Electrostatic interaction between chemically identical colloids

Par Arghya Majee, Max-Planck-Institut für Intelligente Systeme/Theoretische Physik IV, Universität Stuttgard, Germany

Lundi 16 Octobre, 14h, Salle des séminaires (215), 2ème étage, Bâtiment A4N

Abstract :

The interaction between two chemically identical colloidal particles dispersed in a bulk electrolyte solution as well as trapped at the interface between two immiscible electrolyte solutions will be discussed.
For the former case, the surfaces of the particles are charge-regulated. It is shown that, contrary to common assumptions, such surfaces are not necessarily equally charged and the resulting interaction can be attractive instead of repulsive [1].
For the latter case, the colloidal particles carry fixed surface charges, which can be different on both sides of the liquid-liquid interface. Within the framework of nonlinear Poisson-Boltzmann (PB) theory it turns out that, under certain circumstances, an attractive interaction between them is still possible [2], which, however, cannot be captured by using the linearized PB theory [3].

[1] A. Majee, M. Bier, and R. Podgornik, submitted.
[2] A. Majee, M. Bier, and S. Dietrich, J. Chem. Phys. 145, 064707 (2016).
[3] A. Majee, M. Bier, and S. Dietrich, J. Chem. Phys. 140, 164906 (2014).