Relation between Tolman length and isothermal compressibility for simple liquids

doi:10.1088/1674-1056/22/3/036801

Abstract Tolman length δ₀ of the liquid with a plane surface has attracted an increasing theoretical attention in recent years, while the expression of Tolman length in terms of observable quantities is still not very clear. In 2001, Bartell gave a simple expression of Tolman length δ₀ in terms of isothermal compressibility. However, this expression predicts that Tolman length is always negative, which is contrary to the results of molecular dynamics simulations (MDS) for simple liquids. In this paper, this contradiction is analyzed and the reason for the discrepancy in the sign is found. In addition, we introduce a new expression of Tolman length in terms of isothermal compressibility for simple fluids not near the critical points under some week restrictions. The Tolman length of simple liquids calculated by using this formula is consistent with that obtained using MDS regarding the sign.

Keywords: Tolman length isothermal compressibility surface tension thermodynamics

Received: 02 July 2012
Revised: 08 August 2012
Accepted manuscript online:

PACS:	68.03.Cd	(Surface tension and related phenomena)
	68.35.Md	(Surface thermodynamics, surface energies)
	05.70.Np	(Interface and surface thermodynamics)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11072242) and the Knowledge Innovation Program of the Chinese Academy of Sciences.

Corresponding Authors: Zhu Ru-Zeng
E-mail: zhurz@lnm.imech.ac.cn

Cite this article:

Wang Xiao-Song (王小松), Zhu Ru-Zeng (朱如曾) Relation between Tolman length and isothermal compressibility for simple liquids 2013 Chin. Phys. B 22 036801

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