LOCALIZED ADSORPTION OF COLLOID PARTICLES ON HOMOGENEOUS SURFACES

Kinetics of localized reversible and irreversible adsorption of interacting colloid particles on homogeneous surfaces was analysed. Asymptotic analytical equations were derived for the surface blocking parameter B(THETA), adsorption kinetics and adsorption isotherms in the limit of low and high surface concentrations. In the general case, for arbitrary surface concentration and ionic strength of the suspension, particle adsorption kinetics was simulated numerically using the Monte-Carlo method. Iii the case of irreversible adsorption the theoretical predictions were experimentally tested by applying the direct microscope observation method and the impinging-jet cell. The monodisperse suspension of negatively charged latex particles was used in these experiments with silanized mica sheets as the adsorbing surface. Our theoretical predictions were quantitatively confirmed indicating that the Langmuir model is not appropriate for describing the localized adsorption of particles on homogeneous surfaces.