Show simple item record

dc.contributor.authorSaini, Rakesh
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2014-06-11 10:58:11.557en
dc.date.accessioned2014-06-11T19:51:14Z
dc.date.available2015-08-02T08:00:20Z
dc.date.issued2014-06-11
dc.identifier.urihttp://hdl.handle.net/1974/12230
dc.descriptionThesis (Master, Chemical Engineering) -- Queen's University, 2014-06-11 10:58:11.557en
dc.description.abstractNowadays, there are various electrokinetic phenomena which are utilized in a wide range of applications, ranging from microfluidics and colloid and interface science to electrochemistry. However, even after 200 years of research on electrokinetic phenomena, there are still open questions with respect to fundamental understanding. The focus of this thesis is on three different phenomena, i.e., streaming potential, streaming current and electroosmosis. Hence, the thesis is divided in two parts: The first part focuses on the applicability of the classical Helmholtz-Smoluchowski theory on streaming potential and streaming current measurements of poly(methyl methacrylate) (PMMA) wafers, to infer the zeta potential of this substrate in contact with liquids of defined pH and ionic strength. In detail, we perform electrical impedance spectroscopy measurements to infer the electrical resistance in a PMMA microchannel and derive novel correlations for the electrokinetic characterization of the substrate. We conclude that convection can have a significant impact on the electrical double layer configuration which is reflected by changes in the surfaces conductivity. The second part of the thesis is concerned with electroosmotic flows in porous substrates where we develop a phenomenological correlation which is based on dimensional reasoning. A large set of experiments is carried out using a relatively simple and cost-effective setup including different sintered packed beds of borosilicate microspheres. A centre-of-mass model of the experimental setup allows for the interpretation of various effects. Streaming current measurements result in a correlation for the zeta potential of borosilicate depending on ionic strength and pH of the liquid. Finally, a quantitative expression for electroosmotic flow in packed beds of granular material is derived from the experiments. This correlation can be employed with other materials as well.en_US
dc.languageenen
dc.language.isoenen_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectStreaming potentialen_US
dc.subjectPorousen_US
dc.subjectStreaming currenten_US
dc.subjectPlanaren_US
dc.subjectElectroosmosisen_US
dc.titleExperimental investigation of electrokinetic phenomena in planar and porous substratesen_US
dc.typeThesisen_US
dc.description.restricted-thesisThe thesis project is sponsored by DuPont Canada. So we would like to restrict the thesis for nearly 3 months until we submit the report to them.en
dc.description.degreeMasteren
dc.contributor.supervisorBarz, Dominik P. J.en
dc.contributor.departmentChemical Engineeringen
dc.embargo.terms1825en


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record