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Molecules 2018, 23(5), 1178; https://doi.org/10.3390/molecules23051178

Cast-In-Situ, Large-Sized Monolithic Silica Xerogel Prepared in Aqueous System

Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology & School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
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Received: 21 April 2018 / Revised: 12 May 2018 / Accepted: 12 May 2018 / Published: 15 May 2018
(This article belongs to the Special Issue Sol-Gel Chemistry. From Molecule to Functional Materials)
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Abstract

This paper reports the preparation of cast-in-situ, large-sized monolithic silica xerogels by a two-step acid–base catalyzed approach under ambient pressure drying. Low-cost industrial silica sol and deionized water were used as the silicon source and the solvent, respectively. Hexadecetyltrimethylammonium bromide (CTAB) was used as a modification agent. Different amounts of polyethylene glycol 400 (PEG400) was added as a pore-forming agent. The prepared silica xerogels under ambient pressure drying have a mesoporous structure with a low density of 221 mg·cm−3 and a thermal conductivity of 0.0428 W·m−1·K−1. The low-cost and facile preparation process, as well as the superior performance of the monolithic silica xerogels make it a promising candidate for industrial thermal insulation materials. View Full-Text
Keywords: silica sol; surfactant; binder and pore-forming agent; ambient pressure drying silica sol; surfactant; binder and pore-forming 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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Ding, W.; Wang, X.; Chen, D.; Li, T.; Shen, J. Cast-In-Situ, Large-Sized Monolithic Silica Xerogel Prepared in Aqueous System. Molecules 2018, 23, 1178.

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