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Low-density, transparent aerogels and xerogels based on hexylene-bridged polysilsesquioxane with bendability

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

Low-density, transparent aerogels based on a hexylene-bridged polysilsesquioxane ([O1.5Si–(CH2)6–SiO1.5] n ) network have been prepared for the first time via a simple sol–gel process. An optimized base-catalyzed one-step hydrolysis–polycondensation process of a bridged alkoxysilane precursor 1,6-bis(trimethoxysilyl)hexane in a low-polarity solvent N,N-dimethylformamide allows for the formation of a pore structure of a length scale of several tens nanometers, resulting in low-density, transparent aerogels after supercritical drying. Because of the incorporated organic moiety that bridges the silicon atoms in the network, these aerogels show higher flexibility and strength against compression and bending as compared to silica aerogel counterparts. In addition, minimizing the residual silanol groups in the network by a surface modification with hexamethyldisilazane has further improved resilience after compression and bending flexibility and strength, due to the decreased chance of the irreversible formation of the siloxane bonds upon compression. The resulting trimethylsilylated hydrophobic gels have been subjected to ambient pressure drying to obtain xerogels, resulting in low-density (0.13 g cm−3, 90 % porosity), transparent (71 % transmittance) xerogels. These results are promising for the development of transparent thermal superinsulators applicable to window insulating systems that manage heat transfer in a more efficient way.

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Acknowledgments

The present study has been performed under financial supports from Grant-in-Aid for Scientific Research (No. 24550253 JSPS and MEXT Japan) and Advanced Low Carbon Technology Research and Development Program (ALCA, JST Japan).

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Authors and Affiliations

  1. Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan

    Yosuke Aoki, Taiyo Shimizu, Kazuyoshi Kanamori & Kazuki Nakanishi

  2. Division of Environmental Chemistry, Institute for Chemical Research, Kyoto University, Gokasho, Uji, 611-0011, Japan

    Ayaka Maeno & Hironori Kaji

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  1. Yosuke Aoki
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  2. Taiyo Shimizu
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  3. Kazuyoshi Kanamori
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  6. Kazuki Nakanishi
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Correspondence to Kazuyoshi Kanamori.

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Aoki, Y., Shimizu, T., Kanamori, K. et al. Low-density, transparent aerogels and xerogels based on hexylene-bridged polysilsesquioxane with bendability. J Sol-Gel Sci Technol 81, 42–51 (2017). https://doi.org/10.1007/s10971-016-4077-1

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  • DOI: https://doi.org/10.1007/s10971-016-4077-1

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