Previous aging as a parameter for a liquid phase synthesis of ceramic nanoparticles

Naoya Enomoto, Akihiro Kumagai, Junichi Hojo

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)


    Particular attention has been paid to the "age" of the starting solution for a liquid phase synthesis of ceramic nanoparticles. That is, starting solutions were prepared and kept in a container for several days and then were used to make a precipitation. Metal oxalates (hydrate) were precipitated from ethanolic solutions of oxalic acid and metal nitrate (hydrate). Aging of the starting solutions resulted in a marked delay of the precipitation. Silica spheres were prepared from ethanolic solutions of tetraethylorthosilicate (TEOS) and ammonia water. Aging of the starting solutions enhanced the size and monodispersibility of the spheres. We infer that the delay in precipitation is due to microscopic homogenization in the solution structure among ethanol, water, and solute species. That is, even when the prepared starting solutions look clear, transparent, and homogeneous, they may involve less-dispersed aggregates of solute/solvent, which would enhance heterogeneous nucleation to reduce the delay.

    Original languageEnglish
    Pages (from-to)391-394
    Number of pages4
    JournalJournal of Ceramic Processing Research
    Issue number4
    Publication statusPublished - 2004

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites


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