Influence of disordered porous media in the anomalous properties of a simple water model

TL;DR

This study investigates how disordered porous media affect the anomalous thermodynamic, dynamic, and structural properties of a water-like model, revealing that dense obstacles suppress water's anomalies and critical points.

Contribution

It introduces a lattice gas model to analyze the impact of disordered porous matrices on water-like anomalies, highlighting the suppression effects of dense obstacles.

Findings

Obstacles shorten phase coexistence and anomalous lines.

Dense matrices suppress anomalies and critical points.

The model replicates water's density and diffusion anomalies.

Abstract

The thermodynamic, dynamic and structural behavior of a water-like system confined in a matrix is analyzed for increasing confining geometries. The liquid is modeled by a two dimensional associating lattice gas model that exhibits density and diffusion anomalies, in similarity to the anomalies present in liquid water. The matrix is a triangular lattice in which fixed obstacles impose restrictions to the occupation of the particles. We show that obstacules shortens all lines, including the phase coexistence, the critical and the anomalous lines. The inclusion of a very dense matrix not only suppress the anomalies but also the liquid-liquid critical point.