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Article

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

by
Lixiao Zhu
1,
Yali Wang
1,*,
Suping Cui
1,
Feihua Yang
2,*,
Zuoren Nie
1,
Qunyan Li
1 and
Qi Wei
1,*
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.
Molecules 2018, 23(8), 1935; https://doi.org/10.3390/molecules23081935
Submission 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).
Keywords: silica aerogel; corrosion; silylation agent; ambient pressure drying silica aerogel; corrosion; silylation agent; ambient pressure drying
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MDPI and ACS Style

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. https://doi.org/10.3390/molecules23081935

AMA Style

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(8):1935. https://doi.org/10.3390/molecules23081935

Chicago/Turabian Style

Zhu, Lixiao, Yali Wang, Suping Cui, Feihua Yang, Zuoren Nie, Qunyan Li, and Qi Wei. 2018. "Preparation of Silica Aerogels by Ambient Pressure Drying without Causing Equipment Corrosion" Molecules 23, no. 8: 1935. https://doi.org/10.3390/molecules23081935

APA Style

Zhu, L., Wang, Y., Cui, S., Yang, F., Nie, Z., Li, Q., & Wei, Q. (2018). Preparation of Silica Aerogels by Ambient Pressure Drying without Causing Equipment Corrosion. Molecules, 23(8), 1935. https://doi.org/10.3390/molecules23081935

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