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Title: Differential Microscopic Mobility of Components within a Deep Eutectic Solvent

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [1];  [2]
  1. Univ. of Missouri, Columbia, MO (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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From macroscopic measurements of deep eutectic solvents such as glyceline (1:2 molar ratio of choline chloride to glycerol), the long-range translational diffusion of the larger cation (choline) is known to be slower compared to that of the smaller hydrogen bond donor (glycerol). However, when the diffusion dynamics are analyzed on the subnanometer length scale, we discover that the displacements associated with the localized diffusive motions are actually larger for choline. This counterintuitive diffusive behavior can be understood as follows. The localized diffusive motions confined in the transient cage of neighbor particles, which precede the cage-breaking long-range diffusion jumps, are more spatially constrained for glycerol than for choline because of the stronger hydrogen bonds the former makes with chloride anions. The implications of differential localized mobility of the constituents should be especially important for applications where deep eutectic solvents are confined on the nanometer length scale and their long-range translational diffusion is strongly inhibited (e.g., within microporous media).

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States), TN (United States). Spallation Neutron Source
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1212363
Journal Information:
Journal of Physical Chemistry Letters, Vol. 6, Issue 15; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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  • Azuah, Richard Tumanjong; Kneller, Larry R.; Qiu, Yiming
  • Journal of Research of the National Institute of Standards and Technology, Vol. 114, Issue 6 https://doi.org/10.6028/jres.114.025
journal November 2009

Cited By (6)

Nanoscopic structures and molecular interactions leading to a dystectic and two eutectic points in [EMIm][Cl]/urea mixtures journal January 2018
Rotation and translation dynamics of coumarin 153 in choline chloride-based deep eutectic solvents journal November 2018
Reline aqueous solutions behaving as liquid mixtures of H-bonded co-solvents: microphase segregation and formation of co-continuous structures as indicated by Brillouin and 1 H NMR spectroscopies journal January 2017
Investigation of glycerol hydrogen-bonding networks in choline chloride/glycerol eutectic-forming liquids using neutron diffraction journal January 2019
“Inverted” Deep Eutectic Solvents Based on Host‐Guest Interactions journal October 2019
Water distribution at the electrified interface of deep eutectic solvents journal January 2019

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