Effect of soft sonication on starting solution for spherical silica synthesis

Naoya Enomoto, Akihiro Kumagai, Junichi Hojo

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)286-289
    Number of pages4
    JournalJournal of Ceramic Processing Research
    Volume6
    Issue number4
    Publication statusPublished - 2005

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites

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