Elsevier

Colloids and Surfaces

Volume 41, 1989, Pages 245-254
Colloids and Surfaces

Divalent cations can increase cell—substrate repulsion at small distances

https://doi.org/10.1016/0166-6622(89)80056-3Get rights and content

Abstract

The electrostatic interaction between a cell under charge regulation and a solid surface with constant potential is considered. With the ionizable surface groups of the adhesion cell treated as a self-consistent function of the electrostatic potential, numerical examples are given to illustrate the non-linear Poisson—Boltzmann equation. The results show that the presence of divalent cations in the suspension medium will not always reduce the repulsion force during the whole adhesion period. The distance at which the effect of divalent cations exerted on the interaction force changes from positive (reducing the repulsion force) to negative (increasing the repulsion force) is defined as the critical separation distance.

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