期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 294, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2019.109863
关键词
Insulation; Dihydroxybenzene; Hydrophobic; Textural property; Mechanical property
类别
资金
- Yonsei University Research Fund [2018-12-0015]
- Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-TA1703-04]
Designing aerogel materials with excellent mechanical robustness while maintaining their basic characteristics, is of great importance for applications in energy saving management systems. Organic modification is required to strengthen silica aerogel, but the modified aerogels show decreased textural properties due to phase separation between organic-inorganic components. We report, the fabrication of organically modified aerogels without minimizing their basic properties, based on tetraethoxysilane (TEOS) and a bifunctional precursor prepared from dihydroxybenzene and TEOS via acid catalyst. Three types of dihydroxybenzene isomers were used to study the effect of the position of the hydroxyl groups on textural properties of aerogels and compatibility of the precursors. A simple, efficient, and cost effective sol-gel method was employed to develop porous aerogels with no additives and surfactants. Hydroquinone-TEOS (HT) bridged silica aerogels exhibited improved mechanical strength, low dipole moment, high specific surface area (1154 m(2)/g), high porosity (96%), low density (0.061 g/cm(3)), and ultra-low thermal conductivity of 0.0334 W/m.K. In addition, precursor was cheaper than the other isomers. The prepared aerogels show hydrophobic nature without the use of harmful silylating reagents.
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