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Chin. Phys. B, 2020, Vol. 29(3): 036101    DOI: 10.1088/1674-1056/ab695b

Fractional variant of Stokes-Einstein relation in aqueous ionic solutions under external static electric fields

Gan Ren(任淦), Shikai Tian(田时开)
Departments of Physics&Key Laboratory of Photonic and Optical Detection in Civil Aviation, Civil Aviation Flight University of China, Guanghan 618307, China
Abstract  Both ionic solutions under an external applied static electric field E and glassy-forming liquids under undercooled state are in non-equilibrium state. In this work, molecular dynamics (MD) simulations with three aqueous alkali ion chloride (NaCl, KCl, and RbCl) ionic solutions are performed to exploit whether the glass-forming liquid analogous fractional variant of the Stokes-Einstein relation also exists in ionic solutions under E. Our results indicate that the diffusion constant decouples from the structural relaxation time under E, and a fractional variant of the Stokes-Einstein relation is observed as well as a crossover analogous to the glass-forming liquids under cooling. The fractional variant of the Stokes-Einstein relation is attributed to the E introduced deviations from Gaussian and the nonlinear effect.
Keywords:  ionic solutions      Stokes-Einstein relation      non-equilibrium steady state      molecular dynamics simulation  
Received:  03 August 2019      Revised:  23 December 2019      Published:  05 March 2020
PACS:  61.20.Ja (Computer simulation of liquid structure) (Solutions and ionic liquids)  
  82.20.Wt (Computational modeling; simulation)  
Fund: Project supported by the Science Foundation of Civil Aviation Flight University of China (Grant Nos. J2019-059 and JG2019-19).
Corresponding Authors:  Gan Ren     E-mail:

Cite this article: 

Gan Ren(任淦), Shikai Tian(田时开) Fractional variant of Stokes-Einstein relation in aqueous ionic solutions under external static electric fields 2020 Chin. Phys. B 29 036101

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