Abstract
Structural changes which take place in bulk water when a molecule of an apolar solute is brought therein are studied at a very basic elementary level. Water is modelled by two different types of extended primitive models and the solute is a hard sphere. The model mixture, which does not incorporate any water—solute interaction but the hard-core repulsion and is free of any adjustable parameter, is shown to predict the site—site correlation functions and details of the orientational arrangement of water molecules in the first hydration shell in full agreement with results obtained using complex realistic potentials.
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