Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/8100
Title: Free energy of solvation of simple ions: Molecular-dynamics study of solvation of Cl- and Na+ in the ice/water interface
Contributor(s): Smith, Erica  (author)orcid ; Bryk, Taras (author); Haymet, Anthony D J (author)
Publication Date: 2005
DOI: 10.1063/1.1953578
Handle Link: https://hdl.handle.net/1959.11/8100
Abstract: Molecular-dynamics simulations of Cl- and Na+ ions are performed to calculate ionic solvation free energies in both bulk simple point-charge/extended water and ice 1 h at several different temperatures, and at the basal ice 1 h/water interface. For the interface we calculate the free energy of "transfer" of the ions across the ice/water interface. For the ions in bulk water in the NPT ensemble at 298 K and 1 atm, results are found to be in good agreement with experiments, and with other simulation results. Simulations performed in the NVT ensemble are shown to give equivalent solvation free energies, and this ensemble is used for the interfacial simulations. Solvation free energies of Cl− and Na+ ions in ice at 150 K are found to be ~ 30 and ~ 20 kcal mol⁻¹, respectively, less favorable than for water at room temperature. Near the melting point of the model the solvation of the ions in water is the same (within statistical error) as that measured at room temperature, and in the ice is equivalent and ~ 10 kcal mol⁻¹ less favorable than the liquid. The free energy of transfer for each ion across ice/water interface is calculated and is in good agreement with the bulk observations for the Cl- ion. However, for the model of Na+ the long-range electrostatic contribution to the free energy was more negative in the ice than the liquid, in contrast with the results observed in the bulk calculations.
Publication Type: Journal Article
Source of Publication: The Journal of Chemical Physics, 123(3), p. 1-16
Publisher: AIP Publishing LLC
Place of Publication: United States of America
ISSN: 1089-7690
0021-9606
1520-9032
Fields of Research (FoR) 2008: 030704 Statistical Mechanics in Chemistry
030699 Physical Chemistry not elsewhere classified
030799 Theoretical and Computational Chemistry not elsewhere classified
Socio-Economic Objective (SEO) 2008: 970103 Expanding Knowledge in the Chemical Sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article

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