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Title: First-Principles Molecular Dynamics Study of a Deep Eutectic Solvent: Choline Chloride/Urea and Its Mixture with Water

Journal Article · · Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry
 [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [3];  [3]; ORCiD logo [4]
  1. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Chemistry and Chemical Theory Center
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
  3. Khalifa Univ. of Science and Technology, Abu Dhabi (United Arab Emirates). Petroleum Inst., Dept. of Chemical Engineering
  4. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Chemistry and Chemical Theory Center; Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Chemical Engineering and Materials Science

First-principles molecular dynamics simulations in the canonical ensemble at temperatures of 333 and 363 K and at the corresponding experimental densities are carried out to investigate the behavior of the 1:2 choline chloride/urea (reline) deep eutectic solvent and its equimolar mixture with water. Analysis of atom–atom radial and spatial distribution functions and of the H-bond network reveals the microheterogeneous structure of these complex liquid mixtures. In neat reline, the structure is governed by strong H-bonds of the trans- and cis-H atoms of urea to the chloride ion. In hydrous reline, water competes for the anions, and the H atoms of urea have similar propensities to bond to the chloride ions and the O atoms of urea and water. Finally, the vibrational spectra exhibit relatively broad peaks reflecting the heterogeneity of the environment. Although the 100 ps trajectories allow only for a qualitative assessment of transport properties, the simulations indicate that water is more mobile than the other species and its addition also fosters faster motion of urea.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
AC52-07NA27344; CHE-1265849
OSTI ID:
1455411
Report Number(s):
LLNL-JRNL-739501; 893168; TRN: US1901235
Journal Information:
Journal of Physical Chemistry. B, Condensed Matter, Materials, Surfaces, Interfaces and Biophysical Chemistry, Vol. 122, Issue 3; ISSN 1520-6106
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 118 works
Citation information provided by
Web of Science

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A Natural Deep Eutectic Solvent Formulated to Stabilize β-Lactam Antibiotics journal October 2018
The peculiar effect of water on ionic liquids and deep eutectic solvents journal January 2018
Natural deep eutectic solvents in the hetero-Diels–Alder approach to bis(indolyl)methanes journal June 2019
What a difference a methyl group makes – probing choline–urea molecular interactions through urea structure modification journal January 2019
Strong Microheterogeneity in Novel Deep Eutectic Solvents journal June 2019
Janus-faced role of water in defining nanostructure of choline chloride/glycerol deep eutectic solvent journal January 2018
Water distribution at the electrified interface of deep eutectic solvents journal January 2019
Structural, Thermodynamic, and Transport Properties of Aqueous Reline and Ethaline Solutions from Molecular Dynamics Simulations journal October 2019
Enhanced Enzymatic Hydrolysis and Lignin Extraction of Wheat Straw by Triethylbenzyl Ammonium Chloride/Lactic Acid-Based Deep Eutectic Solvent Pretreatment journal November 2019