Density scaling as a property of strongly correlating viscous liquids

Details Density scaling as a property of strongly correlating viscous liquids Density scaling as a property of strongly correlating viscous liquids

2008-03-14

arxiv.org/abs/0803.2199v2

Phys. Rev. E 80, 041502 (2009)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 5 figures. Data added for Lewis-Wahnstrom OTP

Scientific paper

10.1103/PhysRevE.80.041502

We address a recent conjecture according to which the relaxation time $\tau$ of a viscous liquid obeys density scaling ($\tau=F(\rho^\gamma/T)$ where $\rho$ is density) if the liquid is ``strongly correlating,'' i.e., has almost 100% correlation between equilibrium virial and potential-energy fluctuations [Pedersen {\it et al.}, PRL {\bf 100}, 011201 (2008)]. Computer simulations of two model liquids - an asymmetric dumbbell model and the Lewis-Wahnstr\"om OTP model - confirm the conjecture and demonstrate that the scaling exponent $\gamma$ can be accurately predicted from equilibrium fluctuations.

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