Velocity measurements inside the diffuse electric double layer in electro-osmotic flow
- 24 July 2006
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 89 (4) , 044103
Abstract
Electro-osmotic flow (EOF), where ions in the electric double layer (EDL) next to the wall are driven by an electric field, is commonly used in microfluidics. Experimental observations of the velocity deficit in the EDL within 250nm of the wall in EOF of a monovalent aqueous electrolyte solution are reported and validated by analytical predictions. Unlike other techniques for probing the EDL in quiescent solutions, this nonintrusive time-resolved technique is suitable for quantifying changes in wall potential in flowing electrolyte solutions, e.g., due to surface adsorption, in a microfluidic device.Keywords
This publication has 11 references indexed in Scilit:
- Electro-osmotic flow in two-dimensional charged micro- and nanochannelsJournal of Fluid Mechanics, 2005
- Impact of hindered Brownian diffusion on the accuracy of particle-image velocimetry using evanescent-wave illuminationExperiments in Fluids, 2004
- Surface Interactions during Polyelectrolyte Multilayer Buildup. 1. Interactions and Layer Structure in Dilute Electrolyte SolutionsLangmuir, 2004
- An experimental study of electro-osmotic flow in rectangular microchannelsJournal of Fluid Mechanics, 2004
- Effect of multivalent ions on electroosmotic flow in micro‐ and nanochannelsElectrophoresis, 2003
- Conditions for Similitude between the Fluid Velocity and Electric Field in Electroosmotic FlowAnalytical Chemistry, 2000
- Mapping Local Electrostatic Forces with the Atomic Force MicroscopeLangmuir, 1997
- Treating Electrostatic Shielding at the Surface of Silica as Discrete Siloxide·Cation InteractionsJournal of the American Chemical Society, 1997
- Measuring electrostatic, van der Waals, and hydration forces in electrolyte solutions with an atomic force microscopeBiophysical Journal, 1991
- Slow viscous motion of a sphere parallel to a plane wall—II Couette flowChemical Engineering Science, 1967