Advanced Materials Research Vols. 602-604

Abstract: In this work, on the basis of carbon materials microstructure and morphology, we study on the influence of carbon fiber content , graphite degree and metal impurities on oxidation performance of carbon materials. The result of oxidation test shows that there are more crystal defects at the interface of carbon fiber and carbon matrix, and oxidation activity of carbon atoms near the area of crystal defects is higher than others.Carbon materials with higher fiber content and higher graphite degree, has a better anti-oxidation performance. The presence of impurities, especially metal impurities play a catalysis role in oxidation of carbon materials. After purification, impurities escape from the graphite microcrystal,resulting that the distortion of lattice decreased, that cause the better anti-oxidation performance.

Abstract: In this paper, application of DWC with side rectifier (DWC-SR) to nitrobenzene distillation was studied. Simulation using Aspen plus software was done to compare the traditional two tower process with new process based on DWC-SR. The results show that, the two processes has almost no difference on the energy cost, which is also decided by the characteristic of DWC-SR, but large saving of capital investment and space can be obtained. In addition, only a reboiler is need in DWC-SR process, residence time of nitrobenzene, dinitrobenzene, etc inside high temperature region can be reduced, so can to avoid the frequently occurring explosion accident to a great extent.

Abstract: This article took the sodium sulfate and calcium chloride as the raw material and prepared calcium sulfate whiskers by hydrothermal method. The experimental results show that the calcium sulfate precursors are prepared by the reverse feed mode in which the sodium sulfate solution drop into the calcium chloride solution under the solution concentration 0.6 mol/L and the molar ratio of Na2SO4 to CaCl2 at 1:1.8. The precursors were placed in pH=6.12 hydrothermal environments and treated in the autoclave at 140 °C for 4 h to obtain the calcium sulfate whiskers having for the ratio of length to diameter at 97.5 and the better morphology.

Abstract: Several acetate esters were synthesized by reacting sugars, i.e. glucose, soluble starch, and dextrin, with acetic anhydride in the presence of some catalysts. Their structures were confirmed by IR and MS. Influences of the reaction conditions, such as catalyst and its dosage, reaction time, reaction temperature and acetic anhydride content, on the value of degree of substitution (DS) and the yield for starch acetates had also been investigated. Results showed that glucose could be easily completely acetylated; acidic catalyst tended to form a configuration of α-glucose penta-acetate (α-GPA), while alkaline catalyst β-GPA. However, soluble starch and dextrin were more difficult to be completely substituted by acetic anhydride. The DS value of soluble starch was below 2; for dextrin, its DS value could reach 2.3, close to the theoretical value of 3. An appropriate reaction temperature and reaction time were important for high yield as well as high DS value.

Abstract: We investigated hydrogen radical copper cleaning via the hot-wire method using only a rotary pump for the vacuum exhaust system. The copper oxide surface was successfully reduced. The treatment also increased the resistance of copper to oxidation.

Abstract: A modified electrode was prepared by the electrodeposition of a lead oxide layer on a titanium substrate. Characterize the electrochemical performance of electrode by adopting CHI860D electrochemistry workstation while evaluating the electro-catalytic performance of electrode with Methylene Blue (MB for short) solution as target degradation product. The results show that the interlayer proportion of SnCl4:SbCl3 is 6:1 when the thermal decomposition temperature is 550°C, the electrode material prepared in plating solution with a concentration of 0.15mol/L has excellent electrocatalytic performance against MB, and the degradation rate could reach above 98%.

Abstract: The plasma electrolytic oxidation(PEO) process of the potassium fluorozirconate electrolyte were investigated with disodium hydrogen phosphate used as additives. Ceramic films were prepared on magnesium alloy in electrolytes with different content of disodium hydrogen phosphate under constant voltage. The effect of disodium hydrogen phosphate on the pH of the electrolyte and the dissolution of the substrate were investigated. It was found that disodium hydrogen phosphate could influence the pH and dissolved magnesium ions significantly.

Abstract: When synthetizing 2 - hydroxy - 6 - naphthoic acid with 2 - naphthol as raw material , we use a variety of methods to characterize and analyze the intermediates and target product . Through melting point method, the melting point of HNA we synthetized is showed to be slightly lower than standard samples. High performance liquid chromatographic shows that the purity of 2 - methoxy - 6 - naphthoic acid 2 - hydroxy - 6 - naphthoic acid reach up to 81.98% and 99.0% respectively. The purity of 2-hydroxyl-6-naphthoic acid is showed to be 97.1% with ultraviolet spectrophotometry.

Abstract: Ti doped ITO (ITO:Ti) thin films were fabricated on glass substrates by RF magnetron sputtering using only one piece of ITO:Ti ceramic target at different substrate temperature (Ts). The effect of substrate temperature on structural, electrical, and optical properties of the films was investigated. It is confirmed that the resistivity of the films decreases with the increase of Ts till the minimum value of 2.5×10-4 Ω•cm and the transmittance in visible wavelengths is higher than 90%. "Blue shift" and "red shift" of UV absorption edge of the film were observed when Ts200 °CHeaders and footers

Abstract: ZnO:(Al, F) thin films on glass substrates have been prepared by RF magnetron sputtering. The influence of substrate temperature on the microstructure,optical and electrical properties of ZnO(Al,F) films have been studied. The effects of substrate temperature on structure and optical and electronical properties of ZnO:Al:F thin films were investigated by XRD,SEM,UV-Visible spectrophotometry and four-point proble method.Experimental results indicate that substrate temperature affects the structure and properties of the thin films considerably.The lowest resistivity obtained in this study was 9.95×10-3 Ω∙cm for the film with average visible transmittance of 90% which was deposited at the substrate temperature of 300°C.