Effects of ion concentration on the hydrogen bonded structure of water in the vicinity of ions in aqueous NaCl solutions |
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| Authors: | A Nag D Chakraborty and A Chandra |
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| Institution: | (1) Department of Chemistry, Indian Institute of Technology, Kanpur, 208 016, India;(2) Present address: Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA |
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| Abstract: | Molecular dynamics simulations of dilute and concentrated aqueous NaCl solutions are carried out to investigate the changes
of the hydrogen bonded structures in the vicinity of ions for different ion concentrations. An analysis of the hydrogen bond
population in the first and second solvation shells of the ions and in the bulk water is done. Although essentially no effect
of ions on the hydrogen bonding is observed beyond the first solvation shell of the ions for the dilute solutions, for the
concentrated solutions a noticeable change in the average number of water-water hydrogen bonds is observed in the second solvation
shells of the ions and even beyond. However, the changes in the average number of hydrogen bonds are found to be relatively
less when both water-water and ion-water hydrogen bonds are counted. Thus, the changes in the total number of hydrogen bonds
per water are not very dramatic beyond the first solvation shell even for concentrated solutions. |
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| Keywords: | Aqueous ionic solutions hydrogen bonds solvation shells molecular dynamics |
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