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Surface directed electrokinetic flows in microfluidic devices
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Text
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Title
Surface directed electrokinetic flows in microfluidic devices
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ETD_2097
Identifier
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.000051839
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eng
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theses
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Topic
Mechanical and Aerospace Engineering
Subject
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(authority = ETD-LCSH)
Topic
Electrokinetics
Subject
(ID = SBJ-3);
(authority = ETD-LCSH)
Topic
Microfluidics
Abstract
Electroosmotic flow control in microfluidic devices is an important and challenging problem, as electroosmosis directly influences separation efficiencies in lab-on-chip applications. In this study, a non-mechanical passive flow directing method is presented for electrokinetically driven flow. Due to the high surface-area-to-volume (SA/V) ratio, surface properties dominate the flow in microfluidic channels. For electrokinetically driven flows, the main surface property affecting electroosmotic flows is the surface ζ potential, which is related to the effective surface charge density. By changing the effective surface charge density, the electroosmotic flow rates of charged species can be controlled in microfluidic channels. In this work, to change the effective surface charge density, surfaces were chemically modified with –Br, –NH2 and –CH3 functional groups by ‘click’ chemistry. Since these functional surface layers are integrated within model glass microfluidic devices prepared by standard microfabrication procedures, the first step was to investigate the stability of the adherent surface layers to a variety of microfabrication conditions. A model “Y” shaped glass microfluidic device was developed. One leg of this model microfluidic device was selectively chemically modified to alter the ζ potential and thereby increase or decrease the electroosmotic flow with respect to rest of the device. Electroosmotic flow is visualized by using marker dyes under a fluorescent microscope. In addition, experiments were validated by using the CFD code in COMSOL. The experiments concluded that the surface layers are stable to a variety of conditions including a wide pH range (pH 3 – pH 11), solvent exposure, acid and base exposure, and UV light. Extreme conditions such as a piranha solution or oxidative plasma degrade the surface layers. Electrokinetic flow experiments show that depending on the charge of a species the electroosmotic flow is preferentially directed as a function of the ζ potential in the microfluidic channels.
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electronic resource
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xiii, 81 p. : ill.
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M.S.
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Includes bibliographical references (p. 78-81)
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by Mehmet Basar Karacor
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Karacor
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Mehmet Basar
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1982-
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author
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Mehmet Basar Karacor
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Bottega
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William
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chair
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Advisory Committee
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William J Bottega
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(type = family)
Prakash
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Shaurya
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internal member
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Advisory Committee
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Shaurya Prakash
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(type = family)
Diez-Garias
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Javier
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internal member
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Advisory Committee
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Javier Diez-Garias
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Bagchi
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Advisory Committee
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Prosenjit Bagchi
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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school
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2009
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2009-10
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xx
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Rutgers University Electronic Theses and Dissertations
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ETD
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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NjNbRU
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doi:10.7282/T3FJ2GZR
Genre
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ETD graduate
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Rights
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The author owns the copyright to this work
Copyright
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Copyright protected
Notice
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Availability
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Open
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Permission or license
Note
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Karacor
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Mehmet
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Mehmet Karacor
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Rutgers University. Graduate School - New Brunswick
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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9697280
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