Preparation and characterization of organic-inorganic hybrid flexible silica aerogel

QU Kang; PU Qun; SHAN Guorong

doi:10.3969/j.issn.0438-1157.2014.01.045

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Preparation and characterization of organic-inorganic hybrid flexible silica aerogel

更新时间：2025-12-10

- Preparation and characterization of organic-inorganic hybrid flexible silica aerogel
- CIESC Journal Issue 1, Pages: 346-351(2014)
- 作者机构：
  
  化学工程联合国家重点实验室(浙江大学), 浙江大学化学工程与生物工程学系,浙江,杭州,310027
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.01.045
  CLC： Q328.9
- Online First：05 January 2014，
  
  Published：05 January 2014
- 稿件说明：
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QU Kang, PU Qun, SHAN Guorong. Preparation and characterization of organic-inorganic hybrid flexible silica aerogel[J]. CIESC Journal, 2014, (1): 346-351.
DOI：

QU Kang, PU Qun, SHAN Guorong. Preparation and characterization of organic-inorganic hybrid flexible silica aerogel[J]. CIESC Journal, 2014, (1): 346-351. DOI： 10.3969/j.issn.0438-1157.2014.01.045.

摘要

以甲基三甲氧基硅烷（MTMS）和四乙氧基硅烷（TEOS）为混合硅源、甲醇为溶剂，通过酸碱两步催化溶胶-凝胶法制备湿凝胶，经超临界流体干燥得到块状二氧化硅气凝胶。用扫描电镜、氮气吸附脱附测试以及热重分析等手段对气凝胶的微观形貌、比表面积、孔径分布、弯曲性、压缩性、热稳定性等进行研究，结果表明：MTMS/TEOS比例会影响气凝胶的微观结构、弯曲和压缩性以及热稳定性，以MTMS/TEOS=8/1制得的气凝胶密度为0.11 g·cm-3、孔隙率为94.2%、比表面积为693.3 m2·g-1、最大弯曲角可达92°、最大压缩比例可达41.2%、压缩回弹率为100%。

Abstract

Monolithic silica aerogels were prepared via supercritical fluid drying of methanol gels

which were obtained using the sol-gel co-precursor method with methyltrimethoxysilane (MTMS) and tetraethoxysilane (TEOS) as precursors

methanol as solvent

oxalic acid and ammonia as catalysts. The microstructure

specific surface area

pore size distribution

bending and compressibility

and thermal stability of silica aerogels were studied by scanning electron microscopy

nitrogen adsorption/desorption tests

and thermogravimetric analysis. The properties of the silica aerogels

prepared with different mole ratios of MTMS/TEOS

varied obviously. The silica aerogel

prepared with mole ratio of MTMS/TEOS at 8/1

was a flexible material with density of 0.11 g·cm-3

porosity of 94.2%

specific surface area of 693.3 m2·g-1

maximal bending angle of 92°

maximal compression ratio of 41.2% and compression spring-back of 100%.

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