Rheological Characterization of Suspension and Gel Prepared from Colloidal Silica for Sealed Lead-Acid Batteries by Small Amplitude Dynamic Oscillation Measurement

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著者

    • Park Jin PARK Jin
    • Department of Chemical and Biomolecular Engineering, and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology
    • Park Seung Bin PARK Seung Bin
    • Department of Chemical and Biomolecular Engineering, and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology
    • Yang Seung-Man [他] YANG Seung-Man
    • Department of Chemical and Biomolecular Engineering, and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology
    • HONG Won Hi
    • Department of Chemical and Biomolecular Engineering, and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology

抄録

Gelation behaviors of silica suspensions, prepared from 6 grades of commercial colloidal silica (Ludox<SUP>®</SUP> series) and sulfuric acid, were investigated rheologically by a small amplitude dynamic oscillation measurement method in which storage and loss moduli were monitored with time. To date, the gel strength of silica suspension/gel in sulfuric acid and its progress with time have not been properly defined, because of their complex rheological behavior such as their weak structure. For the purpose of a quantitative investigation, the time evolution of the storage modulus was measured for the representation of gel strength and its progress related to fluidity decline with time for application to battery manufacture.<BR>A suspension prepared from small-sized silica particles showed high gel strength and accelerated gelation. It was demonstrated that the total surface area in a unit volume of suspension determines the gelation behavior, regardless of particle size in different grades of silica. This implies that high gel strength can be achieved with low content of silica of small particle size.<BR>It was also found that deionized colloidal silica enhances gel strength. This means that sodium ions in the Ludox<SUP>®</SUP>, which play a stabilizing role, should be removed in order to form a strong gel. A positively charged surface and chloride stabilizing ions are not suitable for gelled electrolyte, since they accelerate gelation but do not enhance gel strength.<BR>In conclusion, colloidal silica particles of small size and negative surface charge without stabilizing ions should be used for achieving high gel strength in application to batteries.

収録刊行物

  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 41(4), 238-245, 2008-04-01 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10021109970
  • 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
    9462787
  • 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  NDL  J-STAGE 
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