Explaining why simple liquids are quasi-universal

被引:57
作者
Bacher, Andreas K. [1 ]
Schroder, Thomas B. [1 ]
Dyre, Jeppe C. [1 ]
机构
[1] Roskilde Univ, Dept Sci, IMFUFA, DNRF Ctr Glass & Time, DK-4000 Roskilde, Denmark
基金
新加坡国家研究基金会;
关键词
TRANSPORT-COEFFICIENTS; HARD-SPHERE; SCALING PRINCIPLE; PHASE-TRANSITIONS; SIMPLE FLUIDS; DYNAMICS; SYSTEMS; MATTER; EQUILIBRIUM; POTENTIALS;
D O I
10.1038/ncomms6424
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
It has been known for a long time that many simple liquids have surprisingly similar structure as quantified, for example, by the radial distribution function. A much more recent realization is that the dynamics are also very similar for a number of systems with quite different pair potentials. Systems with such non-trivial similarities are generally referred to as 'quasi-universal'. From the fact that the exponentially repulsive pair potential has strong virial potential-energy correlations in the low-temperature part of its thermodynamic phase diagram, we here show that a liquid is quasi-universal if its pair potential can be written approximately as a sum of exponential terms with numerically large prefactors. Based on evidence from the literature we moreover conjecture the converse, that is, that quasi-universality only applies for systems with this property.
引用
收藏
页数:7
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