通过控制醇凝胶强度常压制备低密度疏水SiO2气凝胶

doi:10.11949/j.issn.0438-1157.20150057

化工学报 ›› 2015, Vol. 66 ›› Issue (10): 4281-4287.DOI: 10.11949/j.issn.0438-1157.20150057

• 材料化学工程与纳米技术 • 上一篇下一篇

通过控制醇凝胶强度常压制备低密度疏水SiO₂气凝胶

吴会军^1,2, 胡焕仪¹, 陈奇良^1,2, 王靖³, 向兰³

1 广州大学土木工程学院, 广东广州 510006;
2 广州大学广东省建筑节能与应用技术重点实验室, 广东广州 510006;
3 清华大学化学工程系, 北京 100084

收稿日期:2015-01-14 修回日期:2015-04-29 出版日期:2015-10-05 发布日期:2015-10-05
通讯作者: 吴会军
基金资助:
广东省自然科学杰出青年基金项目(S2013050014139);广东省重大科技专项(2012A010800033);广东省教育厅科技创新项目(2013KJCX0141)。

Preparation of low density hydrophobic silica aerogels bycontrolling strength of alcogels

WU Huijun^1,2, HU Huanyi¹, CHEN Qiliang^1,2, WANG Jing³, XIANG Lan³

1 School of Civil Engineering, Guangzhou University, Guangzhou 510006, Guangdong, China;
2 Guangdong Key Laboratory of Building Efficiency and Application Techniques, Guangzhou University, Guangzhou 510006, Guangdong, China;
3 Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2015-01-14 Revised:2015-04-29 Online:2015-10-05 Published:2015-10-05
Supported by:
supported by the Guangdong Natural Science Funds for Distinguished Young Scholar(S2013050014139), Major Research Project of Guangdong Province (2012A010800033) and Research Project of Guangdong Provincial Department of Education (2013KJCX0141).

摘要/Abstract

摘要：

常压干燥制备低密度气凝胶是促进高性能气凝胶发展应用的重要途径。以正硅酸乙酯为硅源,采用溶胶-凝胶和常压干燥工艺制备出低密度(<100 kg·m^-3)的疏水SiO₂气凝胶,通过工艺参数的控制制备出不同压缩模量的醇凝胶,探讨了反应物配比对醇凝胶压缩模量和气凝胶密度间的影响关系,获得了通过控制醇凝胶压缩模量制备低密度疏水SiO₂气凝胶的方法;发现将醇凝胶压缩模量控制在0.25~2.5 kPa范围内,可制备出密度小于100 kg·m^-3的疏水SiO₂气凝胶,该研究可以为低密度疏水SiO₂气凝胶的低成本常压制备及其控制方法提供指导。

关键词: 气凝胶, 压缩模量, 常压干燥, 二氧化硅, 纳米材料

Abstract:

Preparation of aerogels via ambient pressure drying has well been acknowledged as an extremely important way to the development and application of high performance silica aerogels. Low density (<100 kg·m^-3) and hydrophobic silica aerogels were successfully prepared via sol-gel process and ambient pressure drying by using tetraethyl ortho silicate as silica precursor. Various silica alcogels with different compression modulus were prepared by varying preparing parameters. Effects of preparing parameters on the compression modulus of silica alcogels and the density of as-prepared silica aerogels were studied. The preparing method of low density and hydrophobic aerogels by controlling the compression modulus of alcogels was accordingly explored. The results indicated that the low-density and hydrophobic silica aerogel (<100 kg·m^-3) could be prepared by controlling the compression modulus of the Alcogels within the range of 0.25~2.5 kPa. This finding provided valuable guidance for the preparation and control of low-density and hydrophobic silica aerogels via low-cost ambient pressure drying.

Key words: aerogels, compression modulus, ambient pressure drying, silica, nanomaterials

中图分类号:

TB303

吴会军, 胡焕仪, 陈奇良, 王靖, 向兰. 通过控制醇凝胶强度常压制备低密度疏水SiO₂气凝胶[J]. 化工学报, 2015, 66(10): 4281-4287.

WU Huijun, HU Huanyi, CHEN Qiliang, WANG Jing, XIANG Lan. Preparation of low density hydrophobic silica aerogels bycontrolling strength of alcogels[J]. CIESC Journal, 2015, 66(10): 4281-4287.

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通过控制醇凝胶强度常压制备低密度疏水SiO₂气凝胶

Preparation of low density hydrophobic silica aerogels bycontrolling strength of alcogels

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