Chemical Engineering and Material Properties III

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Authors: Ye Jun Zhao, Zu Ting Pan
Abstract: The nanoscale TiO2 was synthesized and their electrochemical properties as the anode electrode materials for rechargeable Li-ion batteries were measured. The structure, morphology and electrochemical properties of the nanoscale TiO2 composites synthesized were characterized in detail by X-ray (XRD), Transmission Electron Microscopy (TEM) and electrochemical measurement. The first discharge capacities were 126 mAh/g for the nanoscale TiO2 at the current density of 100 mA/g at ambient temperatures. The specific capacities were stabilized at around 57mAh/g after 20 cycles.
438
Authors: Ying Jia, Ya Nan He, Feng Hao Liang, Mei Yuan, Tian Tian Liu
Abstract: Different morphologies of nanoZnO have been synthesized by hydrothermal method and ethanol-assisted hydrothermal method, the quantum yield has been improved by noble metal doping, and also the range of spectral absorption has been widened. Then the products are used in the photocatalytic process of UDMH waste water. It is found that the crystallite size of the products is about 41~46nm, the maximum degradation rates of ZnO/Ag are 92.7% under the ultraviolet light, and 80.2% under the sunlight. The variation of the photocatalytic middle-product under different light sources is analyzed and it is found that the middle-product is decomposed more quickly and throughly under sunlight.
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Authors: Hong Li Sun, Hong Mei Wang, Shi Zhong Luo
Abstract: Several kinds of modified carbon molecular sieves (CMSs) were applied for air dynamic separation by pressure swing adsorption (PSA) at ambient temperature. The textural properties were characterized by N2 adsorption/desorption isotherms at 77 K. Linear driving force (LDF) model was used to fit the experimental data for the mixed gas. Results had shown that the modified CMSs with Cu2+ had the highest separation factor for air separation comparing to other samples.
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Authors: Wei Xia Li, Yan Ning Yang, Qiao Ping Liu, Xing Xiang Ruan, Fu Chun Zhang, Shuo Jiang
Abstract: Cathode samples of titanium-based nanodiamond field emission were prepared by electrophoresis dispersed solutions in different formulas. Observe the surface and structure of the coating by using metaloscope, microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD); Test the field emission characteristic after annealing; Analyze the relation between the samples’ light photos and the uniformity of coating; Discuss the mechanism of the improved field emission characteristic after annealing. Under the same conditions the surface uniformity of diamond coating prepared by isobutyl alcohol is best,it is the minimum threshold electric field emission, 5.5 V/μm, the current density can reach to 85μA/cm2 at the field of 15V/μm. Field emission characteristic and luminescence could be best after annealing.
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Authors: Y.L. Li
Abstract: In this paper, the author had adopted the low-density ultrasonic field coupling method, coupled the ultrasonic directional beam to metallic melt, and then coupled energy to C/Al interface by sound propagation, eventually accomplish C/Al interfacial wettability and interfacial reaction by using ultrasonic field coupling method, and synthesize Al-Ti-C master alloys by using the same method. Some experiments showed that in the low-density ultrasonic field and under flux auxiliary wetting, there is no explicit incubation period in the prophase of wetting, in the medium term of wetting, the wetting angle between aluminum melt and carbon will reduce with time extension, however, the wetting spreading radius will increase with the extended holding time, and reach wetting balance state in 20 minutes. In the condition of 1023K, the equilibrium wetting angle is less than 22°,and wetting spreading radius is close to 20mm.
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Authors: Yu Wen Yu, Ke Wen Shu, Ling Zhong, Cheng Cai Zeng, Dong Zhang
Abstract: Nylon 6/66 copolymer with 0-10wt% content of hexamethylene adipamide salt (AH-salt) was prepared by melt polycondensation. It was found that the comprehensive performance of the copolymer was the best with 8wt% content of AH-salt through the test of tensile properties and bibulous rate. Compared with the performance of nylon 6 under the same condition, the elongation at break was increased by 131.04% (the stretching rate was 30mm•min-1) to 274.41%, the tensile strength increased by 19.38% to 64.68MPa, and the bibulous rate was decreased by 8.58% to 2.14%.
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Authors: Li Yue, Xue Fei Zhao, Shi Quan Lai, Li Juan Gao, Jie Yang, Ming Xi Han
Abstract: Coal tar soft pitch (CTSP) used as raw material of preparing needle coke was heat-treated at 460, 480 and 500 °C for different holding time under the pressure of 0 MPa and 0.25 MPa. The changes of group compositions such as toluene solubles (TS), toluene insolubles-quinoline solubles (TI-QS) and quinoline insolubles (QI) were mainly studies during the thermal conversion of the CTSP. The microstructure morphologies of some calcined cokes were characterized by scanning electron microscope (SEM). The results showed that the thermal conversion of the CTSP had the features of consecutive reaction, and the pressure could accelerate the conversion rate of TS and TI-QS and the formation rate of QI. The calcined coke derived from the semi-coke obtained at atmospheric pressure exhibited better and longer streamlined fiber structures than that of the semi-coke obtained at elevated pressure, while the latter possessed more compact carbon structures than the former.
467
Authors: Jia Wang, Yu Min Xia, Yan Ping Wang, Yi Min Wang
Abstract: Calcium carbonate (CaCO3) was mineralized in N,N-dimethylformamide (DMF)-H2O mixed solvents in the presence of polystyrene-b-poly (vinyl pyrrolidone) (PS-b-PNVP) block copolymer. The morphologies of PS-b-PNVP micelles and CaCO3 crystals were characterized by TEM and SEM. By varying the volume ratio of DMF-H2O, the CaCO3 crystals with different morphologies and phases were obtained. It was convinced that the morphology of crew cut micelles played a key role in the morphological formation of CaCO3.
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Authors: Du Shu Huang, Jin Hong Yin, Xian Shu Lv, Yan Xu, Jie Wu
Abstract: The extraction process of cobalt using microemulsion system saponified with P507 as extracting agent was studied. The influences of initial concentration, the concentration of P507, initial pH, the extracting time and the volume ratio of organic phase to water phase on extraction coefficient were also studied. Experimental results show that the saponification microemulsion system using P507 as extractant is thermodynamic stable, and it can separate cobalt better. The optimum conditions were achieved as: the initial concentration is 0.04 mol/L, pH is 2; The concentration of P507 is 6%, extraction time is 6 min; The volume ratio of organic phase to water phase is 1.5:1.
476
Authors: Men Wu, Dong Sheng Wang
Abstract: Silk sericin is used as a biotemplate to redox silver nanoparticles in situ at room temperature. Silk sericin provides multiple functions in the whole reaction system, serving as the reducing agent of Ag+, and the dispersing and stabilizing agent of the resulted silver nanoparticles. The effect of the concentration of sericin on size and shape of the reduced silver nanoparticles is studied. UV-vis spectra and TEM are used to detected the characteristic plasmon and the appearance of the obtained silver nanoparticles.
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