title: Electrostatic correlation force of discretely charged membranes.
abstract: The total force between two like charged surfaces is investigated as a function of counterion concentration in aqueous solution and surfaces distance of separation. A smooth and a discrete density of surface charge sigma(s) lead to differences in the force distance curve at high sigma(s), which are negligible for low surface charge. The total force per unit area with divalent counterions is an oscillating function of sigma(s). At fixed surfaces separation and region of attraction (increasing sigma(s)), there is a variation in its strength that results from a competition between the ideal kinetic and ion-ion correlation force components as predicted from the anisotropic hypernetted chain approximation.
authors.affiliation: Departamento de Física, Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional, Apartado Postal 14-740, México Distrito Federal, Mexico.
authors.forename: O
authors.initials: O
authors.lastname: González-Amezcua
authors.forename: M
authors.initials: M
authors.lastname: Hernández-Contreras
authors.forename: P
authors.initials: P
authors.lastname: Pincus
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D002462:Cell Membrane / Q000378:metabolism*; D004247:DNA / Q000737:chemistry; D004573:Electrolytes; D007477:Ions; D007700:Kinetics; D008566:Membranes / Q000737:chemistry*; D015233:Models, Statistical; D009991:Oscillometry; D011312:Pressure; D055672:Static Electricity; D013499:Surface Properties; D013816:Thermodynamics
chemical_list: D004573:Electrolytes; D007477:Ions; D004247:DNA