Study on Silica Aerogel Modified by Trimethylchlorosilane
Abstract The mechanical properties of SiO 2 aerogel prepared under atmospheric pressure are poor, so it is difficult to prepare large pieces of materials for practical engineering. In this paper, trimethylchlorosilane (TMCS) was used as a surface modifier to transform hydrophilic substances with hig...
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Published in | Journal of physics. Conference series Vol. 2393; no. 1; pp. 12026 - 12032 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Bristol
IOP Publishing
01.12.2022
|
Subjects | |
Online Access | Get full text |
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Summary: | Abstract
The mechanical properties of SiO
2
aerogel prepared under atmospheric pressure are poor, so it is difficult to prepare large pieces of materials for practical engineering. In this paper, trimethylchlorosilane (TMCS) was used as a surface modifier to transform hydrophilic substances with higher surface activity into hydrophobic groups, to improve the network strength of SiO
2
aerogel. Super-hydrophobic SiO
2
aerogel was prepared by the sol-gel method under atmospheric pressure. The effects of trimethylchlorosilane on the structure and properties of SiO
2
aerogel were characterized by a specific surface area analyzer, Fourier transform infrared spectrometer, thermal conductivity meter, static contact angle meter, and scanning electron microscope. The results show that the SiO
2
aerogel prepared when n (Si):n (TMCS) is 1 has the best performance. Its density is as low as 0.0759 g/cm
3
, the porosity is as high as 96.5%, the specific surface area is as high as 723.08 m
2
/g, and the contact angle is 163.8°. It has good hydrophobic properties. |
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ISSN: | 1742-6588 1742-6596 |
DOI: | 10.1088/1742-6596/2393/1/012026 |