title: Streaming current and wall dissolution over 48 h in silica nanochannels.
abstract: We present theoretical and experimental studies of the streaming current induced by a pressure-driven flow in long, straight, electrolyte-filled nanochannels. The theoretical work builds on our recent one-dimensional model of electro-osmotic and capillary flow, which self-consistently treats both the ion concentration profiles, via the nonlinear Poisson-Boltzmann equation, and the chemical reactions in the bulk electrolyte and at the solid-liquid interface. We extend this model to two dimensions and validate it against experimental data for electro-osmosis and pressure-driven flows, using eight 1-μm-wide nanochannels of heights varying from 40 nm to 2000 nm. We furthermore vary the electrolyte composition using KCl and borate salts, and the wall coating using 3-cyanopropyldimethylchlorosilane. We find good agreement between prediction and experiment using literature values for all parameters of the model, i.e., chemical reaction constants and Stern-layer capacitances. Finally, by combining model predictions with measurements over 48 h of the streaming currents, we develop a method to estimate the dissolution rate of the silica walls, typically around 0.01 mg/m(2)/h, equal to 45 pm/h or 40 nm/yr, under controlled experimental conditions.
authors.affiliation: Department of Micro- and Nanotechnology, Technical University of Denmark, Kongens Lyngby, Denmark. mathias.andersen@nanotech.dtu.dk
authors.forename: Mathias Bækbo
authors.initials: MB
authors.lastname: Andersen
authors.forename: Henrik
authors.initials: H
authors.lastname: Bruus
authors.forename: Jaydeep P
authors.initials: JP
authors.lastname: Bardhan
authors.forename: Sumita
authors.initials: S
authors.lastname: Pennathur
mesh_terms: D004563:Electrochemistry; D036103:Nanotechnology / Q000295:instrumentation*; D011312:Pressure; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D012822:Silicon Dioxide