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Elastic silica aerogel using methyltrimethoxysilane precusor via ambient pressure drying

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Abstract

The use of N,N-dimethylformamide (DMF) as a drying control chemical additive was found to be effective in obtaining methyltrimethoxysilane (MTMS) based silica aerogels in terms of excellent monolithic property, hydrophobicity and elasticity. The aerogels were produced by hydrolysis and condensation of methanol diluted MTMS in presence of ammonia catalyst followed by ambient drying. The molar ratio of DMF/MTMS varies from 0 to 1. It has been observed that higher DMF/MTMS value leads to lower density (~0.15 g/cm3) and higher porosity of aerogels with excellent hydrophobicity. For DMF/MTMS (~0.6) values, monolithic and elastic aerogels which can recover to their original shapes after compression were obtained. Narrower and more uniform pore size distribution was observed for the DMF modified aerogels in our study.

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Authors and Affiliations

  1. State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China

    Long Cai & Guorong Shan

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  1. Long Cai
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  2. Guorong Shan
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Correspondence to Guorong Shan.

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Cai, L., Shan, G. Elastic silica aerogel using methyltrimethoxysilane precusor via ambient pressure drying. J Porous Mater 22, 1455–1463 (2015). https://doi.org/10.1007/s10934-015-0026-6

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