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Related Experiment Videos

Short-time behavior of mixed diffusion-barrier controlled adsorption.

Srinivas Nageswaran Moorkanikkara1, Daniel Blankschtein

  • 1Department of Chemical Engineering, Room 66-444, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Journal of Colloid and Interface Science
|October 26, 2005
PubMed
Summary

This study reconciles surfactant adsorption kinetics, showing that apparent diffusion control at short times is consistent with a mixed diffusion-barrier model. The energy barrier is linked to single molecule adsorption onto clean surfaces.

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Area of Science:

  • Surface Chemistry
  • Physical Chemistry
  • Colloid Science

Background:

  • Short-time adsorption kinetics of nonionic surfactants at water/air interfaces are often interpreted using diffusion-controlled models.
  • Experimental dynamic surface tension (DST) data showing a t variation at short times are typically seen as evidence for diffusion control.
  • This interpretation has led to the hypothesis that energy barriers are related to high surfactant surface concentrations.

Purpose of the Study:

  • To reconcile the discrepancy between theoretical predictions and experimental observations of short-time surfactant adsorption kinetics.
  • To develop a new nonasymptotic short-time formalism for the mixed diffusion-barrier controlled adsorption model.
  • To re-evaluate the nature of the energy barrier in surfactant adsorption.

Main Methods:

Related Experiment Videos

  • Derivation of a new nonasymptotic short-time formalism for the mixed diffusion-barrier controlled model.
  • Application of the formalism to surfactant adsorption onto a spherical pendant-bubble surface.
  • Determination of the applicable ranges of time and surfactant surface concentration for the new formalism.

Main Results:

  • The new formalism demonstrates that an apparent t variation in DST can be observed even under mixed diffusion-barrier controlled adsorption conditions.
  • This finding challenges the conventional interpretation of short-time DST behavior.
  • The study provides a framework for understanding adsorption kinetics across different time scales and surface concentrations.

Conclusions:

  • The apparent diffusion-controlled adsorption kinetics at short times do not necessarily imply a purely diffusion-controlled mechanism.
  • The energy barrier in surfactant adsorption is associated with the adsorption of a single surfactant molecule onto a clean surface.
  • The mixed diffusion-barrier controlled model offers a more comprehensive explanation for observed adsorption phenomena.