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Effect of the thermal treatment on microstructure and physical properties of low-density and high transparency silica aerogels via acetonitrile supercritical drying

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Abstract

In this paper, we reported the experimental results about the effect of the thermal treatment on microstructure and physical properties of low-density and high transparent silica aerogels. From our results, with tetramethyl orthosilicate as precursor and via acetonitrile supercritical drying process, silica aerogel monolith was obtained possessing the properties as low-density (0.018 g/cm3), high surface area (923 m2/g), high optical transparency (87.9 %, 800 nm). It should be noted that high transparency of silica aerogel can be maintained up to 600 °C (91.5 %, 800 nm). The mechanical properties of silica aerogel decreased with increasing heat treated temperature to 600 °C, and silica aerogels still maintained crack-free monoliths completely and possessed high homogeneous density even after 600 °C thermal treatment. Furthermore, thermal conductivity of the monoliths at desired temperatures was analyzed by the transient plane heat source method. When the temperature flowed from 25 to 600 °C, thermal conductivity coefficients of silica aerogels changed from 0.021 to 0.065 W (m K)−1, revealed an excellent heat insulation effect in high-temperature area. Currently, the specific process developed for low-density aerogels affected by thermal treatment has not been reported in previous literature.

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Acknowledgments

This research is financially supported by National Natural Science Foundation of China (Grant Nos. 51272179, 51072137,50802064, 51102183), the National Science Foundation for Postdoctoral Scientists of China (Grant No. 20100480619), Shang hai Committee of Science and Technology (10JC1414800) and Key Projects in the National Science & Technology Pillar Program (2009BAC62B02), Specialized Research Fund for the Doctoral Program of Higher Education.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Institute of Physical Science and Engineering of Tongji University, Shanghai, 200092, People’s Republic of China

    Guangwu Liu, Bin Zhou, Ai Du, Jun Shen & Qiujie Yu

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  1. Guangwu Liu
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  2. Bin Zhou
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  3. Ai Du
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  4. Jun Shen
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  5. Qiujie Yu
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Correspondence to Bin Zhou.

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Liu, G., Zhou, B., Du, A. et al. Effect of the thermal treatment on microstructure and physical properties of low-density and high transparency silica aerogels via acetonitrile supercritical drying. J Porous Mater 20, 1163–1170 (2013). https://doi.org/10.1007/s10934-013-9699-x

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