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Related Experiment Videos

Colloidal Particles at Solid-Liquid Interfaces: Mechanisms of Desorption Kinetics

Weiss1, Lüthi, Ricka

  • 1Institute of Applied Physics, University of Bern, Sidlerstr. 5, Bern, CH-3012, Switzerland

Journal of Colloid and Interface Science
|October 8, 1998
PubMed
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Colloid sorption on charged surfaces involves both adsorption and desorption over weeks. Desorption kinetics are influenced by factors like potential barriers and bond aging, as shown by model calculations and experiments.

Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Colloid sorption on equally charged surfaces is complex, involving reversible adsorption and desorption over extended timescales (hours to weeks).
  • Understanding desorption kinetics is crucial for applications involving particle adhesion and stability.

Purpose of the Study:

  • To investigate the factors influencing colloid desorption kinetics on equally charged surfaces.
  • To develop a model that explains the interplay between adsorption and desorption.
  • To experimentally validate the model using in situ observations of polystyrene latex particles on glass.

Main Methods:

  • Theoretical modeling of desorption kinetics considering readsorption, potential barriers, secondary minima, potential variations, and bond aging.

Related Experiment Videos

  • In situ observation of colloid sorption kinetics using the evanescent field method combined with video microscopy.
  • Determination of the adhesion time distribution function from individual particle arrival and departure times.

    • Main Results:

    • Model calculations demonstrate that desorption kinetics are significantly affected by readsorption, potential barriers, secondary minima, local potential variations, and bond aging.
    • Experimental results show a nonexponential adhesion time distribution function for polystyrene latex particles on glass.
    • The observed nonexponentiality is explained by a gamma distribution of potential depths at binding sites and logarithmic bond aging.

    Conclusions:

    • Colloid desorption from equally charged surfaces is a dynamic process influenced by multiple factors, not simply irreversible adsorption.
    • The adhesion time distribution function provides insights into the heterogeneity of binding sites and the aging of bonds.
    • The findings contribute to a deeper understanding of colloid-surface interactions and adhesion dynamics.