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Vapour-liquid phase diagram for an ionic fluid in a random porous medium
M F Holovko1, O Patsahan, T Patsahan
1Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine.
Summary
We investigated ionic fluid phase behavior in porous materials. Decreasing porosity shifts the critical point to lower densities and temperatures, narrowing the coexistence region.
Area of Science:
- Physical Chemistry
- Materials Science
- Thermodynamics
Background:
- Ionic fluids exhibit complex phase behavior.
- Confinement in porous media significantly alters fluid properties.
- Understanding these effects is crucial for applications in materials science and chemical engineering.
Purpose of the Study:
- To theoretically model the vapor-liquid phase behavior of an ionic fluid within a disordered porous matrix.
- To investigate the influence of matrix porosity and particle size ratio on the ionic fluid's phase diagram.
- To develop a predictive framework for confined ionic systems.
Main Methods:
- Utilized a theoretical approach combining the method of collective variables and scaled-particle theory (SPT).
- Modeled the ionic fluid as a restricted primitive model (RPM) of oppositely charged hard spheres.
- Calculated phase diagrams using random-phase approximation and considering higher-order correlations.
Main Results:
- The critical point shifts to lower fluid densities and temperatures as matrix porosity decreases.
- The vapor-liquid coexistence region narrows with reduced porosity.
- Increasing matrix particle size leads to higher critical temperature and density for a fixed porosity.
Conclusions:
- Porous media significantly influence ionic fluid phase behavior.
- The developed theoretical model accurately captures the effects of confinement on vapor-liquid phase diagrams.
- Findings provide insights into the thermodynamics of ionic fluids in disordered porous environments.
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