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Enhanced Saturation Coverages in Adsorption-Desorption Processes

Paul R. Van Tassel·Pascal Viot·Gilles Tarjus·Jeremy J. Ramsden·Julian Talbot
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Abstract

Many experimental studies of protein deposition on solid surfaces involve alternating adsorption/desorption steps. In this paper, we investigate the effect of a desorption step (separating two adsorption steps) on the kinetics, the adsorbed-layer structure, and the saturation density. Our theoretical approach involves a density expansion of the pair distribution function and an application of an interpolation formula to estimate the saturation density as a function of the density at which the desorption process commences, $ρ_1$, and the density of the depleted configuration, $ρ_2$. The theory predicts an enhancement of the saturation density compared with that of a simple, uninterrupted RSA process and a maximum in the saturation density when $ρ_2={2/3}ρ_1$. The theoretical results are in qualitative and in semi-quantitative agreement with the results of numerical simulations.

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Paul R. Van Tassel, Pascal Viot, Gilles Tarjus, Jeremy J. Ramsden, Julian Talbot. 1999-06-29. Enhanced Saturation Coverages in Adsorption-Desorption Processes. https://doi.org/10.1063/1.480715

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