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Scaling Model of Low-Temperature Transport Properties for Molecular and Ionic Liquids

机译:分子和离子液体的低温输运性质的尺度模型

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摘要

The universal scaling concept is applied to the low-temperature range ofany liquid states and substanceslocated between the melting (Tm) and normal boiling (Tb) points far away from the critical region. The physical reason to develop such approach is the revealed collapse of all low-temperature isotherms onto thesingle universal oneargued by the model of fluctuational thermodynamics (FT) proposed recently by author. The pressure reduced by the molecular parameters of the effectiveshort-range Lennard-Jones(LJ)potentialdepends here only on the reduced density. To demonstrate the extraordinary predictive abilities of the developed low-temperature scaling model it has been applied to the prediction of equilibrium and transport (kinetic and dynamic viscosity, self-diffusion, and thermal conductivity) properties not only formolecular liquidsbut also for molten organic salts termedionic liquids(ILs). The best argument in favor of the proposed methodology is the appropriate consistency with the scarce experiments prediction of transport coefficients for ILs on the base of universal scaling function constructed for thesimplest LJ-like liquid argon. The only input data of any substance for prediction are the linear approximations ofT-dependent density and isobaric heat capacity taken from the standard measurements at atmospheric pressure.
机译:通用缩放比例概念适用于任何液态状态的低温范围,并且位于远离临界区的熔点(Tm)和正常沸点(Tb)之间的物质。开发这种方法的物理原因是作者最近提出的波动热力学模型(FT)揭示了所有低温等温线都崩溃到单个通用域上。有效短程Lennard-Jones(LJ)电势的分子参数所降低的压力在此仅取决于降低的密度。为了证明已开发的低温结垢模型的非凡预测能力,该模型已被用于预测平衡和传输(动力学和动态粘度,自扩散和热导率)特性,不仅是分子状液体,而且还用于熔融有机盐液体(IL)。支持所提出的方法的最佳论据是与基于简单的LJ状液态氩构造的通用标度函数的IL的稀疏实验预测的适当一致性。用于预测的任何物质的唯一输入数据是依赖于T的密度和等压热容量的线性近似值,这些线性近似值是从大气压下的标准测量值获得的。

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