Abstract
To examine the role of Coulomb forces in the properties of liquids two ensembles of charged and neutral particles have been studied by molecular dynamics calculations. It is shown that the long range forces have a strong structuring effect and lead to high values of the internal energy. The differences between the two systems are very large at low pressure. At high pressure the confinement effect acts as a cohesive force and thus reduces the difference between charged and uncharged ensembles. The presence of Coulomb forces enhances the lifetime of local structures; this is principally apparent for small particles for which the cooperative anion–cation motions become important particularly at low density. This behavior results from the strong attractive forces and can be considered as the very beginning of an association process.
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