Condensed Matter Physics, 1996, No. 7, p. 89-100, English
A new reference model for ionic-aqueous solution is proposed. We consider a three component hard sphere mixture. One of the species corresponds to water molecules and includes four short-range attractive sites, simulating the creation of hydrogen bonds in water. Other components correspond to cations and anions and contain one attractive site, which supposes dimerization between them. The special kind of association between ions and molecules is used for the description of solvation effects. We suppose, that each site of water molecules can be only singly bound with ions and each ion can be bonded with many water sites. The possible number of solvation bonds, that can be established with the same ions is restricted only by the relationships between the species diameter. The expression for the unbonded site concentrations, free energy, and pressure have been obtained. The phase transition of gas - H-bonds network type, which arises in the model under consideration for pure water, disappears with increasing of ion fraction.Comments: Refs. 11, Figs. 6, Tabs. 0.
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