钼钨铌磷杂多化合物的研究（Ⅰ）：杂多酸的合成和表征

提出了分步酸化一分步加料合成[PNb_2Mo_xW_(10-x)O_(40)]~(5-)(x=0,2,4,6)系列杂多酸的方法,给出了最佳配料比和生成反应的pH值,并进行了红外、紫外、极谱、电位滴定及热稳定性研究。     

乙基苯基二氯化锡与2－羟基萘醛缩对甲氧基苯胺Schiff碱1∶1配合物的合成和晶体结构

乙基苯基二氯化锡与２－羟基萘醛缩对甲氧基苯胺Ｓｃｈｉｆｆ碱１∶１配合物的合成和晶体结构刘宝殿，包明，孙振刚，贺庆林，邢彦，贾恒庆，林永华（东北师范大学化学系，长春，１３００２４）（中国科学院长春应用化学研究所，长春）关键词乙基苯基二氯化锡，Ｓｃｈｉｆ...     

聚对苯二甲酸乙二酯形态结构的光散射研究

在不同结晶条件下,聚对苯二甲酸乙二酯样品出现了三种不同的光散射图形(正常球晶、异常球晶和混合球晶散射图形)。并假定正常球晶的光轴方向与半径垂直;异常球晶的光轴方向与半径夹+45°角或-45°角;混合球晶则是正常球晶与异常球晶叠加的结果。基于这些假定,按照Clough的计算公式,用二维球晶模型分别对具有上述各种光轴取向的球晶进行了计算。结果表明,计算出的H_v、V_v散射图形与实验所得的散射图形符合得很好。偏光显微镜的观察结果也进一步证实了这些模型的假定。     

Carbon Nanotubes Grown on Sepiolite as Catalyst Carrier

Multi-walled carbon nanotubes were synthesized by the catalytic decomposition of acetylene at 750℃ over sepiolite powder,which was treated with aqueous cobalt nitrate. It is expected that the composite with high specific area will have high capacity of hydrogen storage.     

Visible light induced photocatalytic reaction of rhodamine B dye via 12-tungstosilicic acid in water

Using 12-tungstosilicic acid (SiW124-) as the catalyst, rhodamine B (RhB) dye in an aerated aqueous solution can undergo an effective photocatalytic stepwise N-deethylation process under visible light irradiation, and dioxygen is reduced to hydrogen peroxide by the reducedSiW12 4-. This provides the potential for moving polyoxometalate-based photocatalytic processes from the near-UV into the visible region of the spectrum.     

Isolation of lipase producer and its performance in enantioselective hydrolysis of glycidyl butyrate

A racemic glycidyl butyrate resolving strain, preliminarily identified as a Rhizopus sp., had been isolated from soil. Its extracellular lipase was found to enantioselectively hydrolyze the (S)-enantiomer of the chiral ester, with optimal activities at pH 5.3 and 42°C. Higher en antioselectivity of theenzyme was observed at lower temperatures, while the best anantioselectivity was obtained at pH 5.5–6.0, with an, E value (enantiomeric ratio) of 57.     

Characterization of charge neutralization reaction in aqueous solution using the membrane separation method

Colloid titration and streaming current detector are two popular techniques used to determine the charge density of dissolved and colloidally dispersed polyelectrolytes. However, both techniques are based on some assumptions that may not be valid under some circumstances. In this paper, a membrane separation technique developed to determine the charge density and characterize a charge neutralization reaction is described. The technique characterizes the reaction between cationic and anionic charge carriers by measuring the counterions released during reaction or the unreacted small molecule charge carriers. Membranes with selected cutoff pore size were used to separate the species of interest from the bulk of the reaction mixture. Three different charge determination techniques were also compared.