Testcharge theory for the planar electric double layer
Abstract
A new model for the ion distribution near a charged surface is presented, based on the response of the ions to the presence of a single test particle. Near an infinite planar surface this model produces the exact density profile, in the limits of weak and strong coupling, which correspond to zero and infinite values of the dimensionless coupling parameter; at intermediate values of the coupling parameter the model produces approximate density profiles that agree semiquantitatively with recent MonteCarlo simulations. The model also sheds light on the occurrence of a distancedependent crossover from exponential to algebraic decay, even at very large values of the dimensionless coupling parameter.
 Publication:

APS March Meeting Abstracts
 Pub Date:
 March 2004
 Bibcode:
 2004APS..MARB31011B