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Designing Double Pore Structure in Alkoxy-Derived Silica Incorporated with Nonionic Surfactant

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Abstract

The principle of designing double-pore structure in alkoxy-derived silica is described with the experimental system containing polyoxyethylene nonylphenylether. The formation of macropores is consistently explained in terms of the concurrence of a phase separation and a sol-gel transition in the polymerizing silica-surfactant-solvent system. The composition-morphology relationship exhibited a substantial variation depending on the length of oxyethylene units in the surfactant molecule. The mesopore volume obtained after basic solvent exchange and a heat-treatment suggested that the surfactant with shorter oxyethylene chain tends to be incorporated more in the gel phase to give higher mesopore volume. The small-angle X-ray scattering measurement of the gelling and aging system supported this hypothesis indicating micelle formation in the system containing a surfactant with shorter oxyethylene chain.

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Authors and Affiliations

  1. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 60601, Japan

    Kazuki Nakanishi, Tomohiro Nagakane & Naohiro Soga

Authors
  1. Kazuki Nakanishi
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  2. Tomohiro Nagakane
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  3. Naohiro Soga
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Nakanishi, K., Nagakane, T. & Soga, N. Designing Double Pore Structure in Alkoxy-Derived Silica Incorporated with Nonionic Surfactant. Journal of Porous Materials 5, 103–110 (1998). https://doi.org/10.1023/A:1009633102016

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  • DOI: https://doi.org/10.1023/A:1009633102016

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