Effect of soft sonication on starting solution for spherical silica synthesis

Naoya Enomoto, Akihiro Kumagai, Junichi Hojo

    研究成果: ジャーナルへの寄稿学術誌査読

    6 被引用数 (Scopus)

    抄録

    Monodispersed spheres of silica were prepared with particular attention to the age of starting solutions, and a subtle irradiation (∼mW power) of ultrasonic vibration, which we termed soft sonication, was applied to enhance the aging process. Aging effects on the precipitation behavior are as follows, (1) increase of the incubation period for precipitation, (2) increase of the final particle size, (3) improvement of the monodispersibility. The increment of the final particle size as a function of aging time is twice larger in the case of soft sonication than in the case of normal aging. We assume from these results that a starting solution, especially that including an organic solvent with a low dielectric constant, may be inhomogeneous at the microscopic level just after the preparation. In other words, the as-prepared solution may involve some clusters, which may cause unfavorable nucleation to degrade the monodispersibility. It is inferred that these "clusters" can be broken or dispersed by aging for days or weeks. Reduction of the aging period by soft sonication would be due to high frequency (∼tens of kHz) and small amplitude (∼nm) of the vibration.

    本文言語英語
    ページ(範囲)286-289
    ページ数4
    ジャーナルJournal of Ceramic Processing Research
    6
    4
    出版ステータス出版済み - 2005

    !!!All Science Journal Classification (ASJC) codes

    • セラミックおよび複合材料

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