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Maximizing fluid delivered by bubble free electroosmotic pump

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TitleInfo
Title
Maximizing fluid delivered by bubble free electroosmotic pump
Name (type = personal)
NamePart (type = family)
Tawfik
NamePart (type = given)
Mena E.
NamePart (type = date)
1985-
DisplayForm
Mena E. Tawfik
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Diez
NamePart (type = given)
Javier
DisplayForm
Javier Diez
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
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school
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Text
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theses
OriginInfo
DateCreated (qualifier = exact)
2017
DateOther (qualifier = exact); (type = degree)
2017-01
CopyrightDate (encoding = w3cdtf); (qualifier = exact)
2017
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
In generating high electroosmotic flows (EO) for use in microfluidic pumps, a limiting factor is faradaic reactions which are more pronounced at high electric fields. These reactions lead to bubble generation at the electrodes and pump efficiency reduction. The time taken for gas bubbles to start forming on an electrode operates in a stagnant aqueous solution is driven by the dissolved gas mass-transfer near the electrode. This is the result of two processes that compete with one another. One adds dissolved gas molecules from the chemical reactions at the electrode surface and the other diffuses these molecules towards the bulk. Using this mechanism, a model is proposed that can predict the dissolved gas supersaturation concentration up to the onset of bubble nucleation at the electrodes (heterogeneous nucleation). Experimental measurement of the bubble onset nucleation time is incorporated within this model to calculate the critical supersaturation concentration for dissolved hydrogen and oxygen gas. The results show a strong link between the applied current density and the supersaturation concentration at the electrode surface. The gas bubble nucleation time at low current densities (low production rate) can be easily measured by monitoring the electrode surface. However at high current density, the nucleation times are too short to be accurately experimentally measured by common techniques. A new experimental technique is proposed to quantify, control and measure the bubble nucleation time at high current densities (high production rate) by alternating the applied voltage waveform. A relation is obtained that predict the onset of bubble nucleation showing an excellent agreement with the measurement. The onset of gas generation for high current density EO pumping depends on many parameters including applied voltage, working fluid and pulse duration. The onset of gas generation can be delayed and optimized for maximum volume delivered in the shortest time possible. This has been achieved through the numerical model proposed to predict the onset of gas generation during EO pumping using an optimized pulse voltage waveform. This method allows applying current densities higher than previously reported. Optimal pulse voltage waveform (OPW) are calculated based on the previous theories for different current densities and electrolyte molarity. The Electroosmotic pump performance is investigated by experimentally measuring the fluid volume displaced and flow rate.
Subject (authority = RUETD)
Topic
Mechanical and Aerospace Engineering
Subject (authority = ETD-LCSH)
Topic
Microfluidics
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_7869
PhysicalDescription
Form (authority = gmd)
electronic resource
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application/pdf
InternetMediaType
text/xml
Extent
1 online resource (xii, 70 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Mena E. Tawfik
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T3NZ8B35
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Tawfik
GivenName
Mena
MiddleName
E.
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2017-01-13 12:26:50
AssociatedEntity
Name
Mena Tawfik
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
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.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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