Negative cooperativity in adsorption and adhesion of particles

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Abstract
Localized adsorption of colloid and larger particles (e.g. bacteria) onto homogenous surfaces were analyzed theoretically. A negative cooperativity was predicted by using the Monte Carlo simulation technique in a case where repulsive double‐layer interactions among charged particles occurred at the adsorbing surface (soft sphere adsorption). Hence particle adsorption kinetics as well as equilibrium surface concentrations deviated considerably from the Langmuirian model, indicating that the geometrical blocking effect was more pronounced especially for high surface concentrations of adsorbed particles and a low ionic strength of the suspension. The new adsorption isotherm derived shows that for a large adsorption constant Ka the equilibrium surface concentration is proportional to K”; “J, in contrast to the Langmuirian model where θe ∼ K‐1 a.

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