Journal
EUROPEAN PHYSICAL JOURNAL E
Volume 46, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1140/epje/s10189-023-00373-9
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This study investigates the interaction between two charge regulating spherical macroions with dielectric interior and dissociable surface groups in a monovalent electrolyte solution. The research finds symmetry breaking transitions from symmetric to asymmetric charge distribution, resulting in annealed charge patchiness and like-charge attraction even in a univalent electrolyte.
We study the interaction between two charge regulating spherical macroions with dielectric interior and dissociable surface groups immersed in a monovalent electrolyte solution. The charge dissociation is modelled via the Frumkin-Fowler-Guggenheim isotherm, which allows for multiple adsorption equilibrium states. The interactions are derived from the solutions of the mean-field Poisson-Boltzmann type theory with charge regulation boundary conditions. For a range of conditions we find symmetry breaking transitions from symmetric to asymmetric charge distribution exhibiting annealed charge patchiness, which results in like-charge attraction even in a univalent electrolyte-thus fundamentally modifying the nature of electrostatic interactions in charge-stabilized colloidal suspensions.
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