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• W2018048921 abstract "The fractional Stokes–Einstein (FSE) relation, (D/T)∝η−t, is shown to well correlate the molecular dynamics results of Meier et al. [J. Chem. Phys. 121, 3671 (2004); Meier et al.J. Chem. Phys. 121, 9526 (2004)] for the viscosity (η) and self-diffusion coefficient (D) of the Lennard-Jones fluid in the liquid and dense supercritical states, with the exponent t=(0.921±0.003). The Stokes–Einstein number n is viscosity dependent: ln n=const+(t−1)ln η. Molecular and ionic liquids for which high-pressure transport property data are available in the literature are shown to exhibit the same behavior with 0.79&lt;t&lt;1. Water is also shown to fit the FSE at atmospheric pressure, with a change in exponent t from 0.94 to 0.67 at about 258 K (265 K for D2O), but the FSE holds only approximately at high pressures. It sometimes argued that FSE in supercooled liquids near the glass transition is a diagnostic for dynamic heterogeneity, but this work shows that the FSE holds in normal liquids far from the glass transition. This result may provide a reference for complex liquids such as viscous glass formers that show a transition (dynamic crossover) in the temperature dependence of the viscosity and network-bonded liquids such as water." @default.
• W2018048921 created "2016-06-24" @default.
• W2018048921 creator A5014628803 @default.
• W2018048921 date "2009-08-04" @default.
• W2018048921 modified "2023-10-12" @default.
• W2018048921 title "The fractional Stokes–Einstein equation: Application to Lennard-Jones, molecular, and ionic liquids" @default.
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