Overcharging and Free Energy Barriers for Equally Charged Surfaces Immersed in Salt Solutions.

ABSTRACT: The stability of dispersions containing charged particles may obviously be regulated by salt. In some systems, the effective charge, as measured by the potential some small distance away from the particles, can have a sign opposite to the bare surface charge. If charge reversal takes place, there is typically a salt concentration regime within which colloidal stability increases with added salt. These experimental findings on dispersions have been corroborated by atomic force microscopy investigations, where an attraction is found at short separations. This attraction is stronger than expected from standard DLVO theory, and there has been considerable debate concerning its origin. In this work, we use simple coarse-grained models of these systems, where the bare surfaces carry a uniform ch

SUBMITTER: Stenberg S 

PROVIDER: S-EPMC8675215 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature