Journal
THEORETICAL CHEMISTRY ACCOUNTS
Volume 140, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1007/s00214-021-02825-x
Keywords
Dielectric constant; Water structure; Dipole moment average; Polarizable water
Categories
Funding
- Brazilian Federal Agency for Support and Evaluation of Graduate Education (CAPES/Print/UFF) [88881.310460/2018-01]
- CNPq
- CAPES
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This study investigated the thermodynamic, dynamic, and dielectric properties of water mixtures with ionic liquids using molecular dynamics simulations. The results revealed a phase separation previously reported by experimental data and provided insights into why the ionic liquid behaves hydrophobic.
In this work, we present the dielectric behavior of water with a novel flexible model, FAB/epsilon, that improved three-site water models. Different concentrations of the ionic liquid 1-butyl-3-methylimidazolium [bmim] and bis(trifluoromethanesulfonyl) imide [Tf2N] with water have been investigated. The study was performed by molecular dynamics simulations using three water models, being two non-polarizable 3-site SPC/E and SPC/e and a flexible 3-site FAB/epsilon model. Systematic thermodynamics and dynamical and dielectric properties were investigated, such as density, self-diffusion coefficient, heat of vaporization Delta H-vap, and surface tension at 300 K and 1 bar. Extrapolating the experimental molar fraction of the mixtures, a pattern change for all properties was observed, evidencing the phase separation previously reported by experimental data. The results also show the dielectric effect in the system, which is important in ionic systems and fundamental for understanding why this ionic liquid behaves hydrophobic.
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