387476 Electrokinetic Colloid and Micro-Vortex Dynamics in Heterogeneous Nano-Slot Devices

Monday, November 17, 2014: 2:10 PM
Marquis Ballroom D (Marriott Marquis Atlanta)
Gilad Yossifon1, Neta Leibowitz2, Yoav Green1, Jarrod Schiffbauer3 and Sinwook Park1, (1)Mechanical Enginnering, Technion - Israel Institute of Technlogy, Technion City, Israel, (2)Mechanical Engineering, Technion, Haifa, Israel, (3)Mechanical Engineering, Technion--Israeli Institute of Technology, Haifa, Israel

Understanding the electrokinetic interaction between colloidal particles and a nanochannel is of particular interest in the field of micro- and nano-fluidics and may play an important role in biomolecular detection. At relatively high-voltages, wherein concentration-polarization (CP) and electro-convective vortices emerge, the interaction complexity is further increased. Here we study the colloid dynamics in the vicinity of a heterogeneous nanoslot device wherein field-focusing effects and geometrically modulated interface significantly affect the CP and vortices due to both Dukhin’s electro-osmosis of the 2nd kind and Rubinstein’s electro-convective instability. In particular, trapping of colloids at the nanoslot entrance and their accumulation due field-focusing gradient effects within the diffusion layers is addressed.

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See more of this Session: Electrokinetics for Self-Assembly
See more of this Group/Topical: 2014 Annual Meeting of the AES Electrophoresis Society