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Langmuir adsorption, the Gibbs adsorption isotherm, and interfacial kinetics in liquid metal systems

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Abstract

The adsorption of strongly surface active solutes is considered in terms of the ideal site-fillage or Langmuir isotherm. The resulting equation for the depression of surface tension of a liquid metal by such a solute isσ P- σ = RTΓ oi ln (1 +Ka i where σP - σ is the depression of surface tension of the pure liquid metal, Γ oi is the satura-tion coverage by the solute, ai is the bulk activity of the solute, andK is a coverage inde-pendent adsorption coefficient. The isotherm is found to give a very good description of the available data for Group VI solutes on several metals. The derived values of the adsorp-tion coefficient are applied to several kinetic studies and they are found to give good rela-tive and possibly absolute measures of the interference by such solutes on interfacial re-action rates. The iron-sulfur system appears to differ, but only by a factor of two. The application of these adsorption coefficients in aiding the interpretation of kinetic studies is considered.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, University of Pennsylvania, 19174, Philadelphia, PA

    G. R. Belton (Professor)

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  1. G. R. Belton
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Belton, G.R. Langmuir adsorption, the Gibbs adsorption isotherm, and interfacial kinetics in liquid metal systems. Metall Trans B 7, 35–42 (1976). https://doi.org/10.1007/BF02652817

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