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Title: Electrostatic solvation free energies of charged hard spheres using molecular dynamics with density functional theory interactions

Abstract

Determining the solvation free energies of single ions in water is one of the most fundamental problems in physical chemistry and yet many unresolved questions remain. In particular, the ability to decompose the solvation free energy into simple and intuitive contributions will have important implications for models of electrolyte solution. In this paper, we provide definitions of the various types of single ion solvation free energies based on different simulation protocols. We calculate solvation free energies of charged hard spheres using density functional theory interaction potentials with molecular dynamics simulation and isolate the effects of charge and cavitation, comparing to the Born (linear response) model. We show that using uncorrected Ewald summation leads to unphysical values for the single ion solvation free energy and that charging free energies for cations are approximately linear as a function of charge but that there is a small non-linearity for small anions. The charge hydration asymmetry for hard spheres, determined with quantum mechanics, is much larger than for the analogous real ions. Finally, this suggests that real ions, particularly anions, are significantly more complex than simple charged hard spheres, a commonly employed representation.

Authors:
ORCiD logo [1];  [1];  [1];  [2]
+ Show Author Affiliations
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical Science Division
  2. Univ. of Washington, Seattle, WA (United States). Dept. of Chemical Engineering
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); PNNL Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1430713
Alternate Identifier(s):
OSTI ID: 1372714
Report Number(s):
PNNL-SA-123710
Journal ID: ISSN 0021-9606; TRN: US1802921
Grant/Contract Number:  
AC05-76RL01830; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 147; Journal Issue: 16; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 97 MATHEMATICS AND COMPUTING; electrochemistry; condensed matter properties; crystallography; liquids; statistical mechanics models; thermodynamic properties; crystal structure; computational methods; density functional theory; computer simulation

Citation Formats

Duignan, Timothy T., Baer, Marcel D., Schenter, Gregory K., and Mundy, Chistopher J. Electrostatic solvation free energies of charged hard spheres using molecular dynamics with density functional theory interactions. United States: N. p., 2017. Web. doi:10.1063/1.4994912.
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Duignan, Timothy T., Baer, Marcel D., Schenter, Gregory K., & Mundy, Chistopher J. Electrostatic solvation free energies of charged hard spheres using molecular dynamics with density functional theory interactions. United States. https://doi.org/10.1063/1.4994912
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Duignan, Timothy T., Baer, Marcel D., Schenter, Gregory K., and Mundy, Chistopher J. Wed . "Electrostatic solvation free energies of charged hard spheres using molecular dynamics with density functional theory interactions". United States. https://doi.org/10.1063/1.4994912. https://www.osti.gov/servlets/purl/1430713.
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@article{osti_1430713,
title = {Electrostatic solvation free energies of charged hard spheres using molecular dynamics with density functional theory interactions},
author = {Duignan, Timothy T. and Baer, Marcel D. and Schenter, Gregory K. and Mundy, Chistopher J.},
abstractNote = {Determining the solvation free energies of single ions in water is one of the most fundamental problems in physical chemistry and yet many unresolved questions remain. In particular, the ability to decompose the solvation free energy into simple and intuitive contributions will have important implications for models of electrolyte solution. In this paper, we provide definitions of the various types of single ion solvation free energies based on different simulation protocols. We calculate solvation free energies of charged hard spheres using density functional theory interaction potentials with molecular dynamics simulation and isolate the effects of charge and cavitation, comparing to the Born (linear response) model. We show that using uncorrected Ewald summation leads to unphysical values for the single ion solvation free energy and that charging free energies for cations are approximately linear as a function of charge but that there is a small non-linearity for small anions. The charge hydration asymmetry for hard spheres, determined with quantum mechanics, is much larger than for the analogous real ions. Finally, this suggests that real ions, particularly anions, are significantly more complex than simple charged hard spheres, a commonly employed representation.},
doi = {10.1063/1.4994912},
journal = {Journal of Chemical Physics},
number = 16,
volume = 147,
place = {United States},
year = {Wed Jul 26 00:00:00 EDT 2017},
month = {Wed Jul 26 00:00:00 EDT 2017}
}
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https://doi.org/10.1063/1.4994912
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    Ion hydration free energies and water surface potential in water nano drops: The cluster pair approximation and the proton hydration Gibbs free energy in solution
    journal, November 2019

    • Houriez, Céline; Réal, Florent; Vallet, Valérie
    • The Journal of Chemical Physics, Vol. 151, Issue 17
    • DOI: 10.1063/1.5109777

    Electromechanics of the liquid water vapour interface.
    text, January 2020

    • Zhang, Chao; Sprik, Michiel
    • Apollo - University of Cambridge Repository
    • DOI: 10.17863/cam.48749

    Quantifying the hydration structure of sodium and potassium ions: taking additional steps on Jacob's Ladder
    text, January 2020

    • Duignan, Timothy T.; Schenter, Gregory K.; Fulton, John L.
    • Universität Regensburg
    • DOI: 10.5283/epub.45957

    Electromechanics of the liquid water vapour interface
    text, January 2019

    Quantifying the hydration structure of sodium and potassium ions: taking additional steps on Jacob's Ladder
    text, January 2020

    • Duignan, Timothy T.; Schenter, Gregory K.; Fulton, John L.
    • Universität Regensburg
    • DOI: 10.5283/epub.45957
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