A1 Journal article (refereed), original research

Local dynamics in LiCl-CsCl-D2O water-in-salt solutions according to NMR relaxation


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Publication Details
Authors: Baranauskaite V., Pestova O., Vovk M., Matveev V., Lähderanta E.
Publisher: Royal Society of Chemistry
Publication year: 2019
Language: English
Related Journal or Series Information: Physical Chemistry Chemical Physics
Journal name in source: Physical Chemistry Chemical Physics
Journal acronym: PCCP
Volume number: 21
Issue number: 41
Start page: 22895
End page: 22901
Number of pages: 7
ISSN: 1463-9076
eISSN: 1463-9084
JUFO-Level of this publication: 2
Open Access: Not an Open Access publication

Abstract

The main purpose of this study was to investigate the local structure and dynamics in ‘water-in-salt’ solutions, namely the ternary concentrated LiCl–CsCl–D2O electrolytes. Water based electrolyte solutions are components of natural waters, they are very widespread and possess many practical abilities. NMR was applied as the main technique to study the local structure of the solutions as well as ion and solvent dynamics. The characteristic reorientation times (τc) were calculated from spin–lattice relaxation times for 2H, 7Li, and 133Cs nuclei. The diffusion coefficients (D) for 1H, 7Li, and 133Cs nuclei were also obtained. We have confirmed that most of the molecules and ions are combined into dynamic clusters, ‘cybotactic groups’, with lifetimes long enough for them to diffuse as a whole unit. Thus, the results provide direct experimental confirmation of the existence of ‘cybotactic groups’ predicted earlier for concentrated electrolyte solutions. The precise self-diffusion coefficients show the state of ions in the system and can be used as a reference for modelling of such systems.


Last updated on 2020-20-03 at 10:03