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Density functional study of condensation in capped capillaries.

P Yatsyshin¹, N Savva, S Kalliadasis

¹Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|June 19, 2015

Summary

This study investigates liquid adsorption in capped capillaries, revealing distinct condensation behaviors based on temperature. It explores phenomena like corner drops and prewetting films in confined fluid systems.

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Area of Science:

Physical Chemistry
Materials Science
Statistical Mechanics

Background:

Condensation is a critical transition in confined fluids, where the liquid phase fills a pore.
Capped capillaries, formed by orthogonal walls, exhibit unique adsorption behaviors compared to simple slit pores.
Understanding fluid behavior in confined geometries is crucial for applications in porous materials and nanotechnology.

Purpose of the Study:

To investigate liquid adsorption and condensation phenomena in narrow rectangular capped capillaries.
To analyze the influence of temperature on condensation transitions (first-order vs. continuous).
To explore the formation of corner drops and prewetting films in wider capped capillaries.

Main Methods:

Utilized classical statistical mechanics principles.
Employed a detailed numerical investigation of density functional theory (DFT).
Analyzed fluid equilibria for various illustrative case studies.

Main Results:

Identified temperature-dependent condensation: first-order below capillary wetting temperature (Tcw) and continuous above Tcw.
Observed adsorption of metastable under-condensed liquid on the capping wall at T > Tcw.
Predicted three-phase coexistence (gas, corner drops, liquid slabs) and nucleation of finite-length prewetting films in wider capillaries.

Conclusions:

Capped capillaries exhibit complex adsorption and condensation behaviors influenced by geometry and temperature.
The study elucidates the mechanisms of condensation onset, corner filling, and prewetting phenomena in these confined systems.
Findings provide insights into fluid behavior in nanoconfined spaces, relevant for material design and understanding phase transitions.