Preparation and characterization of organic-inorganic hybrid flexible silica aerogel

doi:10.3969/j.issn.0438-1157.2014.01.045

CIESC Journal ›› 2014, Vol. 65 ›› Issue (1): 346-351.DOI: 10.3969/j.issn.0438-1157.2014.01.045

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Preparation and characterization of organic-inorganic hybrid flexible silica aerogel

QU Kang, PU Qun, SHAN Guorong

State Key Laboratory of Chemical Engineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2013-06-05 Revised:2013-07-08 Online:2014-01-05 Published:2014-01-05
Supported by:
supported by State Key Laboratory of Chemical Engineering(SKL-ChE-12D04) and Innovation Research Team of Zhejiang Province (2009R50016).

有机-无机杂化柔性硅气凝胶的制备与表征

曲康, 浦群, 单国荣

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

通讯作者: 单国荣
作者简介:曲康（1987-），男，硕士研究生。
基金资助:
化学工程联合国家重点实验室开放课题项目（SKL-ChE-12D04）；浙江省科技创新团队项目（2009R50016）。

Abstract

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%.

Key words: silica, methyltrimethoxysilane, supercritical fluid, stability, flexible

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%。

关键词: 二氧化硅, 甲基三甲氧基硅烷, 超临界流体, 稳定性, 柔性

CLC Number:

TQ328.9

QU Kang, PU Qun, SHAN Guorong. Preparation and characterization of organic-inorganic hybrid flexible silica aerogel[J]. CIESC Journal, 2014, 65(1): 346-351.

曲康, 浦群, 单国荣. 有机-无机杂化柔性硅气凝胶的制备与表征[J]. 化工学报, 2014, 65(1): 346-351.

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Preparation and characterization of organic-inorganic hybrid flexible silica aerogel

有机-无机杂化柔性硅气凝胶的制备与表征

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