期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 100, 期 1-3, 页码 350-355出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2006.10.026
关键词
silica aerogels; ambient pressure drying; BET; FE-SEM; FTIR; TGA-DTA; superhydrophobicity
类别
资金
- Korea Institute of Industrial Technology(KITECH) [2004-E-FM11-P-02] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We have developed a novel route to monolithic silica aerogels via ambient pressure drying by the acid-base sol-gel polymerization of methyltrimethoxysilane (MTMS) precursor. An extent of silica polymerization in the alcogels plays a crucial role in obtaining the monolithic aerogels which could be optimized by a proper control over the MeOH/MTMS molar ratio (S) during the sol-gel synthesis. The alcogel undergoes the distinct spring-back effect at the critical stage of the drying and thereby preserving the highly porous silica network without collapse. The process yields silica aerogels exhibiting very low bulk density and high specific surface area of 0.062 g/cm(3) and 520 m(2)/g, respectively. The average pore diameter and the cumulative pore volume varied from 4.5 to 12.1 nm and 0.58 to 1.58 cc/g, respectively. In addition, the aerogels are superhydrophobic with contact angle as high as 152 degrees. We anticipate that the new route of the monolithic silica aerogel production will greatly expand the commercial exploitation of these materials. (c) 2006 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据