Structure and dynamics of aqueous solutions from PBE-based first-principles molecular dynamics simulations
Abstract
Establishing an accurate and predictive computational framework for the description of complex aqueous solutions is an ongoing challenge for density functional theory based first-principles molecular dynamics (FPMD) simulations. In this context, important advances have been made in recent years, including the development of sophisticated exchange-correlation functionals. On the other hand, simulations based on simple generalized gradient approximation (GGA) functionals remain an active field, particularly in the study of complex aqueous solutions due to a good balance between the accuracy, computational expense, and the applicability to a wide range of systems. In such simulations we often perform them at elevated temperatures to artificially “correct” for GGA inaccuracies in the description of liquid water; however, a detailed understanding of how the choice of temperature affects the structure and dynamics of other components, such as solvated ions, is largely unknown. In order to address this question, we carried out a series of FPMD simulations at temperatures ranging from 300 to 460 K for liquid water and three representative aqueous solutions containing solvated Na+, K+, and Cl- ions. We show that simulations at 390–400 K with the Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional yield water structure and dynamics in good agreement with experiments at ambient conditions.more »
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1368013
- Alternate Identifier(s):
- OSTI ID: 1329080
- Report Number(s):
- LLNL-JRNL-704365
Journal ID: ISSN 0021-9606
- Grant/Contract Number:
- AC52-07NA27344; SC0008938
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 145; Journal Issue: 15; 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, COMPUTING, AND INFORMATION SCIENCE
Citation Formats
Pham, Tuan Anh, Ogitsu, Tadashi, Lau, Edmond Y., and Schwegler, Eric. Structure and dynamics of aqueous solutions from PBE-based first-principles molecular dynamics simulations. United States: N. p., 2016.
Web. doi:10.1063/1.4964865.
Pham, Tuan Anh, Ogitsu, Tadashi, Lau, Edmond Y., & Schwegler, Eric. Structure and dynamics of aqueous solutions from PBE-based first-principles molecular dynamics simulations. United States. https://doi.org/10.1063/1.4964865
Pham, Tuan Anh, Ogitsu, Tadashi, Lau, Edmond Y., and Schwegler, Eric. Mon .
"Structure and dynamics of aqueous solutions from PBE-based first-principles molecular dynamics simulations". United States. https://doi.org/10.1063/1.4964865. https://www.osti.gov/servlets/purl/1368013.
@article{osti_1368013,
title = {Structure and dynamics of aqueous solutions from PBE-based first-principles molecular dynamics simulations},
author = {Pham, Tuan Anh and Ogitsu, Tadashi and Lau, Edmond Y. and Schwegler, Eric},
abstractNote = {Establishing an accurate and predictive computational framework for the description of complex aqueous solutions is an ongoing challenge for density functional theory based first-principles molecular dynamics (FPMD) simulations. In this context, important advances have been made in recent years, including the development of sophisticated exchange-correlation functionals. On the other hand, simulations based on simple generalized gradient approximation (GGA) functionals remain an active field, particularly in the study of complex aqueous solutions due to a good balance between the accuracy, computational expense, and the applicability to a wide range of systems. In such simulations we often perform them at elevated temperatures to artificially “correct” for GGA inaccuracies in the description of liquid water; however, a detailed understanding of how the choice of temperature affects the structure and dynamics of other components, such as solvated ions, is largely unknown. In order to address this question, we carried out a series of FPMD simulations at temperatures ranging from 300 to 460 K for liquid water and three representative aqueous solutions containing solvated Na+, K+, and Cl- ions. We show that simulations at 390–400 K with the Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional yield water structure and dynamics in good agreement with experiments at ambient conditions. Simultaneously, this computational setup provides ion solvation structures and ion effects on water dynamics consistent with experiments. These results suggest that an elevated temperature around 390–400 K with the PBE functional can be used for the description of structural and dynamical properties of liquid water and complex solutions with solvated ions at ambient conditions.},
doi = {10.1063/1.4964865},
journal = {Journal of Chemical Physics},
number = 15,
volume = 145,
place = {United States},
year = {Mon Oct 17 00:00:00 EDT 2016},
month = {Mon Oct 17 00:00:00 EDT 2016}
}
Web of Science
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