シリカ/無機塩系固体状態における分散安定性と成分組成の影響 : シリカ /無機塩系およびチタニア/無機塩系における凝集・分相過程(第2報) Influence of Dispersibility and Component Ratio in the Silica/Inorganic Salt Solid Mixture : Cogagulation/Phase Separation Process in the Silica/Inorganic Salt and the Titania/Inorganic Salt Systems (2nd Report)

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著者

    • 今泉 公夫 IMAIZUMI Kimio
    • 芝浦工業大学地域環境システム専攻 Department of Materials Science and Engineering, Shibaura Institute of Technology
    • 松田 成広 MATSUDA Narihiro
    • 芝浦工業大学修士課程材料工学専攻 Department of Materials Science and Engineering, Shibaura Institute of Technology

抄録

By using a solid mixture of silica (SiO<sub>2</sub>) with water-soluble inorganic salts as pore constructing agents, porous materials were fabricated through the coagulation / phase separation process. During the formation of the porous structure in the SiO<sub>2</sub> / inorganic salt system, dispersibility of the mixture of silica sol with inorganic salt and the SiO<sub>2</sub> / inorganic salt ratio are considered to strongly influence the coagulation/phase separation. In this study, we elucidated the dispersibility during the mixing of silica sol with inorganic salt, and the influence of the SiO<sub>2</sub> / inorganic salt ratio in the solid mixture on the coagulation / phase separation. When SiO<sub>2</sub> sol is mixed with inorganic salt in the solution, the surface electric potential is varied depending on the pH of the solution. Hence, dispersibility affected by the pH of the mixture is considered to strongly influence the resulting coagulation / phase separation in the SiO<sub>2</sub> / inorganic salt system. In this system, the SiO<sub>2</sub> / inorganic salt solution mixture had good dispersibility under the acidic condition of pH less than 4. On the other hand, gelation abruptly occurred after mixing SiO<sub>2</sub> sol with inorganic salt under the conditon of pH nearly 7. Furthermore, the SiO<sub>2</sub> / inorganic salt solution mixture had poor dispersibility under the acidic condition of pH less than 4, and the resulting porous material was found to have broad pore size distribution. To clarify the influence of the SiO<sub>2</sub> / inorganic salt ratio on the coagulation/phase separation, solid mixtures having various ratios of SiO<sub>2</sub> / inorganic were prepared. SiO<sub>2</sub> / inorganic salt (KBr) with the volume fraction ratios widely ranging from 10 / 90 to 90 / 10 could form the monodispersed pore structure. Remarkably, the thickness of the framework in the porous material increased with the increase of the SiO<sub>2</sub> volume fraction. Namely, the thickness of the framework as well as the pore size or the pore size distribution was influenced by SiO<sub>2</sub> / inorganic salt ratios.

収録刊行物

  • 資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan

    資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan 118(3), 202-205, 2002-04-25

    The Mining and Materials Processing Institute of Japan

参考文献:  34件中 1-34件 を表示

各種コード

  • NII論文ID(NAID)
    10008226345
  • NII書誌ID(NCID)
    AN10062646
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09161740
  • NDL 記事登録ID
    6151722
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-315
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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