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Diffusion of surfactant from a micellar solution to a bare interface. 1. Absorbing boundary
Joshua A Mysona1, Alon V McCormick1, David C Morse1
1Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave. SE, Minneapolis, MN 55455, USA.
Journal of Colloid and Interface Science
|February 16, 2023
Summary
This study models surfactant adsorption to a new surface, observing micelle dissociation and a micelle-free zone formation. The findings offer insights into dynamic adsorption processes and micellar behavior near interfaces.
Area of Science:
- Physical Chemistry
- Surface Science
- Colloid Science
Background:
- Dynamic adsorption of surfactants influences interfacial phenomena.
- Understanding micelle behavior near interfaces is crucial for various applications.
Purpose of the Study:
- To analyze the dynamic adsorption of surfactant monomers to a newly formed surface.
- To model micelle dissociation and the formation of a micelle-free region near the interface.
Main Methods:
- Developed scaling arguments and approximate models.
- Performed numerical simulations of reaction-diffusion equations for polydisperse systems.
- Investigated surfactant monomers and clusters of arbitrary aggregation number.
Main Results:
- Observed rapid micelle shrinkage and dissociation near the interface.
- Identified the formation of a micelle-free region with width increasing as t^1/2.
- Characterized intermediate and final equilibrium stages based on bulk relaxation times.
Conclusions:
- The idealized model provides a prototype for understanding surfactant adsorption dynamics.
- Suppression of monomer concentration accelerates micelle dissociation.
- The study lays groundwork for analyzing more complex, realistic boundary conditions.
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