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Published on: May 26, 2014
Micelle enrichment in liquid foams
1Laue - Paul Langevin, Institut Max von , 38100 Grenoble, France.
Physical Review. E
|July 24, 2026
Summary
Foam liquids are not uniform. Micellar concentration increases with foam age and height, challenging assumptions in separation processes and foam stability studies.
Area of Science:
- Physical Chemistry
- Colloid and Surface Science
- Foam Science
Background:
- Foam-based separation processes rely on surfactant enrichment.
- Foam liquid composition is often assumed to be uniform due to efficient gradient dissipation.
Purpose of the Study:
- To directly quantify micelle concentrations in foam liquid channels.
- To distinguish micellar concentration from interfacial surfactant.
- To investigate micellar concentration changes over time and height in steady-state foam.
Main Methods:
- Contrast-matched small-angle neutron scattering (SANS).
- Direct quantification of micelle concentrations in foam liquid channels.
- Distinguishing between micellar and interfacial surfactant.
Main Results:
- Micellar concentration in Plateau borders increases with foam age and height.
- Concentrations reached over two orders of magnitude above initial solution levels.
- Observed gradients were explained by upward interfacial transport driven by bubble aging.
Conclusions:
- Foam liquid composition is not uniform, contrary to common assumptions.
- Micellar gradients significantly impact foam-based separation processes and foam stability.
- Interfacial transport driven by bubble aging is the primary mechanism for surfactant accumulation.
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