Year: 2023
Type: preprint
Abstract: A fluid in contact with a flat structureless wall constitutes the simplest interface system, but the fluid-wall interfacial tension cannot be trivially and even unequivocally determined due to the ambiguity in identifying the precise location of fluid-wall dividing surface. To resolve this long-standing problem, we here derive the interfacial tension from two independent routes without needing the identification of dividing surface. The first one exploits a natural idea that the interfacial profiles of intensive quantities should remain perfectly invariant when deforming the fluid-wall system just to change its interface area. The second one considers the fluid-wall system as the limit of a fluid under a finite external potential field. By calculating the work required to create a differential interface area, the two methods yield exactly the same interfacial tension. Thus, our work provides strong evidence that the fluid-wall interfacial tension can be unambiguously quantified.
Source: arXiv (Cornell University)
Authors: Li, Longfei, Yang, Mingcheng
Language: English
Subfield: Physical and Theoretical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
Awards: G6049782932, G6834610103
OpenAlex ID: W4390215353