二氧化硅干凝胶的制备与结构分析

Preparation and Structure Analysis of Silica Xerogels

以氢氟酸(HF)为催化剂,采用常压干燥法制备了二氧化硅干凝胶,分析了催化剂和干燥条件对干凝胶的影响。通过DTA-TG,IR,BET等测试手段对经热处理的二氧化硅干凝胶的性能进行了研究。结果表明:试样具有纳米多孔结构,并且通过改变干燥方法对比表面积和孔隙率的可提高程度很大。

The silica xerogels were synthesized by ambient pressure drying method with hydrofluoric acid（HF） as catalyzer. The influence of catalyzer and drying method on the xerogels were analyzed. The performance of heat treated silica xerogels were investigated by means of DTA-TG, IR, BET. The results showed that the samples were porous and nano-sized structure, and the degree of specific surface area and porosity could be greatly increased by changing drying methods.