title: Induced-Charge Capacitive Deionization: The Electrokinetic Response of a Porous Particle to an External Electric Field.
abstract: We demonstrate the phenomenon of induced-charge capacitive deionization that occurs around a porous and conducting particle immersed in an electrolyte, under the action of an external electric field. The external electric field induces an electric dipole in the porous particle, leading to its capacitive charging by both cations and anions at opposite poles. This regime is characterized by a long charging time, which results in significant changes in salt concentration in the electrically neutral bulk, on the scale of the particle. We qualitatively demonstrate the effect of advection on the spatiotemporal concentration field, which, through diffusiophoresis, may introduce corrections to the electrophoretic mobility of such particles.
authors.affiliation: Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
authors.forename: S
authors.initials: S
authors.lastname: Rubin
authors.affiliation: Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
authors.forename: M E
authors.initials: ME
authors.lastname: Suss
authors.affiliation: Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA Leeuwarden, The Netherlands.
authors.forename: P M
authors.initials: PM
authors.lastname: Biesheuvel
authors.affiliation: Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
authors.forename: M
authors.initials: M
authors.lastname: Bercovici