Browsing by Author "Sheridan, Margaret H."

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    Adsorption of Xenon on Films of Gold, Aluminium and Silver
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (6), 1972) Bruce, Linda A.; Sheridan, Margaret H.
    A comparative study of the adsorption of xenon on films of gold, aluminium and silver prepared in an ultra-high vacuum system is reported. Sets of isotherms in the temperature range 77-90 K have been measured for two different surface preparations of each metal. The Dubinin-Radush- kevich equation is inappropriate except at very low coverage. Isosteric heats and differential entropies of adsorption arc plotted as a function of coverage for each film. Equilibrium heats molar entropies and energies of adsorption are evaluated. Calculation of the heat of adsorption from the theoretical expression of Mavroyannis yields values considerably lower than those obtained by experiment.
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    Deficiency in the Analysis of Physical Adsorption Data
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1973, 69 (1), 1973) Bruce, Linda A.; Sheridan, Margaret H.
    The criterion of fit to adsorption data advocated by Baker and Head is shown to be too lax and likely to lead to spurious analysis. Computer-generated parameters fitting the derived heats and entropies of adsorption yield isotherms in disagreement with the experimental isotherms from which these derived quantities were evaluated. Reasons for this discrepancy are considered, and an improved criterion of fit is suggested. Impediments to establishing a unique description of a surface by this type of analysis are examined.