Extended Generic Nature of Surface Entropy

TL;DR

This paper investigates the universality of surface tension correlations in hydrocarbons, deriving a functional reduced surface entropy that aligns with Trouton's rule and remains consistent across temperature ranges.

Contribution

It introduces a generalized form of surface entropy based on the critical exponent, demonstrating its universal validity from freezing to critical temperature.

Findings

Surface entropy follows a Trouton's rule-like relation.

Derived surface entropy remains constant at 0.9990 across temperatures.

Universal behavior observed for C5-C8 hydrocarbons.

Abstract

The recent empirical correlation for the surface tension is further investigated for universality. C5-C8 liquid hydrocarbons, for which accurate surface tension data over the complete liquid range are available, are used. Functional reduced surface entropy is derived, which is in the general form of Trouton's rule. It is characterized by the critical exponent of surface tension and is valid with the unique value 0.9990 at any temperature from freezing to critical temperature of the liquid hydrocarbons. Relation to generic nature of surface entropy is pursued.