Abstract
Computer simulation has been employed to study the effect of a confined space of a planar model pore with structureless hydrophobic walls on the hydration of Na+Cl– ion pairs in water vapor at room temperature. A detailed many-body model of intermolecular interactions has been used. The model has been calibrated relative to experimental data on the free energy and enthalpy of the initial reactions of water molecule attachment to ions and the results of quantum-chemical calculations of the geometry and energy of Na+Cl– (H2O) N clusters in stable configurations, as well as spectroscopic data on Na+Cl– dimer vibration frequencies. The free energy and work of hydration, as well as the adsorption curve, have been calculated from the first principles by the bicanonical statistical ensemble method. The dependence of hydration shell size on interionic distance has been calculated by the method of compensation potential. The transition between the states of a contact (CIP) and a solvent-separated ion pair (SSIP) has been reproduced under the conditions of a nanopore. The influence of the pore increases with the hydration shell size and leads to the stabilization of the SSIP states, which are only conditionally stable in bulk water vapor.
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Original Russian Text © S.V. Shevkunov, 2016, published in Kolloidnyi Zhurnal, 2016, Vol. 78, No. 4, pp. 509–519.
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Shevkunov, S.V. Water vapor nucleation on ion pairs under the conditions of a planar nanopore. Colloid J 78, 542–552 (2016). https://doi.org/10.1134/S1061933X16040177
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DOI: https://doi.org/10.1134/S1061933X16040177