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
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%