以多聚硅为硅源，通过溶胶-凝胶、表面修饰及超临界干燥过程制备出了疏水型ＳｉＯ２气凝胶．表面修饰后ＳｉＯ２气凝胶孔洞由修饰前的２３．１ｎｍ减小到１８．２ｎｍ；比表面积由修饰前的 ４７７ｍ２ｇ－１增加到 ５６３ｍ２ｇ－１，骨架颗粒比修饰前略大，饱和水蒸汽吸附量由吸附前的０．０４（重量比）降低到０．００１２，且与水不浸润．
Hydrophobic SiO2 aerogels were produced by the surface modification of alcogels prepared via sol-gel process using polyethoxydisiloxanes (E-40) as
the precursor and followed by ethanol supercritical drying. The structure of the modified silica aerogels was a silica matrix produced by hydrolysis and
condensation of polyethoxydisiloxanes. Si-CH3 was modified on the surface of the silica matrix. The pore size decreased from 23.1nm to 18.2nm, the
specific surface area increased from 477 m2·g-1 to 563 m2·g-1 and the water vapor adsorption decreased from 0.04 to 0.0012(weight ratio)
after the surface modification of silica aerogels. The existence of Si-CH3 was observed using infrared spectra.
参考文献
| [1] | Hrubesh L W. Journal of Non-Crystalline Solids， 1998?， 225： 335--342. [2] Schmidt M, Schwertfeger F. Journal of Non-Crystalline Solids?， 1998， 225： 364--368. [3] 邓忠生，王珏，沈军等(DENG Zhong-Sheng, et al). 无机材料学报(Journal of Inorganic Materials), 1999, 11 (4): 587--592. |
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