Advanced Materials Research Vols. 960-961

Abstract: This paper described the properties of porous aluminum titanate (AT) ceramics. The AT samples with composition of 41 wt% Al₂O₃, 50 wt% TiO₂, 4.5 wt% MgO and 4.5 wt% Fe₂O₃ while 0~60 wt% graphite was used as pore former. The pore structures of the samples sintered at 1250~1350 ^oC were analyzed by scanning electron microscopy and Hg porosimetry, while the crystal phases of the aluminum titanate were analyzed by X-ray diffraction. After sintered at, the samples have open porosities of 25~51%, depending on the graphite amount and the sintering temperature. The porosity increases and the flexural strength decreases with the increasing amount of graphite.

Abstract: The aim of this study is to investigate the changes of chemical compositions in the process of simulation shark fin. The simulation shark fin was produced by tilapia fishtail; whose main chemical compositions were collagen and chondroitin sulfate (CS). The study indicated that both of them had different change trend in the process of simulation. The process of softening had main effect on the content of collagen, the higher of ice acetic acid concentration, the lower of the level of collagen. The content of CS was related to the process of obtaining wings, and the high temperature would induce a reduction of CS. The content of collagen and CS could be maintained efficiently by improving the processing technology of simulation shark fin.

Abstract: It is a kind of high efficiency and energy saving new method to prepare high purity magnesium oxide (MgO) with magnesium carbonate tri-hydrate (MgCO₃·3H₂O) as intermediate. Our research group had already designed orthogonal experimental and got the optimal process conditions of MgCO₃·3H₂O. The operating parameters such as temperature, pH and reaction time had been further optimized in this paper. Intermediate MgCO₃·3H₂O with high aspect ratio and good settling performance was synthesized at the optimal temperature 40-50°C,the optimal pH 8.8-9.0, the optimal reaction time70min, the optimal condition also applied to brine system.

Abstract: The bagasse xylan is a polysaccharide that occurs in nature in enormous amount in various one year-and perennial plants. Versatile ways to generate bio-based functional polymers result from the chemical modification of this biopolymer. The crosslinking etherification bagasse xylan (CEBX) has been synthesized by using aqueous solution polymerization method. It implies the use of sodium hydroxide, chloroacetic acid as a carboxymethylating agent and epichlorohydrin as crosslinking agent. The DS values of Carboxymethylated xylan up to 0.59 can be controlled by adjusting the molar ratio in a two step syntheses. Crosslinking etherification bagasse xylan are water soluble at a DS of 0.3. The result showed that the final product had excellent surface activity. IR spectrometry were applied to characterize the carboxymethyl xylans in detail, and revealed characteristic absorption peaks at 1600, 1426 and 1324cm⁻¹.

Abstract: In this paper, the SiN film was deposited on Si wafer, and the deposition rate of the SiN film was discussed with different parameters such as the sputtering power, deposition temperature, deposition pressure and ratio of N₂/(N₂+Ar). The result showed that the optimal parameter for SiN film were 60W, 300°C, 2.5% and 1Pa, respectively.

Abstract: Combining the application of tea saponin in short pre-treatment of cotton fabric, the chemical reaction characteristics and mechanism of one-bath process were discussed. The impact of various parameters on the one bath process with tea saponin was analysed, and the optimum process prescription was obtained: tea saponin 40 g/L, penetrating agent JFC 5 g/L, scouring agent YS198 6 g /L and hydrogen peroxide stabilizing agent GJ-101 4 g/L. By tea saponin qualitative analysis, the action mechanism of tea saponin in one bath pretreatment was proposed.

Abstract: Ir/AlO(OH)/Fe₃O₄ catalyst has been prepared and applied for the hydrogenation of p-choronitrobenzene (p-CNB) to p-chloroaniline (p-CAN) at 35 °C and balloon hydrogen pressure in ethanol/water mixture. The experiment results indicated that the catalyst Ir/AlO(OH)/Fe₃O₄ showed excellent catalytic properties for the hydrogenation of p-CNB to p-CAN. A complete conversion of p-CNB was achieved with a selectivity of 97.2 % to p-CAN. The catalyst was quite stable and can be recycled at least seven times without loss of any activity. Moreover, the magnetic property of the catalyst facilated the separation of the used catalyst from the reaction system without filtration.

Abstract: Fe_xO_y@C nanocomposites were synthesized and used as carriers for depositing Pt nanoparticles. Catalytic properties of the nanocomposites were investigated for the hydrogenation of p-chloronitrobenzene at room temperature and balloon hydrogen pressure. The catalyst Pt/Fe_xO_y@C was extremely active for the hydrogenation of p-chloronitrobenzene. Completely conversion of p-chloronitrobenzene was achieved with a selectivity of 99.7 % in ethanol-water mixture in a reaction time of 40 min. Moreover, it can be reused four times without loss of any activity.

Abstract: In this paper, Au/C and Au-Pd/C catalysts were prepared respectively. The catalytic performance for the oxidation of glyoxal to glyoxylic acid has been investigated. Furthermore, these catalysts were characterized by XRD and XPS. The results demonstrate that, the conversion of glyoxal was 58.9% and the yield of glyoxylic acid was 13.7% at the optimum reaction time of 20h, which implied the bimetallic catalyst showed higher performance than the monometallic catalyst obviously.

Abstract: This paper is mainly to discuss that myclobutanil as corrosion inhibitor and its corrosion efficiency were evaluated via electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The potentiodynamic polarization measurements showed that the inhibition efficiency increases sharply with the increasing of concentration of myclobutanil, and the highest inhibition efficiency of the myclobutanil reached 84.3% at 3.2×10^-4 mol/L in 1 mol/L HCl. The result also indicated that myclobutanil belongs to the mixed type inhibitor. The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization.