氯离子柱撑复合氢氧化物纳米微晶的制备及属性

用共沉淀法制备前驱体后,在水热、微波和沸热等不同晶化方式下合成了一系列层状氯离子柱撑镁铝复合氢氧化物(LDH-Cl),在EDS,XRD,IR,TG-DTA,TEM和N₂吸附-解吸测试表征的基础上,讨论了LDH-Cl的组成与结构的关系及制备条件对组成、结构和性质的影响.研究结果表明:LDH-Cl具有超分子结构和水滑石型层状结构的特征;微晶生长习性在不同晶化过程中的差异决定了粒子发育程度的不同、组成与结构相关性的不同;微晶粒子在不同合成条件和晶化方式下表现了不同的结晶度水平从而引起红外吸收、热稳定性及比表面积等基本属性的变化.

Preparation and Basic Properties of Layered Double Hydroxides Intercalated by Chloride Anion

A series of layered double hydroxide compounds intercalated by chloride anion (LDH Cl) have been prepared with coprecipitation method, and the resultant precursors were matured under different crystallization pattern such as microwave, boiling thermal and hydrothermal crystallization. Structural characterization was achieved with energy dispersive microprobe analysis, X ray powder diffraction, FT IR spectra, transmission electron micrograph, thermogravimetric analysis, and BET N 2 surface area measurements in order to establish the relationship between composition and structure, and to show the influence of synthetic factor on composition, structure and property. It has been proved from different evidence that the LDH Cl had supermolecular structure and layered structure trait in common with hydrotalcite. The particle of LDH Cl possessed different crystal habit in different crystallization course, bringing about divergence of relativity between composition and structure, and the development difference among grain. This nanometer micro crystal displayed different degree of crystallinity under different preparing condition and crystallization pattern, resulting in alteration of IR absorption spectrum, thermal stability and specific surface area.