2001/04/30 by Rene Messina, René Messina · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Electrostatics and Colloid Interactions #Material Dynamics and Properties #Pickering emulsions and particle stabilization #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1016/s0378-4371(02)00560-5
published as Physica A, VOL. 308, p. 59 (2002) · 24 pages, 12 (main) figures (28 EPS files). To appear in Physica A
arxiv created 2002/04/22 · openalex publication_date 2002/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report the coupled effects of macroion charge discretization and counterion valence in the primitive model for spherical colloids. Instead of considering a uniformly charged surface, as it is traditionally done, we consider a more realistic situation where discrete monovalent microscopic charges are randomly distributed over the sphere. Monovalent or multivalent counterions ensure global electroneutrality. We use molecular dynamics simulations to study these effects at the ground state and for finite temperature. The ground state analysis concerns the counterion structure and charge inversion. Results are discussed in terms of simple analytical models. For finite temperature, strong and weak Coulomb couplings are treated. In this situation of finite temperature, we considered and discussed the phenomena of ionic pairing (pinning) and unpairing (unpinning).