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Molecules 2018, 23(8), 1935; https://doi.org/10.3390/molecules23081935

Preparation of Silica Aerogels by Ambient Pressure Drying without Causing Equipment Corrosion

1
College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China
2
State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing 100024, China
*
Authors to whom correspondence should be addressed.
Received: 17 June 2018 / Revised: 30 July 2018 / Accepted: 31 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Chemistry of Aerogels and Their Applications)
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Abstract

The silica aerogels were prepared via a sol-gel technique and ambient pressure drying by using industrial solid wastes, dislodged sludges, as raw materials. A strategy was put forward to reduce the corrosion of equipment during the drying procedure. The pore structure, hydrophobicity, and thermal insulation property of the obtained samples were investigated in detail. The results show that the corrosion can be effectively avoided by using an equimolar mixture of trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDS) as silylation agents. At a Si:TMCS:HMDS molar ratio of 1:0.375:0.375, the silica aerogels possess a desirable pore structure with a pore volume of 3.3 ± 0.1 cm3/g and a most probable pore size of 18.5 nm, a high hydrophobicity with a water contact angle of 144.2 ± 1.1°, and a low thermal conductivity of 0.031 ± 0.001 W/(m∙K). View Full-Text
Keywords: silica aerogel; corrosion; silylation agent; ambient pressure drying silica aerogel; corrosion; silylation agent; ambient pressure drying
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhu, L.; Wang, Y.; Cui, S.; Yang, F.; Nie, Z.; Li, Q.; Wei, Q. Preparation of Silica Aerogels by Ambient Pressure Drying without Causing Equipment Corrosion. Molecules 2018, 23, 1935.

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