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arXiv 0903.1307cond-mat.softcond-mat.stat-mech
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不同压力下粘性液体扩散系数的密度标度

Density scaling of the diffusion coefficient at various pressures in viscous liquids

A. N. Papathanassiou

摘要:

基础热力学和早期的弹性固态点缺陷模型[P. Varotsos和K。Alexopoulos,Phys. Rev B 15,4111(1977); 18,2683(1978)]被用来制定描述粘性液体中扩散系数的密度标度的解析二阶多项式函数。函数参数仅由标度指数确定,标度指数与Gruneisen常数直接相关。在不同压力下得到的密度标度扩散系数等温线在一条唯一的主曲线上崩溃,与最近Lennard-Jones粘性液体的计算机模拟结果一致,[D. Coslovich和C.M. Roland,J.Phys.Chem.B112,1329(2008)]。

英文摘要:

Fundamental thermodynamics and an earlier elastic solid-state point defect model [P. Varotsos and K. Alexopoulos, Phys. Rev B 15, 4111 (1977); 18, 2683 (1978)] are employed to formulate an analytical second-order polynomial function describing the density scaling of the diffusion coefficient in viscous liquids. The function parameters are merely determined by the scaling exponent, which is directly connected with the Gruneisen constant. Density scaling diffusion coefficient isotherms obtained at different pressures collapse on a unique master curve, in agreement with recent computer simulation results of Lennard-Jones viscous liquids, [D. Coslovich and C.M. Roland, J. Phys. Chem. B 112, 1329 (2008)].

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