ADSORPTION OF COLLOID PARTICLES AFFECTED BY HYDRODYNAMIC-FORCES

Irreversible adsorption of colloid particles interacting electrostatic ally from the well-defined flows was studied experimentally and theore tically. The impinging-jet cell was used to form the axis-symmetric la minar flow enabling a direct microscope determination of the particle adsorption kinetics. Determining the influence of flow intensity (shea r rate) on the particle adsorption kinetics was possible due to monodi sperse suspensions of polystyrene latex particles. The Brownian-Dynami cs numerical simulation method was used for interpreting the experimen tal data. It was found that this theoretical method reflected well the characteristic features of the adsorption experiments, especially the ''hydrodynamics scattering'' effect. This effect leads to a considera ble decrease of adsorption kinetics for higher flow shear rates and lo w ionic strength due to the coupling between the hydrodynamics and ele ctrostatic double-layer forces. This phenomenon has significant implic ations for the adsorption processes occurring in biological systems.