Browsing by Author "Briscoe, B. J."

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    Adhesion at the Alkane/Water and Ester/Water Interfaces
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (1), 1972) Aveyard, R.; Briscoe, B. J.; Chapman, J.
    The surface tension of 1-decanol and of several methyl esters of n-alkanoic acids, and the interfacial tension of these materials against water, have been determined in the temperature range 20-32 C. The interfacial tensions of n-nonane and n-undccane against water in the range 20-30 C arc also reported. A simple model is proposed to account for the variation with chain length of the thermo dynamic parameters of adhesion of the liquids with water. The results are consistent with n-alkanes assuming an orientation parallel to the water surface and the esters being essentially normal to the surface.
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    Adsorption of n-Alkanols at Alkane/Water Interfaces
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (3), 1972) Aveyard, R.; Briscoe, B. J.
    The adsorption of a scries of long-chain n-alkanols from various alkanes to alkane/water interfaces has been studied. Some general features of the graphs of surface pressure against solute concentration are presented and, where possible, comparisons arc made wih previous work. Standard free energies of adsorption of the alkanols have been determined ; they vary by a small but significant amount with both alkanol and alkane chain length. The intcrfacial concentrations of the alkanols have been determined by the use of the Gibbs adsorption equation. The usefulness of surface equations of state, based both on a two-dimensional gas model and a two-dimensional solution model tor the interface, has been investigated. The latter model is probably the more physically realistic but the present results have not proved this to be so. It is concluded that the measurements of limiting adsorptions would be useful in this connection.