Capillary condensation in one-dimensional irregular confinement

TL;DR

This paper introduces an exact lattice-gas model for one-dimensional irregular pores that accurately predicts fluid adsorption behavior, supported by simulations, advancing the understanding of capillary condensation in complex porous structures.

Contribution

It presents a novel exact solution for fluid condensation in irregular one-dimensional pores, integrating heterogeneity and finite-temperature effects.

Findings

Exact zero-temperature solution matches experimental adsorption data.

Finite-temperature simulations confirm analytical predictions.

Framework aids structural analysis of porous media from adsorption data.

Abstract

A lattice-gas model with heterogeneity is developed for the description of fluid condensation in finite sized one-dimensional pores of arbitrary shape. An exact solution of the model is presented for zero-temperature that reproduces the experimentally observed dependence of the amount of fluid adsorbed in the pore on external pressure. Finite-temperature Metropolis dynamics simulations support analytical findings in the limit of low temperatures. The proposed framework is viewed as a fundamental building block of the theory of capillary condensation necessary for reliable structural analysis of complex porous media from adsorption-desorption data.