THE EFFECT OF BULK CONCENTRATION ON SURFACTANT ADSORPTION PROCESSES : THE SHIFT FROM DIFFUSION-CONTROL TO MIXED KINETIC-DIFFUSION CONTROL WITH BULK CONCENTRATION

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著者

    • LIN Shi-yow
    • Department of Chemical Engineering, National Taiwan Institute of Technology
    • CHANG Hong-chi
    • Department of Chemical Engineering, National Taiwan Institute of Technology
    • CHEN En-ming
    • Department of Chemical Engineering, National Taiwan Institute of Technology

抄録

The surface tension relaxation at interfaces between surfactant solutions and immiscible fluids is calculated by the rate that surfactant adsorbs in a two-step process: surfactant in the sublayer adsorbs, which, in turn, establishes a diffusive flux from the bulk. Therefore, both the adsorption and diffusion rates determine the behavior. These rates are commonly determined by minimizing the difference between experimental surface tension vs. time profiles and mass transfer model predictions. Usually, only a limited range of bulk concentrations <I>C<SUB>o</SUB></I> is studied, and the profiles are found to be in agreement with a diffusion-control model. It is argued here that such apparent agreement is insufficient evidence to disregard the role of the adsorption/desorption kinetics in the adsorption process. In this paper, the concept of a shift in controlling mechanism from diffusion control at dilute concentration to mixed diffusion-kinetic control at more elevated bulk concentration is explored. This idea is illustrated theoretically for clean interface adsorption on a pendant bubble or drop using the Langmuir adsorption model in dimensionless form. It is further developed using the model constants for C<SUB>12</SUB>E<SUB>8</SUB>.

収録刊行物

  • Journal of chemical engineering of Japan

    Journal of chemical engineering of Japan 29(4), 634-641, 1996-08-30

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10003814965
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • データ提供元
    CJP書誌  J-STAGE 
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