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Fractional Stokes-Einstein relation in TIP5P water at high temperatures |
Gan Ren(任淦), Ge Sang(桑革) |
Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621908, China |
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Abstract Fractional Stokes-Einstein relation described by D~(τ/T ight)ξ is observed in supercooled water, where D is the diffusion constant, τ the structural relaxation time, T the temperature, and the exponent ξ≠-1. In this work, the Stokes-Einstein relation in TIP5P water is examined at high temperatures within 400 K-800 K. Our results indicate that the fractional Stokes-Einstein relation is explicitly existent in TIP5P water at high temperatures, demonstrated by the two usually adopted variants of the Stokes-Einstein relation, D~τ-1and D~T/τ, as well as by D~T/η, where η is the shear viscosity. Both D~τ-1 and D~T/τ are crossed at temperature Tx=510 K. The D~τ-1 is in a fractional form as D~τξ with ξ=-2.09 for T ≤ Tx and otherwise ξ=-1.25. The D~T/τ is valid with ξ=-1.01 for T ≤ Tx but in a fractional form for T> Tx. The Stokes-Einstein relation D~T/η is satisfied below Tx=620 K but in a fractional form above Tx. We propose that the breakdown of D~T/η may result from the system entering into the super critical region, the fractional forms of D~τ-1 and D~T/τ are due to the disruption of the hydration shell and the local tetrahedral structure as well as the increase of the shear viscosity.
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Received: 15 January 2018
Revised: 22 March 2018
Accepted manuscript online:
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PACS:
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61.20.Ja
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(Computer simulation of liquid structure)
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61.20.Gy
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(Theory and models of liquid structure)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No.2153200) and the China Postdoctoral Science Foundation (Grant No.2016M602712). |
Corresponding Authors:
Gan Ren
E-mail: renganzyl@sina.com
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Cite this article:
Gan Ren(任淦), Ge Sang(桑革) Fractional Stokes-Einstein relation in TIP5P water at high temperatures 2018 Chin. Phys. B 27 066101
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