title: Interactions between charged lamellae in aqueous solution.
abstract: Interactions between charged surfaces in aqueous solutions, widespread in soft matter and biology, are very complex and, despite many efforts, their full explanation remains challenging. We support the idea that, in contrast to extremely small separations (d≤2  nm), where many effects, prominently those linked to the structure of liquid water, interfere, electrostatics alone rules over larger distances (d≥5  nm) at low ionic strength. We set up specially designed surface force apparatus (SFA) experiments to measure the elastic compressibility modulus of a stack of charged membranes with monovalent counterions, directly and with high precision. We demonstrate that electrostatics alone, if implemented beyond Poisson-Boltzmann theory, fully accounts for the data, nonelectrostatic contributions playing at best a minor role.
authors.affiliation: CNRS Institut Charles Sadron, 23 Rue du Loess, 67034 Strasbourg Cedex 2, France.
authors.forename: Laure
authors.initials: L
authors.lastname: Herrmann
authors.affiliation: CNRS Institut Charles Sadron, 23 Rue du Loess, 67034 Strasbourg Cedex 2, France and Department of Physics, Sejong University, Seoul 143-743, South Korea.
authors.forename: Albert
authors.initials: A
authors.lastname: Johner
authors.affiliation: CNRS Institut Charles Sadron, 23 Rue du Loess, 67034 Strasbourg Cedex 2, France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Kékicheff
mesh_terms: D008566:Membranes / Q000737:chemistry; D008567:Membranes, Artificial; D008956:Models, Chemical; D000442:Octanols / Q000737:chemistry*; D009994:Osmolar Concentration; D016012:Poisson Distribution; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D012996:Solutions; D055672:Static Electricity; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D008567:Membranes, Artificial; D000442:Octanols; D012996:Solutions; D014867:Water; D012967:Sodium Dodecyl Sulfate