title: Electrochemical charge of silica surfaces at high ionic strength in narrow channels.
abstract: We present a theoretical framework to calculate the electrochemical charge on silica surfaces in contact with high-ionic-strength solutions in narrow channels. Analytical results indicate that the contribution of the adsorbed metal cations to the total surface charge is not negligible when the salinity is larger than 1 mM. The electrical triple-layer model is proved much better than other models for high ionic strength. The charge regulation caused by the double-layer overlap in narrow channels will reduce the surface charge density but increase the zeta potential on silica surfaces.
authors.affiliation: Computational Earth Sciences Group (EES-16), Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. mwang@lanl.gov
authors.forename: Moran
authors.initials: M
authors.lastname: Wang
authors.forename: André
authors.initials: A
authors.lastname: Revil
mesh_terms: D004563:Electrochemistry; D008956:Models, Chemical; D009994:Osmolar Concentration; D012822:Silicon Dioxide / Q000737:chemistry*; D055672:Static Electricity; D013499:Surface Properties
chemical_list: D012822:Silicon Dioxide