Augmented scaled particle theory for a hard disk fluid

The success of scaled particle theory (SPT) can be certainly ascribed to the appealing physical idea embedded in it, i.e., accounting for the work needed to insert a particle into a liquid by a bulk contribu-tion and a surface contribution. So, it can describe bulk and surface thermodynamic properties in the same framework. The surface tension term in SPT involves one flat-surface contribution and two addi-tional contributions due to surface curvatures. High-order curvature terms (also called non-Hadwiger terms) were evidenced. Recently, we have developed an augmented scaled particle theory (ASPT) by add-ing one high-order curvature term for a hard sphere fluid. Here, we extend ASPT to a two-dimensional hard disk fluid. As for the 3D case, our 2D ASPT allows for improving both bulk and surface thermody-namic properties of a hard disk fluid with respect to the original SPT.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

The success of scaled particle theory lies in its incorporation of the physical idea of accounting for the work needed to insert a particle into a liquid. An augmented scaled particle theory has been developed by adding high-order curvature terms, allowing for improved thermodynamic properties of hard disk fluids.