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Electroosmotic Pumps with Frits Synthesized from Potassium Silicate
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-2773-5096
2015 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 10, no 12, p. e0144065-Article in journal (Refereed) Published
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Text
Abstract [en]

Electroosmotic pumps employing silica frits synthesized from potassium silicate as a stationary phase show strong electroosmotic flow velocity and resistance to pressure-driven flow. We characterize these pumps and measure an electroosmotic mobility of 2.5x10(-8) m(2)/V s and hydrodynamic resistance per unit length of 70 x10(17) Pa s/m(4) with a standard deviation of less than 2% even when varying the amount of water used in the potassium silicate mixture. Furthermore, we demonstrate the simple integration of these pumps into a proofof- concept PDMS lab-on-a-chip device fabricated from a 3D-printed template.

Place, publisher, year, edition, pages
Public Library of Science , 2015. Vol. 10, no 12, p. e0144065-
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-123756DOI: 10.1371/journal.pone.0144065ISI: 000365926300154PubMedID: 26629907OAI: oai:DiVA.org:liu-123756DiVA, id: diva2:892976
Note

Funding Agencies|Vetenskapsradet [2007-3983, 2008-7537, 2011-6404]

Available from: 2016-01-11 Created: 2016-01-11 Last updated: 2018-03-20Bibliographically approved
In thesis
1. Electroosmotic pumps with electrochemically active electrodes
Open this publication in new window or tab >>Electroosmotic pumps with electrochemically active electrodes
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Electrokinetic phenomena, motion caused by an applied electric field, can be used to separate molecules based on charge as in capillary electrophoresis, or pump liquids with electroosmosis. As microfluidic devices are becoming more advanced, involving multiple stages (sequential reactions) and requiring smaller amounts of reagent, the demand for precise fluid control and integrated electrodes increases. One of the main reasons for developing lab-on-a-chip devices is the realization of decentralized diagnostics, allowing patients to be monitored without going to a hospital or diagnosed in situations where healthcare infrastructure is not available.

The first paper of this thesis investigates the differences in characteristics between an electroosmotic pump with metal electrodes and one using electrochemically active polymer electrodes. With metal electrodes reactions normally take place at the metal/electrolyte interface where the electrolyte or species therein are either reduced or oxidized to maintain an electric current. For water-based electrolytes the electrolysis of water produces pH altering species and gas, which can interfere with microfluidic systems. As electrochemically active electrodes can themselves be reduced or oxidized, the amount of undesired reactions at the polymer/electrolyte interface can be significantly decreased. The second and third papers investigate the use of porous potassium monoliths as electroosmotic pumps in microfluidic devices using electrochemically active electrodes. Porous potassium silicate monoliths were created inside fused silica capillaries in order to increase the pumps resistance to pressure driven flow. Potassium silicate structures without a fused silica capillary as a scaffold were produced in molds of polydimethylsiloxane. Asymmetric pumping properties of these stand-alone monolith was sometimes observed. Monoliths were produced in conical molds in an attempt to increase the asymmetric behavior.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2018. p. 59
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1923
National Category
Other Chemical Engineering
Identifiers
urn:nbn:se:liu:diva-145726 (URN)10.3384/diss.diva-145726 (DOI)9789176853351 (ISBN)
Public defence
2018-04-13, Planck, Fysikhuset, Campus Valla, Linköping, 10:15 (English)
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Supervisors
Available from: 2018-03-20 Created: 2018-03-20 Last updated: 2018-03-20Bibliographically approved

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