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Electro Osmosis Effect for Ionic Channel Control

Electro Osmosis Effect for Ionic Channel Control. Background information:. 1. transport phenomenon in nanofludics ——electro-osmosis 2. physics of semiconductor. Electrostatics in liquids.

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Electro Osmosis Effect for Ionic Channel Control

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  1. Electro Osmosis Effect for Ionic Channel Control

  2. Background information: 1. transport phenomenon in nanofludics ——electro-osmosis 2. physics of semiconductor

  3. Electrostatics in liquids • Surface charge of a solid in a liquid → an oppositely charged region → EDL

  4. Electro-osmosis • A charged surface • A liquid • An electric field (parallel) • Viscous interactions Liquid movement adjacent to the wall

  5. Potential and velocity of E.O.

  6. Moving on from E.O. to semiconductor

  7. Physical characteristics of semiconductors Four valence electrons Silicon (crystalline) Diamond lattice Extremely strong bonds Valence band Discrete energy bands Conduction band

  8. How conduction occur in a semiconductor • At “normal” temperatures, the conduction band is almost empty and the valence band is almost full. • The occupied states lie near the edge of the conduction band. • There are numerous unoccupied states close to the occupied level. • Electrons can reach a higher level by an almost continuous process. • When connected to an electric field, the conduction electrons can be treated as electrons in metals.

  9. Future Work • Simulation with COMSOL • Nano channels made of Silicon • Model and control the ionic flow across the nano-sized channels

  10. THANK YOU

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