for warm white LEDs.
The Influence of 4,4’-bis[6-(acryloyloxy)-hexyloxy]biphenyl Contents on the Electro-Optical Properties of Polymer Stabilized Liquid Crystals
Authors: Chang Hui , Fan Wen Juan , Liu Xiao Li , Huo Hong Ying
Published: March 2013

The polymer stabilized liquid crystals (PSLC) films was prepared subsequently based on the mesogenic diacrylate monomer 4,4’-bis[6-(acryloyloxy)-hexyloxy]biphenyl (BAB6). The effects of BAB6 on the morphology of polymer network as well as the electro-optical properties of the PSLC films were investigated. The helical structure of liquid crystals was observed in the morphology of polymer network by SEM. Further, a single switching process was observed at lower monomer concentration in this study compared with the former publication. When BAB6 concentration reached 7 %, the response time and contrast ratio of PSLC film were 7 ms and 16.8, respectively.
Study on Electronic Structure of the Ti Ion Implantation Al2O3 (0001) Surface by First Principles
Authors: Yu Jie , Chen Jing Chao , Ye Wei , Yang Miao
Published: March 2013

The First-principles based on plane-wave pseudo-potentials methods was applied to investigate the lattice parameter, electronic structure and optical property of Al2O3 (0001 ) by Ti Ion implantation . The calculation result show that the color center is form by transfer electron between 3d of Ti ion orbit energy level and Al ion 3p orbit energy level. and the absorption peak is located at the region of 2.1eV, which located in 400nm-450nm,where corresponding to the color and the color was caused by F color center
Comparative Investigation of Optical Properties in Tm3+/Er3+/Yb3+ Co-Doped Oxyfluoride Tellurite and Germanate Glasses
Authors: Hu Yue Bo , Qiu Jian Bei , Zhou Da Li , Zhou Da Cheng , Wang Rong Fei , Jiao Qing , Song Zhi Guo , Yang Zheng Wen
Published: March 2013

Tm3+/Er3+/Yb3+co-doped oxyfluoride tellurite and germanate glasses have been synthesized by conventional melting method. Intense up-conversion (UC) luminescence emissions were simultaneously observed under 980 nm excitation at room temperature in two glasses. The possible UC mechanisms are discussed and estimated. However, in the studied Tm3+/Er3+/Yb3+co-doped oxyfluoride glasses, tellurite glass showed weaker UC emissions than germanate glass, which is inconsistent with the prediction from the difference of maximum phonon energy between oxyfluoride tellurite and germanate glasses. Absorption spectrum and Raman spectroscopy were employed to investigate the origin of the difference in UC luminescence in two glasses. Our results confirm that, besides the maximum phonon energy, the phonon density of host glasses is another important factor in determining the UC efficiency.
A Design for the Large-Angle and Wide Wavelength Antireflective of Film
Authors: Yang Fu , Han Bing , Wang Jin Feng , Meng Xu Dong
Published: March 2013

The idea of non-uniform film was applied: the multilayer uniform films could be equivalent to a non-uniform film layer so that the non-uniform film system could be converted to the uniform film system and the index of refraction of each layer could be gotten by the equivalent method. The relevant design and reasonable optimization for the film system were conducted through computer so as to get a film system whose transmittance is greater than 95% with the incidence angle within 520-640 and wavelength at 420-670nm.
Study on the Synthesis CMCAB Electro Spinning Carbon-Coated LiFePO4 Anode Materials
Authors: Qiu Lei , Shao Zi Qiang , Yang Ming Shan , Wang Wen Jun , Wang Fei Jun , Li You Qi , Chen Jing
Published: March 2013

LiFePO4 was spinning with cellulose derivatives by electrostatic spinning for the first time. Processing conditions were adjusted to the solution concentration of 15%, an applied voltage of 25KV, the quality of mixed solvent with 4:1, and then about 0.1μm nano-fibrous non-woven fabrics can be obtained. FTIR showed that the CMCAB was synthesized successfully. Coulomb efficiency of electrode materials before and after the modification was maintained at about 100%, specific capacity of the battery in 2C of discharge rate, it was the first time that discharge specific capacity had increased from the unmodified 147.6 mAh.g-1 to the modified 160.6 mAh.g-1Superscript text. After 200 weeks' cycle, the capacity loss decreased from 11.38% to 5.11%.
Synthesis of LiMn0.7Fe0.3PO4/C Composite Cathode Materials for Lithium-Ion Batteries
Authors: Chi Na , Li Jian Gang , Wang Lei , Fu Jie Si
Published: March 2013

LiMn0.7Fe0.3PO4/C composite cathode material was prepared by using a solid state reaction method. The effects of annealing temperatures on the structural and electrochemical performance of LiMn0.7Fe0.3PO4/C were investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), charge–discharge tests and electrochemical impedance spectra (EIS). The results showed that all of samples have pure ordered olivine phase with orthorhombic Pnma structure. The electrochemical performance of LiMn0.7Fe0.3PO4/C can be improved remarkably with increasing temperature from 550oC to 650 oC due to increased crystallization, cation-order and decreased charge transfer resistance. However, increase temperature to 700 oC leads to bigger crystal particle size and decreased cation-order, thus higher resistance and deteriorated electrochemical properties. The sample prepared at optimized temperature of 650 oC presents a remarkable improved electrochemical performance. It delivers an initial capacity of 125.1 mAhg-1 at 0.2C, 95 mAhg-1 at 5C, and a capacity retention of 98.0% after 30 cycles.
Synthesis and Application of Novel β D-π-A Porphyrin Dyes in Dye-Sensitized Solar Cells
Authors: Zhou Fang Qun , Feng Ya Qing , Peng Xiao , Zhang Bao
Published: March 2013

Two β D-π-A porphyrin dyes have been synthesized and applied as photosensitizers for dye-sensitized solar cells. A maximum solar conversion efficiency of 2.2% has been achieved for dye 2-(N, N-diphenylaminophenylacetynyl)-12(13)-(4-carboxylphenylacetynyl)-5, 10, 15, 20-tetra (4-tert butylphenyl)porphyrin zinc.
Supercapacitive Properties of Hydrothermally Synthesized γ-MnOOH Nanowires
Authors: Zhu Da Zhang , Jiang Cheng , Sun Dong Mei
Published: March 2013

γ-MnOOH nanowires have been synthesized via a simple hydrothermal process without any template at relatively low temperature. The as-obtained sample was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties of the γ-MnOOH nanowires were investigated by cyclic voltammetry and galvanostatic charge-discharge methods. And a high specific capacitance calculated from the galvanostatic discharge curve was 191 F•g-1at the current density of 0.1 A•g-1, which remain a good specific capacitance of 143 F•g-1at the current density of 1.0 A•g-1. The electrochemical analysis results demonstrate that γ-MnOOH nanowires should be a good candidate as electrode material for supercapacitor.
Conductive Polymers Based on Phenothiazine-Benzothiadiazole: Synthesis, Characterization of Photovoltaics
Authors: Yun Dae Hee , Yoo Han Sol , Ko Tae Won , Park Yong Sung , Woo Je Wan
Published: March 2013

Two new π-conjugated polymers (Poly[(N-10’-(octan-3-yl)-phenothiazin-3,7-ylene)-alt- (4’,7’-bis(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PoPTZ-BT-BTD), Poly[(N-10`-(octan-3-yl) -phenothiazin-3,7-ylene)-alt-(4’,7’-bis(thiophen-2-yl)-5,6-bis(octyloxy)benzo[c][1,2,5]thiadiazole)] (PoPTZ-BT-BoBTD) ) were synthesized through the Suzuki coupling reaction for organic photovoltaics (OPVs), and their optical and electrochemical properties were analyzed. Their wavelength of maximun absorption was 526 nm and 506 nm in solution state, repectively, and 560 nm and 522 nm in film state, respectively. Their band-gap energy was 2.01 eV and 2.09 eV in solution state, and 1.82 eV and 1.91 eV in film state, respectively. The results of analysis of the chrateristics of photovoltaics, 0.79 % and 0.99 % of the maximum power conversion efficiencies (PCE), repectively.
Experiment for the Mix Proportion Design of Green and Self-Compacting C40 Concrete
Authors: Zhang Sheng Ju , Wang Xin Gang , Wang Su Rui
Published: March 2013

The self-compacting concrete is playing more and more important role in the construction industry with the advantages of greater mobility, better stability, and excellent character of filling the gap through capacity. There are different raw materials and construction conditions in each region, so, the research and development of the self-compacting concrete has a special significance according to the specific circumstances of each region. In this study, the parameters of the volume of coarse aggregate, mortar volume, the volume fraction of the sand, the mineral admixtures ash and cementatious coefficient were selected and calculated, and the C40 self-compacting green concrete was successfully configured.
Experimental Study on Compressive Performance of Polyurethane Composite Panel
Authors: Li Hong Qiao , Yue Tong Hui , Guo Zhi Hai
Published: March 2013

Through compressive test on 18 polyurethane composite panels in 4 groups, observing their failure characteristics under compression, getting test result on compressive performance and load-deformation curve, analyzing failure reason, which will set the foundation for further experimental study and theoretical analysis.
Status on the Sulfur Resources Reclamation from the Phosphogypsum
Authors: Li Hu Ping , Luo Kang Bi
Published: March 2013

The phosphogypsum is a byproduct of the phosphorus chemical industry, which has not high utilization ratio, is the main area of stockpiling and affects the environment and the sustainable development of phosphorus chemical enterprises. Based on the sulfur resources utilization status from the existing phosphogypsum in the article, the use patterns on the phosphogypsum are divided into three types of hot, wet and biological methods, and there are the reviews on the utilization status of the various methods.
Research Progress on Early Autogenous Shrinkage of Cement-Based Cementitious Materials
Authors: Huang Wei , Zhang Tao , Xu Yun Yun
Published: March 2013

Concrete autogenous shrinkage phenomenon would adversely affect the mechanical properties and durability of concrete, this phenomenon is important. Autogenous shrinkage problem of low water-cement ratio of the with high mineral admixtures, cement-based cementitious materials was introduced. The main reason for high-performance concrete early cracking being autogenous shrinkage was pointed out. Based on the home and abroad research status of low water cement ratio of the cement paste and concrete autogenous shrinkage, especially for early autogenous shrinkage phenomenon, the mechanism of autogenous shrinkage and the measure method is presented, and the improvement measures and the possible problems the need for further research work is presented.
Study on the Removal of Heavy Metals by Biomass
Authors: Zhou Neng , Zhou Zhen , Qin Yuan , Zeng Chu Jie
Published: March 2013

In this paper, the adsorption of heavy metals by biomass, namely dry garlic stem, an environmentally-friendly and natural adsorbent, were studied．The efficiency of the adsorbent was studied under different experimental conditions by varying parameters such as pH, initial concentration and contact time using batch adsorption technique. The results show that at pH 5.50, room temperature, the adsorption time 90 min and the amount of garlic stem 0.5 g, Co2+ have the maximum adsorption capacity. The maximum adsorption capacity of the Co2+ on garlic stem is 14.9 mg/g. At pH 9.50, the adsorption time 90 min and the amount of garlic stem 0.7g, Cd2+ have the maximum adsorption at the same temperature. The maximum adsorption of the Cd2+ is 20.90 mg/g. At pH 10.0, the adsorption time 150 min and the amount of garlic stem 0.3g, Ni2+ have the maximum adsorption at the same temperature. The dry garlic stem is a efficient adsorbent in removing cobalt, cadmium and nickel from aqueous solution.
Impact of Metallic Foam’s Microstructure to its Mechanical Property
Authors: Sun Zhu Feng , Xie Ling Yun
Published: March 2013

Explored the influence of pore structure of foam metal material on mechanical behavior of fracture. Discuss fracture toughness of several different micro geometric structure of foam metal material with finite element method. The author's calculations showed, microstructure and loading mode has an important effect on the fracture toughness of the foam metal material. due to ignoring the effects of cell structure on the mechanical properties of materials, the classic fracture toughness criterion -crack tip opening displacement (COD) is incomplete, it would be more efficient to take opening displacement change rate of the crack-tip as the parameter to characteristic the metallic foam material fracture toughness.
Experimental Investigations and Finite-Element Modeling of Thermoplastic Effect during Tensile Tests of Metal Material
Authors: Wang Wei Qing , Yang Li , Lv Shi Gui
Published: March 2013

During plastic deformation of materials, part of the plastic work is converted into heat, and the temperature field will be changed, this phenomenon is well known as thermoplastic effect. Based on the analysis of thermoplastic effect, the surface temperature of Q235 steel during quasi-static tensile tests was measured by using an infrared camera, and the surface temperature field and it versus time for different strain rate were obtained. A numerical procedure was devised to model the thermoplastic effect during the tensile tests by using ANSYS software. The results showed that, the heat loss during deformation process will be smaller as the strain rate increase, and the temperature increase on the specimen surface generated by the plastic deformation will be higher. The simulation results matched well with the experiment results showed that it was a good way to analyse the thermoplastic effect by the commercial finite element software.
Fabrication of Micro-Pins by Electrochemical Machining
Authors: Hourng Lih Wu , Li Bing Chi , Lai Chen I
Published: March 2013

The purpose of present paper is to fabricate tungsten rods with diameter of 200 μm to micro-pin electrodes, which have small conical angle and high aspect ratio, by the use of electrochemical machining process. The influence of working parameters, such as: applied voltage, electrolyte concentration, anode depth, and drawing speed on the machining process is investigated. Experimental results show that the applied voltage and electrolyte concentrate will affect the surface precision as the machining current is small than the limiting current. The anode immersed depth combined with a suitable drawing velocity has a significant effect on the conical angle (conicity) and aspect ratio.
Influence of Rolling Lubrication for Self-Excited Vibration on Tandem Cold Rolling Mill
Authors: Wei Li Qun , Qu Zhi Hao , Zhang Xing Yao , Guo Yan Hui , Wang Kang Jian
Published: March 2013

On account of the self-excited vibration in No. 5 stand of 1420 cold rolling mill, the relationship between rolling lubrications and self-excited vibration of rolling mill was theoretically studied. The self-excited vibration in No.5 stand of the mill was restrained by optimizing the lubrication technical parameters, and the critical stabilized rolling speed was increased from650 m/min to above 900m/min. The important problem disturbing the mill was accordingly resolved.
Study on Formability of TRIP Steel in Incremental Sheet Forming
Authors: Wang Jin , Li Li Hua , Wang Bao Ping , Jiang Hu Sen
Published: March 2013

The formability of a TRIP590 steel with 0.67mm thick in incremental sheet forming (ISF) was investigated. A variable angle cone, which opening diameter and generatrix radius are 100mm, and initial angle is 35 °, was formed until the specimen cracked. The depth at the intersection point of the actual wall thickness and theoretical wall thickness of the cone was measured, and the forming limit angle of the TRIP590 steel was got and about 66.5 °. Additionally, an arc groove and a cross arc groove were formed. Through measuring changes of the grids printed on the surface of the tested sheet, the forming limit diagram of the TRIP590 steel in ISF was obtained. The forming limit angle and diagram obtained can be used in designing the production process and numerical simulation of forming the TRIP steel.
Study the Adsorption of Mold/Bentonite Composite Adsorbent on Acid Purplish Red in Wastewater
Authors: Liu Gui Ping , Zhu Xing , Liu Yong Ci , Zhao Qi Rui
Published: March 2013

This study intends to explore the application of treating Acid Purplish Red dyeing wastewater with an inexpensive adsorbent compounded with Mold/Bentonite. It discussed the adsorption conditions and mechanism of Acid Purplish Red through single factor experiments (including dosage, initial concentration, and pH, stirring time and standing time). It also studied the adsorption kinetics and adsorption thermodynamics of this system. The results showed that the removing rate was above 94%, when the dosage of composite absorbent was 10 g/L, pH was nature (5.8), stirring time was 20min and standing time was 1h.The Acid Purplish Red system accorded with Langmuir and Freundlich absorption model, and it fitted Langmuir thermostatic adsorption equation better. And the saturated adsorption capacity can be obtained as 17.63mg/g. The sorption parameters showed that the adsorption of composite absorbent on Acid Purplish Red was easy, the system was monolayer adsorption. While the adsorption kinetic of Acid Purplish Red system fitted second-order kinetics with 78.15mg/g saturated adsorption capacity of Acid Purplish Red, and the adsorption was chemic-sorption.
Effects of Alkaline Nano-SiO2 Abrasive on Planarization of 300mm Copper Patterned Wafer
Authors: Tang Xin Liang , Liu Yu Ling , Zhang Hong Yuan , Bao Jie
Published: March 2013

Silica abrasive plays an important role in chemical mechanical planarization (CMP) of copper. In this paper, effect of different silica abrasive concentrations on copper removal rate and planarization performance of copper was investigated. The results show that the copper removal rate was increased as the concentration of silica abrasive increase. However, excessive abrasive will lead to a decreased copper removal rate. The initial step height values of the multilayer copper wafers were all about 2500Å, and after being polished for 30s, the remaining values of step height of slurry A, B, C and D were 717 Å, 906 Å, 1222 Å and 1493 Å. It indicates that alkaline copper slurries with different abrasive concentrations all had a good planarization performance on copper patterned wafer CMP. As the abrasive concentration increased, the planarization capability was enhanced.
Preparation of Biomedical Coating on Porous Titanium Alloy
Authors: Shao Hui Ping , Wei Ran , Lin Tao
Published: March 2013

The porous titanium alloys containing molybdenum elements have been prepared by gel-casting methods. The composite coatings with hydroxyapatite (HAP) and TiO2 were prepared on the precursor in this study. The microstructure was examined by scanning electron microscopy (SEM) and X-ray diffraction, and part of the coatings was examined by EDS to indicate the linear distribution of HAP and TiO2. The Solid content of gel-casting of water base can reacSubscript texth 35%，and porosity can reduce to 42% after sintering.
Study on Environment Friendly Insulated Coating for Non-Oriented Electrical Steel Sheet
Authors: Dong Xue Qiang , Guo Tai Xiong , Xu Quan , Yin Xi , Ran Chang Rong
Published: March 2013

At presant, most of the insulated coatings for non-oriented electrical steels contain chromium, and which need to be cured at a higher temperature. On the basis of analyzing the characteristic of the film-forming substance, a environment friendly insulated coating that have lower curing temperature for non-oriented electrical steel sheet is developed and coating process is studied as well, then measured the adhesion, insulation resistance, heat resistance, corrosion resistance and other properties of the coating. The results showed that, the coating can be fast-curing from 150°C to 250 °C, film of the coating is smooth, compact and uniform, and has excellent performance. So the new coating can meet the application requirement of the small and medium-sized motor.
Systematic Theoretical Investigation for Adsorption Behavior of CO on β-SiC (001) Surface
Authors: Cheng Ping
Published: March 2013

Based on the first-principles pseudopotentials and the plane wave energy band method, the adsorption behaviors of CO molecules on β-SiC (001) surfaces have been investigated in this paper. The calculations for stable adsorption site demonstrate that CO molecule is adsorbed at the lattice site of β-SiC. The absorbing energy of CO on SiC (001) surface is 2.984eV while the exclusion energy between CO reaches 2.965eV. The densities of State of CO became wider and it extends to lower energy when they adsorbent atβ-SiC (001) surfaces.
Supercritical Water Oxidation Kinetics of Textiles Dyeing Wastewater
Authors: Wang Qi , Lv Yong Kang , Zhang Rong , Bi Ji Cheng
Published: March 2013

Oxidation of the textiles dyeing wastewater was studied in a continuous-flow reactor that was operated between 400 and 650°C at a fixed pressure of 25 MPa. The total organic carbon (TOC) concentration of the raw wastewater was in the 112.52 mmol/L . Hydrogen peroxide (H2O2) was used as an oxygen source. According to the wastewater and oxidant concentrations, the global rate expression was regressed from the complete set of data under various conditions of the reaction. The reaction rate expression for the oxidation of the textiles dyeing wastewater was determined with the activation energy of 39.908 (±1.99) kJ/mol and the pre-exponential factor of 114 (±7.5) /s; and the reaction orders for the TOC and the oxidant were 0.896±0.01 and 0.061±0.01 at a 95% confidence level.
Surface Hydrophobic Modification of T-ZnOw with Silane Coupling Agent
Authors: Wu Zhong Yuan , Hu Liang , Chen Jia Xi
Published: March 2013

Surface hydrophobic modification of T-ZnOw was experimented with silane coupling agent KH-570(gamma-(methylpropyl acyloxy)trimethoxysilane). It was shown by FT-IR that the whiskers was modified by silane coupling agents molecular compounded with the Zn-OH of whiskers. The effect of grafted modification with KH570 on hydrophobicity of T-ZnOw was characterized with dispersion stability test in an organic solvent and measuring the contact angle between the whiskers on distilled water. The results showed that surface treatment of T-ZnOw with KH570 improves hydrophobicity of whiskers simultaneously, and the modified whiskers have much slower settling rates than the pristine whiskers in the liquid paraffin. The contact angle between the modified whiskers with distilled water is 137.75 degrees, which is a significant increase.