Some Characteristics in Particle Growth in Gel and Oscillatory Zoning

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An experiment for the particle growth in gelatin was performed. Particle is a solid solution of (Ba,Sr)SO<SUB>4</SUB>. First of all, we performed a counter-diffusion type experiment where BaCl<SUB>2</SUB> and SrCl<SUB>2</SUB> diffuse in gelatin and Na<SUB>2</SUB>SO<SUB>4</SUB> diffuses toward the opposite direction. This is a condition proposed by Putnis <I>et al.</I> (1992). Oscillatory zoning found out by Putnis <I>et al.</I> (1992) was reproduced. Then, chemical composition changed periodically in a particle, thickness of each circular stripe being several microns in the order of magnitude. In order to investigate the particle growth process in a gel, we performed experiments for particle growth with several kinds of processes with reactions and diffusions. In these experiments, some kinds of chemical species were dissolved in gelatin, and other chemical species were diffused in gelatin. Findings of this work indicated that core portions of particles of the reaction-diffusion process were mainly composed of BaSO<SUB>4</SUB> which determines fundamental shape of particles. After formation of this core, hemi-cylindrical portions with Sr-rich composition were deposited on the surface of the core. Although the characteristics were always kept for all of the experimental conditions of this work, the rate of deposition of hemi-cylindrical portion was dependent on the way of diffusion which was controlled by an experimental setup and gelation time. Fundamental information for particle growth in gel was obtained in this work, and potential activity for particle formation with reaction-diffusion mechanism was pointed out.

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  • Journal of chemical engineering of Japan

    Journal of chemical engineering of Japan 37(5), 650-656, 2004-05-01

    The Society of Chemical Engineers, Japan

参考文献:  16件中 1-16件 を表示

被引用文献:  3件中 1-3件 を表示

各種コード

  • NII論文ID(NAID)
    10013340526
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    6944406
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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