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 for2H,7Li, and133Cs nuclei. The diffusion coefficients (D) for1H,7Li, and133Cs 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.

Original languageEnglish
Pages (from-to)22895-22901
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume21
Issue number41
DOIs
Publication statusPublished - 1 Jan 2019

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Salts
Nuclear magnetic resonance
Electrolytes
salts
nuclear magnetic resonance
Water
electrolytes
Ions
water
diffusion coefficient
ions
nuclei
Spin-lattice relaxation
spin-lattice relaxation
Relaxation time
retraining
relaxation time
life (durability)
Molecules
cesium chloride

Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

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title = "Local dynamics in LiCl-CsCl-D2O water-in-salt solutions according to NMR relaxation",
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 for2H,7Li, and133Cs nuclei. The diffusion coefficients (D) for1H,7Li, and133Cs 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.",
author = "Valeriia Baranauskaite and Olga Pestova and Mikhail Vovk and Vladimir Matveev and Erkki L{\"a}hderanta",
year = "2019",
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TY - JOUR

T1 - Local dynamics in LiCl-CsCl-D2O water-in-salt solutions according to NMR relaxation

AU - Baranauskaite, Valeriia

AU - Pestova, Olga

AU - Vovk, Mikhail

AU - Matveev, Vladimir

AU - Lähderanta, Erkki

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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 for2H,7Li, and133Cs nuclei. The diffusion coefficients (D) for1H,7Li, and133Cs 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.

AB - 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 for2H,7Li, and133Cs nuclei. The diffusion coefficients (D) for1H,7Li, and133Cs 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.

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