Author： Cracknell Roger Nicholson David Parsonage Neville
Publisher： Taylor & Francis Ltd
ISSN： 1362-3028
Source： Molecular Physics, Vol.75, Iss.5, 1992-04, pp. : 1039-1045
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Abstract
A first-order statistical mechanical model is developed for the ‘hydration force' repulsion between adjacent bilayers, such as those occurring in the lamellar (L ) phase of polyethylene nonionic surfactant-water mixtures. The theory emphasizes the entropy of water bound to surfactant head groups. We examine the consequences of adopting this simplified model as the sole explanation of the observed pressure versus separation behaviour. It is shown that the inclusion of entropy alone leads to reasonable predictions. Extension of the model to include a mean field enthalpy change term brings the parameters into better agreement with experimental expectations and, at the same time, strongly suggests that the behaviour of such systems is dominated by entropy. We conclude that a model of this type, although it provides an adequate explanation of experimental observations, is incomplete without further elaboration.
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