Journal
MATERIALS LETTERS
Volume 204, Issue -, Pages 93-96Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2017.05.104
Keywords
Porous materials; Sol-gel preparation
Funding
- National Natural Science Foundation of China [11372263]
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A novel inexpensive and green method was developed to rapidly prepare methyltriethoxysilane (MTES) based flexible silica aerogel monoliths via ambient pressure drying. By controlling the amounts of MTES, ethanol and water without the conventional complex steps of surface modification and solvent exchange, the silica aerogel monoliths with excellent integrity, flexibility and compressibility were obtained. Benefiting from the appropriate numbers of methyl groups contained in MTES, this method could well maintain the monolithic structure when dried at an atmospheric pressure. The density of 0.10 g/cm(3) with the porosity of 95.5% and the thermal conductivity as low as 0.038 W/(mK)could be achieved. The total unrecoverable strain loss was 10% after 20-cycle continuous compression upon 50%-strain loading. (C) 2017 Elsevier B.V. All rights reserved.
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