中国物理B ›› 2020, Vol. 29 ›› Issue (3): 36101-036101.doi: 10.1088/1674-1056/ab695b

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

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

Gan Ren(任淦), Shikai Tian(田时开)   

  1. Departments of Physics&Key Laboratory of Photonic and Optical Detection in Civil Aviation, Civil Aviation Flight University of China, Guanghan 618307, China
  • 收稿日期:2019-08-03 修回日期:2019-12-23 出版日期:2020-03-05 发布日期:2020-03-05
  • 通讯作者: Gan Ren E-mail:rengan@alumni.itp.ac.cn
  • 基金资助:
    Project supported by the Science Foundation of Civil Aviation Flight University of China (Grant Nos. J2019-059 and JG2019-19).

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

Gan Ren(任淦), Shikai Tian(田时开)   

  1. Departments of Physics&Key Laboratory of Photonic and Optical Detection in Civil Aviation, Civil Aviation Flight University of China, Guanghan 618307, China
  • Received:2019-08-03 Revised:2019-12-23 Online:2020-03-05 Published:2020-03-05
  • Contact: Gan Ren E-mail:rengan@alumni.itp.ac.cn
  • Supported by:
    Project supported by the Science Foundation of Civil Aviation Flight University of China (Grant Nos. J2019-059 and JG2019-19).

摘要: 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.

关键词: ionic solutions, Stokes-Einstein relation, non-equilibrium steady state, molecular dynamics simulation

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.

Key words: ionic solutions, Stokes-Einstein relation, non-equilibrium steady state, molecular dynamics simulation

中图分类号:  (Computer simulation of liquid structure)

  • 61.20.Ja
78.30.cd (Solutions and ionic liquids) 82.20.Wt (Computational modeling; simulation)