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Updated: Nov 21, 2025
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Nanothermodynamic Description and Molecular Simulation of a Single-Phase Fluid in a Slit Pore
Olav Galteland1, Dick Bedeaux1, Signe Kjelstrup1
1PoreLab, Department of Chemistry, Norwegian University of Science and Technology, 7491 Trondheim, Norway.
Nanomaterials (Basel, Switzerland)
|January 14, 2021
Summary
This study introduces nanothermodynamics to describe confined fluids in slit pores. It reveals wall structures are energetic, not entropic, advancing nanotechnology.
Area of Science:
- Thermodynamics
- Nanotechnology
- Physical Chemistry
Background:
- Understanding confined fluids is crucial for nanotechnology.
- Existing thermodynamic models struggle with small systems.
Purpose of the Study:
- To apply Hill's nanothermodynamics to confined single-phase, single-component fluids.
- To define disjoining pressure and explore thermodynamic properties in slit pores.
Main Methods:
- Constructed an ensemble of slit pores with controlled variables.
- Applied Hill's integral and differential properties.
- Validated findings with molecular simulations.
Main Results:
- Defined disjoining pressure based on nanothermodynamics.
- Identified thermodynamic pressures with mechanical counterparts.
- Confirmed wall structures are energetic, not entropic.
- Found non-zero subdivision potential for small surface areas.
Conclusions:
- Nanothermodynamics provides a robust framework for confined fluids.
- Derived new Maxwell and scaling relations for confined systems.
- This work expands nanothermodynamics for future research in confined fluid behavior.
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