Peculiarities in the behavior of the entropy diameter for molecular liquids as the reflection of molecular rotations and the excluded volume effects

TL;DR

This paper investigates how the entropy diameter of molecular liquids reflects molecular rotations and excluded volume effects, revealing sensitivity to rotational motion changes and proposing a model for phase coexistence.

Contribution

It introduces a model of compressible effective volume to describe phase coexistence in terms of density and entropy, highlighting the impact of molecular rotations.

Findings

Entropy diameter is sensitive to molecular rotational behavior.

Rotational motion changes influence the entropy diameter.

Proposed model captures phase coexistence effects.

Abstract

The behavior of the diameter of the coexistence curve in terms of the entropy and the corresponding diameter are investigated. It is shown that the diameter of the coexistence curve in term of the entropy is sensitive to the change in the character of the rotational motion of the molecule in liquid phase which is governed by the short range correlations. The model of the compressible effective volume is proposed to describe the phase coexistence both in terms of the density and the entropy.