以正硅酸四乙酯(TEOS)为前驱体,盐酸和氨水作为催化剂,通过溶胶-凝胶法制备了 Si O 2醇凝胶,再利用三甲基氯硅烷(TMCS)和正己烷(Hexane)对醇凝胶进行表面改性,最后在常压条件下干燥后制备了疏水性 Si O 2气凝胶。采用 X 射线衍射、扫描电镜(SEM)、比表面积测试(BET)、傅里叶转换红外光谱(FT-IR)等测试方法对所得样品的形貌、结构及化学组成等进行了分析。结果表明,所得 Si O 2气凝胶比表面积可达900 m2/g以上,密度＜200 kg/m3,并且具有优异的疏水性。
Hydrophobic silica alcogels were prepared with tetraethylorthosilicate (TEOS)as precursor,hydro-chloric acid and ammonia as catalysts,and trimethylchlorosilane (TMCS)and hexane as a surface modifying a-gent by drying at ambient pressure.Test methods,such as X-ray diffraction,SEM,BET,FT-IR were adopted to analyze the surface morphology,structure and chemical composition of the samples.The results show that the specific surface area of the resulting SiO2 aerogels is up 900 m2/g.The areogels have a density less than 200 kg/m3 ,and the hydrophobicity of aerogels is excellent.
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