Relation between pore size and the compressibility of a confined fluid

Gennady Y. Gor, Daniel W. Siderius, Christopher J. Rasmussen, William P. Krekelberg, Vincent K. Shen, Noam Bernstein

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


When a fluid is confined to a nanopore, its thermodynamic properties differ from the properties of a bulk fluid, so measuring such properties of the confined fluid can provide information about the pore sizes. Here, we report a simple relation between the pore size and isothermal compressibility of argon confined in such pores. Compressibility is calculated from the fluctuations of the number of particles in the grand canonical ensemble using two different simulation techniques: conventional grand-canonical Monte Carlo and grand-canonical ensemble transition-matrix Monte Carlo. Our results provide a theoretical framework for extracting the information on the pore sizes of fluid-saturated samples by measuring the compressibility from ultrasonic experiments.

Original languageAmerican English
Article number194506
JournalJournal of Chemical Physics
Issue number19
StatePublished - Nov 21 2015
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

Cite this