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Journal of Sol-Gel Science and Technology

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18-01-2018 | Original Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)

Synthesis of high-temperature resistant monolithic zirconia-based aerogel via facile water glass assisted sol–gel method

Authors: Haibo Gao, Zhiyi Zhang, Zhenyu Shi, Jiazheng Zhang, Mingjia Zhi, Zhanglian Hong

Published in: Journal of Sol-Gel Science and Technology | Issue 3/2018

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Abstract

Zirconia aerogel monolith was prepared by a facile co-hydrolysis method, which adopts ZrOCl₂ as the precursor and water glass (Na₂SiO₃) as the gel initiator. ZrO₂ aerogel was formed by rational controlling of the hydrolysis rate of Zr⁴⁺ ions by Na₂SiO₃. The obtained aerogel consists of ZrO₂ nanoparticles surrounded by amorphous SiO₂ nano shell. The density and the surface area can be well tuned by adjusting the ratio of ZrOCl₂ to Na₂SiO₃. The in-situ introduced SiO₂ nano shell layer acts as the particle boundary reinforcement phase, which not only strengths the ZrO₂ particle connections to form monolith, but also significantly mitigates the sintering of ZrO₂ nanoparticles at high temperature. As a result, the zirconia aerogel prepared by such method could maintain its nanoporous microstructure up to 1000 °C.

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Title: Synthesis of high-temperature resistant monolithic zirconia-based aerogel via facile water glass assisted sol–gel method
Authors: Haibo Gao
Zhiyi Zhang
Zhenyu Shi
Jiazheng Zhang
Mingjia Zhi
Zhanglian Hong
Publication date: 18-01-2018
Publisher: Springer US
Published in: Journal of Sol-Gel Science and Technology / Issue 3/2018
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-017-4571-0

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