【作者】 刘红霞； 唐帆； 邵荣； 董锐； 贾铭琳； 陈松；

【Author】 LIU Hong-xia~1,TANG Fan~1,SHAO Rong~1,DONG Rui~1,JIA Ming-lin~2,CHEN Song~1 (1.Chemical and Biological Engineering College,Yancheng Institute of Technology,Yancheng 224003,China; 2.Shanghai Fenghui Saving Energy and Protecting Environment Co.Ltd.,Shanghai 201204,China)

【机构】 盐城工学院化生学院； 上海丰慧节能环保科技有限公司；

【摘要】 以廉价的工业级正硅酸乙酯为原料,经过酸碱两步催化制备SiO₂凝胶,以三甲基氯硅烷/六甲基二硅氧烷混合液对凝胶进行直接改性,常压干燥下得到高比表面积疏水性SiO₂气凝胶。用IR、N₂吸附、接触角的测定等分析方法对SiO₂化学成分、比表面积和疏水性能进行了研究。结果表明,经改性后的样品表面存在憎水性基团（-CH₃）,具有良好的疏水性能,比表面积达到931.29m²/g。更多还原

【Abstract】 Silica gel was prepared by acid-base two step catalysis using cheap industrial tetraethyl orthosilicate （TEOS） as precursor,the obtained silica gel was directly modified by using trimethylchlorosilane/ hexamethyl-disiloxane （TMCS/ HMDSO） mixed solution,the obtained modified gel was then dried at ambient atmosphere to prepare hydrophobic SiO₂ aerogel with a high specific surface area.The chemical compisites,hydrophobic property of the modified silica aerogel had been studied by the IR,N₂ phycial absorbtion and the determination of contact angle.The results showed that the modified samples had a good hydrophobic property because of the hydrophilic group（—CH₃） that was linked to the aerogel’s surface.The specific surface area of the sample with high thermal stability was up to 931 m²/g.更多还原