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Rapid synthesis of silica aerogels by microwave irradiation

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Abstract

Silica aerogels prepared via microwave irradiation using tetraethyl orthosilicate (TEOS) as the precursor are described. The aerogels were obtained after subjecting the entire process under microwave irradiation, significantly reducing the synthesis time to 90 min, which is much shorter than the supercritical CO2 drying (SCD) method and ambient drying (APD) method. The obtained aerogels under microwave irradiation condition with different power and time exhibit surface areas of 831 m2 g−1, average pore sizes of 8.67–12.7 nm, and contact angles of 146.5°. The aerogels are thermally stable and the thermal conductivity is relatively low at 0.028 W m−1 K−1, when the molar ratio of E value (EtOH /TEOS) is 8. The results demonstrate the efficiency of synthesizing silica aerogels via microwave irradiation in the industry.

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Acknowledgements

The present work was financially supported by the Equipment Advanced Research Field Foundation of China (Grant No. 61409220210 and No. 61409220204), supported by the National Natural Science Foundation of China (Grant No. 51772151), and supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Jiang Jun Road 29, Nanjing, 211106, People’s Republic of China

    Xinyang Zhang, Zhaofeng Chen, Junxiong Zhang & Qianhua Yu

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 211800, People’s Republic of China

    Sheng Cui

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  1. Xinyang Zhang
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  2. Zhaofeng Chen
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  3. Junxiong Zhang
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  4. Qianhua Yu
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The first author, Xinyang Zhang, wrote the manuscript; all the other authors contributed and reviewed it. We thank Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

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Correspondence to Zhaofeng Chen.

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Zhang, X., Chen, Z., Zhang, J. et al. Rapid synthesis of silica aerogels by microwave irradiation. J Porous Mater 28, 1469–1479 (2021). https://doi.org/10.1007/s10934-021-01085-1

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