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Surfactant adsorption kinetics in microfluidics.

Birte Riechers1, Florine Maes1, Elias Akoury2

  • 1Soft Microsystems, Centre de Recherche Paul Pascal, Unité Propre de Recherche 8641, CNRS, University of Bordeaux, 33600 Pessac, France; Droplets, Membranes and Interfaces, Max Planck Institute for Dynamics and Self-Organization, 37077 Goettingen, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 2016
PubMed
Summary
This summary is machine-generated.

We developed a microfluidic method to measure surfactant adsorption kinetics at droplet interfaces. This technique quantifies emulsion stability and surfactant behavior, crucial for understanding dispersions.

Keywords:
dropletemulsioninterfacesmicrofluidicssurfactant

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Microfluidics

Background:

  • Emulsions are metastable dispersions whose stability depends on surfactant dynamics.
  • Understanding surfactant adsorption kinetics is key to controlling emulsion properties like foaming and coarsening.
  • Existing methods lack precision in measuring the rapid dynamics of surfactant-interface interactions.

Purpose of the Study:

  • To develop a microfluidic method for precisely measuring surfactant adsorption kinetics at the droplet interface.
  • To quantitatively link surfactant adsorption/desorption processes to emulsion stabilization timescales.
  • To establish a method applicable to various surfactant types, including nonionic surfactants.

Main Methods:

  • Utilized a microfluidic device to create small droplets for kinetic measurements.
  • Employed pH decay within droplets as a direct readout for carboxylic acid surfactant adsorption.
  • Ensured bulk transport limitations were negligible due to small droplet size and convection.

Main Results:

  • Successfully measured the kinetics of surfactant adsorption to the droplet interface.
  • Demonstrated that adsorption kinetics directly determine the timescale for droplet stabilization against coalescence.
  • Quantified the required interface coverage (> [Formula: see text]) to prevent coalescence.

Conclusions:

  • The developed microfluidic method accurately quantifies surfactant adsorption kinetics and its impact on emulsion stability.
  • Established a quantitative link between adsorption/desorption, emulsion stabilization, and solute partitioning timescales.
  • The method provides a versatile platform for studying diverse surfactant systems and interfacial phenomena.