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Research of silica aerogels prepared by acidic silica sol under the condition of atmospheric pressure drying

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Abstract

Acidic silica sol was used as precursor to prepare SiO2 aerogels using the atmospheric pressure drying technology. The influence of pH, water bath temperature and concentrations of silica sol on the structure parameters and morphology were systematically studied. SiO2 aerogel prepared with the sol concentration of 20% possessed uniform structure and the best structure parameters. Water bath temperature exhibited an obvious effect on morphology, specific surface area and porosity. Moreover, the optimal SiO2 aerogel showed a good heat resistance up to 700 °C. A lower thermal conductivity was 0.019 W/m · K at room temperature (25 °C) and 0.044 W/m · K at 600 °C.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of Shandong province, China (ZR2015EL005 and ZR2016BQ26) and the NSFC (No. 21601063). Authors also appreciated Fazhe Sun for the analysis of scanning electron microscopy in the Analytical and Testing Center of Shandong University of Technology.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, China

    Da Sun, Kui Li & Futian Liu

  2. Shandong Research and Design Institute Ceramics Co., Ltd, Zibo, 255031, China

    Xueye Sui & Changling Zhou

Authors
  1. Da Sun
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  2. Kui Li
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  3. Xueye Sui
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  4. Changling Zhou
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  5. Futian Liu
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Correspondence to Futian Liu.

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Sun, D., Li, K., Sui, X. et al. Research of silica aerogels prepared by acidic silica sol under the condition of atmospheric pressure drying. J Porous Mater 25, 341–349 (2018). https://doi.org/10.1007/s10934-017-0445-7

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  • DOI: https://doi.org/10.1007/s10934-017-0445-7

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