Micro-Fluidic Flow Control Using Electroosmosis

The objective of the proposed thesis is the introduction and development of microscale particle image velocimetry (�-PIV) to study the micro-scale flow field in the electroosmotic flow, which is the flow produced by the action of an electric field on a fluid with a net charge and is created by the Zeta potential and confined in the Debye layer. This basic phenomenon in the electro-kinetic transports plays an important role on the microfluidic systems being explored today because it can be applied to a variety of MEMS devices. A noble micro-scale particle image velocimetry (�-PIV ) system has been developed for the velocity measurements using a Ar-ion laser, microscope, CCD camera and optical filters. By tracking the fluorescence images, the full- field velocity distributions have been measured in the Eulerian viewpoint. Also, the experiment has focused on finding the effects of electroosmotic forces on the micro-scale flow fields, and flow control of electroosmotic flow in micro-geometries. Using the micro-PIV techniques, electroosmotically driven flows in various microchannel configurations can be measured to examine their feasibility to use for micro-pumping and micro-valve applications.

Kim, Minjun

Texas A&M University




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