支撑沸石分子筛膜的研究进展

支撑沸石分子筛膜具有优良的择形分离与催化性能,且具有耐高温、抗化学侵蚀性强及机械强度高等特点,在膜分离和膜反应中的应用前景广阔;此类无机膜还可作为原子簇和超分子化合物的纳米组装基体,在制备具有特殊功能的光学和电化学材料等方面具有潜在的重要用途.本文综合评述了支撑分子筛膜的研究进展,阐述了支撑分子筛膜的水热合成方法(包括原位合成法和晶种法)及定向生长机理,讨论了最具开发潜力的A型和MFI型支撑沸石膜的合成条件及其与膜结构的关系,提出了需要进一步解决的问题和今后的主要研究方向.     

Lattice Dynamics of Chalcopyrite Type Compounds Part IV. Calculations of TO Phonon Modes in a Reduced Rigid Ion Model

The lattice dynamics of 12 chalcopyrite type compounds CuAlS₂, CuGaS₂, CuInS₂, AgGaS₂, AgGaSe₂, AgInSe₂, ZnSiP₂, ZnGeP₂, CdSiP₂, CdGeP₂, CdSnP₂, and CdGeAs₂ have been investigated based on a 5‐parameter model involving two short range stretching force constants, an interaction constant, and the effective dynamic charges of the cations. The calculated force constants, normal co‐ordinates and potential energy distributions are compiled and discussed.