Supercooled liquids analogous fractional Stokes–Einstein relation in NaCl solution above room temperature

作     者：Gan Ren Shikai Tian 任淦;田时开

作者机构：Departments of Physics & Key Laboratory of Photonic and Optical Detection in Civil AviationCivil Aviation Flight University of China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第7期

页      面：381-388页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：Project supported by the Foundation of Civil Aviation Flight University of China(Grant Nos.J2019-059 and JG2019-19) 

主　　题：sodium chloride solutions supercooled liquids molecular dynamics Stokes–Einstein relation 

摘      要：The Stokes–Einstein relation D^T/η and its two variants D~τ-1 and D^T/τ follow a fractional form in supercooled liquids, where D is the diffusion constant, T the temperature,η the shear viscosity, and τ the structural relaxation *** fractional Stokes–Einstein relation is proposed to result from the dynamic heterogeneity of supercooled *** this work, by performing molecular dynamics simulations, we show that the analogous fractional form also exists in sodium chloride(NaCl) solutions above room temperature.D~τ-1 takes a fractional form within 300–800 K;a crossover is observed in both D^T/τ and D^T/η.Both D^T/τ and D^T/η are valid below the crossover temperature Tx,but take a fractional form for T *** results indicate that the fractional Stokes–Einstein relation not only exists in supercooled liquids but also exists in NaCl solutions at high enough temperatures far away from the glass transition *** propose that D^T/η and its two variants should be critically evaluated to test the validity of the Stokes–Einstein relation.