排序方式: 共有35条查询结果,搜索用时 31 毫秒
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有机小分子模板法合成二氧化钛中孔材料 总被引:24,自引:0,他引:24
1992年美国Mobil公司[1,2]首次以表面活性剂为模板,合成出具有特定孔道结构和规则孔径的中孔分子筛.近7年来以离子或中性表面活性剂为模板制备硅中孔或过渡金属掺杂的中孔材料的报道层出不穷[3,4].由于这些材料的孔径较大,分布均匀,以及过渡金属的特殊催化性能使其在分离或催化中得到应用.1998年Wei[5]等首次以葡萄糖、麦芽糖和酒石酸衍生物等非表面活性剂有机分子为模板,制备出高比表面积,孔径可调,窄孔径分布的中孔二氧化硅分子筛.由于有机小分子种类繁多,后处理方便,且有的对环境友好,这为中孔材料的制备提供了一种新方法.迄今为止,以过… 相似文献
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在不同温度下,用甘油常压热处理层状水合钛酸(H2Ti4O9·nH2O)制备了TiO2纤维,并用XRD进行了表征.结果表明,经60,150和250℃甘油热处理后,样品的主晶相均为2Ti8O17,得到有较大比表面积和有微孔结构的TiO2纤维;当处理温度为150℃时,制得的TiO2纤维比表面积由原来的30m2/g增大到127m2/g,其中小于1nm的微孔比表面积为79m2/g.以甲基橙为代表物,考察了TiO2纤维的光催化活性.与在空气中热处理相比,甘油常压热处理提高了TiO2纤维的光催化氧化活性,其降解甲基橙的能力优于P-25. 相似文献
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二羟丙酮的气相色谱分析 总被引:1,自引:0,他引:1
用衍生气相色谱法测定了二羟丙酮的酶制法体系中二羟丙酮的含量,选用六甲基二硅胺烷(HMDS)、六甲基二硅胺烷加三甲基氯硅烷(TMCS)、N,O-双(三甲基硅烷基)乙酰胺(BSA)为衍生试剂,并对其衍生条件进行了研究。该法的回收率为98.31%~101.31%,RSD为2.02%~3.58%。 相似文献
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The conductivities of binary mixtures of glycerine and water were measured at 20°C by means of a transient method. The equation
describing the correlation between concentration and thermal conductivity was determined. The equation can be used for determining
concentrations in mixtures. The results show that (1) the error in the determination of the molar concentration of water in
mixtures is less than 1%, (2) the time of measurement is 1 s, (3) this method can be used for on-line analysis in production
control.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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G. Vaivars M. Furlani B.-E. Mellander C. G. Granqvist 《Journal of Solid State Electrochemistry》2003,7(10):724-728
This work reports on a proton gel electrolyte composed of zirconium phosphate (ZP) particles suspended in a poly(vinyl acetate)/glycerine matrix. The material was studied by X-ray powder diffraction, differential scanning calorimetry, impedance spectroscopy, and spectrophotometry. It had a proton conductivity of 1–0.1 mS/cm at room temperature and remained stable and transparent up to at least 110 °C; it therefore appears suitable for uses in electrochromic devices. The structure of the ZP powder and of the gel is discussed in terms of water removal from interplanar spaces by heating or exfoliation. It is suggested that an exfoliation of the layered structure of ZP by intercalation of glycerine produces a dispersion of ZP nanoparticles in the poly(vinyl acetate)/glycerine matrix. 相似文献