Investigation of Electroosmotic Flow in Various Microfluidic Structures

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dc.contributor.advisor Wikswo, John Peter
dc.contributor.author Diggins, Patrick
dc.date.accessioned 2010-06-15T20:03:34Z
dc.date.available 2010-06-15T20:03:34Z
dc.date.issued 2010-04
dc.identifier.uri http://hdl.handle.net/1803/4105
dc.description Highest Honors in Physics
dc.description.abstract Enclosed microfluidic devices provide excellent systems for the study of biological processes such as cell-cell, paracrine, and autocrine signaling systems. By minimizing the fluid volume within the chambers, microfluidic devices diminish the dilution of secreted products which makes the detection of the secreted products a more straightforward task. A major design problem associated with the construction of microfluidic devices for biological research is the need to provide well-controlled fluidic transportation for cells, the nutrients that the cells need, and waste removal. Most precision syringe pumps which can accurately provide low flow rates are expensive and constitute a barrier to experiment design. Electroosmotic pumps could potentially provide a valuable alternative as a low volume flow rate pumping system for many types of microfluidic devices. We have developed a poly(dimethylsiloxane) (PDMS) microfluidic device that incorporates both electroosmotic flow and pressure driven flow. The device is designed to increase the relative strength of the electroosmotic flow (EOF) component of the total flow through the use of an array of small volume parallel pumping channels which provide higher passive resistance to pressure driven flow than a larger volume single-channel EOF pump. Using a novel microfluidic instrumentation device which we call the "Micro Programmable Object Navigation Gadget" (µ-PONG), we investigate how different properties and geometries of the device affect the EOF rate.  In addition, we demonstrate that fluid flow driven by a small hydraulic pressure head can be completely canceled by an user initiated EOF in the pumping channels which are incorporated into a microfluidic device. The ability to modulate the flow and to create "stop flow" conditions in microfluidic devices is also important for biological research. en_US
dc.language.iso en_US en_US
dc.publisher Vanderbilt University. Dept. of Physics and Astronomy en_US
dc.subject Electrokinetic flow en_US
dc.subject Electroosmotic flow en_US
dc.subject Poiseuille flow en_US
dc.subject MEMS, Poly(dimethylsiloxane) en_US
dc.subject Particle imaging en_US
dc.subject.lcsh Microfluidic devices en_US
dc.subject.lcsh Microfluidics en_US
dc.subject.lcsh Fluid dynamics en_US
dc.title Investigation of Electroosmotic Flow in Various Microfluidic Structures en_US
dc.type Thesis en_US
dc.description.college College of Arts and Science en_US
dc.description.department Dept. of Physics and Astronomy en_US

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