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Enhanced coarsening induced by pore confinement.
A Salame1, V-T Nguyen1, V Langlois1
1ENPC, Univ Gustave Eiffel, Laboratoire Navier, CNRS.
Physical Review. E
|February 20, 2025
Summary
Confinement accelerates coarsening in liquid foams, contrary to expectations. This study reveals how pore size and liquid distribution impact particle arrangement and stability in confined systems.
Area of Science:
- Materials Science
- Physical Chemistry
- Soft Matter Physics
Background:
- Coarsening reduces interfacial energy, enlarging particle sizes in two-phase systems.
- Confined particles can exhibit anticoarsening, leading to one particle per pore.
- Liquid foams are common in alloys, emulsions, and supersaturated solutions.
Purpose of the Study:
- To quantitatively investigate liquid foam coarsening dynamics within confined spherical bead packings.
- To explore how varying bead sizes (confinement degree) affect coarsening.
- To understand the unexpected acceleration of coarsening under confinement.
Main Methods:
- Utilizing spherical bead packings to create controlled confinement for liquid foam.
- Adjusting bead sizes to systematically alter the degree of confinement.
- Quantitatively analyzing coarsening dynamics and particle size distribution.
Main Results:
- Increased confinement accelerates foam coarsening, unlike unconfined systems.
- Broadening of particle size distribution has an opposite effect under confinement.
- Unexpected behavior stems from the coupling of surface-adsorbed liquid and core liquid fraction.
Conclusions:
- Confinement's effect on coarsening is complex and depends on pore geometry.
- Liquid distribution and interfacial phenomena are key drivers of coarsening in confined foams.
- Findings challenge previous assumptions about anticoarsening in confined systems.
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