Abstract:
We have used a modified surface force apparatus (SFA) to study adsorption onto mica surfaces from near-saturated vapours of n-hexane and n-perfluorohexane, and mixtures thereof. For relative vapour pressures in the range 0.9-0.998 the films adsorbed from vapours of the pure liquids range in thickness from 1 to 4 nm, in crude agreement with the predictions of non-retarded van der Waals-Lifshitz theory. The observed deviations from theory show a qualitative difference between the two liquids, which may reflect differences in the significance of structural contributions to the disjoining pressure. Under the same experimental conditions, adsorption from vapours of (one-phase) liquid mixtures gives rise to films which are significantly thicker, over a broad range of intermediate compositions, than those adsorbed from the pure vapours, with a broad maximum in thickness observed near the critical composition of the bulk liquid mixture.
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Received 30 July 2001
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Kohonen, M., Christenson, H. Adsorption from pure and mixed vapours of n-hexane and n-perfluorohexane. Eur. Phys. J. E 6, 315–323 (2001). https://doi.org/10.1007/s10189-001-8046-4
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DOI: https://doi.org/10.1007/s10189-001-8046-4