title: Electrohydrodynamic removal of non-specific colloidal adsorption at electrode interfaces.
abstract: This communication reports the use of an electrohydrodynamic surface shear force to selectively manipulate colloid-surface interactions. We demonstrate the selection of strongly (specifically) bound biomolecule-functionalized colloidal beads over more weakly (non-specifically) bound beads using a tuneable alternating current electrohydrodynamic (ac-EHD) force, which drives lateral fluid motion within a few nanometers of an electrode surface. By externally "tuning" the strength of the ac-EHD force, we demonstrate a significant enhancement of capture efficiency for specifically bound colloids, along with a removal of the adsorption of non-specific colloidal beads - a process which may be observed in real-time.
authors.affiliation: Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Corner of College and Coopers Roads, Brisbane, QLD 4072, Australia.
authors.forename: Sakandar
authors.initials: S
authors.lastname: Rauf
authors.forename: Muhammad J A
authors.initials: MJ
authors.lastname: Shiddiky
authors.forename: Matt
authors.initials: M
authors.lastname: Trau
mesh_terms: D000327:Adsorption; D003102:Colloids / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D057446:Hydrodynamics; D008839:Microelectrodes; D013499:Surface Properties
chemical_list: D003102:Colloids