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Effect of the TMCS/hydrogel volume ratio on physical properties of silica aerogels based on fly ash acid sludge

  • Original Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)
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Abstract

The silica aerogels based on the fly ash acid sludge were successfully synthesized using ethanol (EtOH)/trimethylchlorosilane (TMCS)/n-hexane as surface modification agent via ambient pressure drying. The surface modification of hydrogels was a crucial step during the processing which preserved mesopores structure in ambient pressure drying. It was found that the structure and physical properties of silica aerogels dependent on the TMCS/hydrogel volume ratio. The results indicated that the specific density decreased with an increase in the TMCS/hydrogel volume ratio. The silica aerogels modified with TMCS (volume ratio = 1) presented good performance with the specific surface area (830 m2/g), bulk density (0.072 g/cm3), contact angle (146°), and the average pore size (10.7 nm).

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Acknowledgments

The authors are grateful for the financial support of the National Natural Science Foundation of China (Grant Nos. 41472035 and 51304080).

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Authors and Affiliations

  1. Key Laboratory of Automobile Materials of Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun, 130025, China

    Yan Cheng, Nan Li & Cundi Wei

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  1. Yan Cheng
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  2. Nan Li
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  3. Cundi Wei
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Correspondence to Cundi Wei.

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Cheng, Y., Li, N. & Wei, C. Effect of the TMCS/hydrogel volume ratio on physical properties of silica aerogels based on fly ash acid sludge. J Sol-Gel Sci Technol 78, 279–284 (2016). https://doi.org/10.1007/s10971-015-3954-3

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  • DOI: https://doi.org/10.1007/s10971-015-3954-3

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