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마이크로 채널에서 전기삼투를 이용한 Couette 유동의 생성실험
안채혁(Chae Hyuck Ahn),조병래(Byung Rae Cho),유정열(Jung Yul Yoo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Flow control in a micro-channel is one of the most important issues in the field of microfluidics. Although many studies have suggested ideas to induce Couette-type flow in a microchannel by changing geometry, they have some difficulties of fabrication or analysis. In the present study, linear velocity profile (Couette flow) was induced by using electro-osmosis technique. This electroosmotic Couette flow could be simply realized by using different materials (glass and PDMS) as the microchannel wall. Velocity difference between two channel walls was induced due to the difference between zeta-potentials of respective materials. The velocity inside a microchannel was measured using a micro-PIV analysis. This new method can be used to analyze and control the movement of adhesive cells which have been known to react to shear stress.