ELECTRICAL DOUBLE-LAYER INTERACTION BETWEEN DISSIMILAR SPHERICAL COLLOIDAL PARTICLES AND BETWEEN A SPHERE AND A PLATE - NONLINEAR POISSON-BOLTZMANN THEORY

Citation
J. Stankovich et Sl. Carnie, ELECTRICAL DOUBLE-LAYER INTERACTION BETWEEN DISSIMILAR SPHERICAL COLLOIDAL PARTICLES AND BETWEEN A SPHERE AND A PLATE - NONLINEAR POISSON-BOLTZMANN THEORY, Langmuir, 12(6), 1996, pp. 1453-1461
Citations number
29
Categorie Soggetti
Chemistry Physical
Journal title
ISSN journal
07437463
Volume
12
Issue
6
Year of publication
1996
Pages
1453 - 1461
Database
ISI
SICI code
0743-7463(1996)12:6<1453:EDIBDS>2.0.ZU;2-7
Abstract
Recently the double layer forces and interaction free energies between spherical colloidal particles, according to the Poisson-Boltzmann equ ation, have been accurately calculated by us and others. In this paper we conclude our investigations in this area by extending the calculat ion of double layer interactions to unequal spherical particles. We al so consider the case of a sphere and a plate, a geometry relevant to a tomic force microscope measurements when a colloidal particle is attac hed to the cantilever tip. We compare the results against those of the linearized Poisson-Boltzmann equation and the Deryaguin approximation over a wide range of conditions. The Deryaguin approximation is found to be highly accurate for the force in sphere/plate geometry and acce ptably so for dissimilar spheres under typical colloidal conditions. W e conclude with comments on the double layer forces acting on a bare a tomic force microscope tip.