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Electrolysis-reducing electrodes for electrokinetic devices
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. (Transport and Separations Group)
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology. (Transport and Separations Group)ORCID iD: 0000-0002-2773-5096
2011 (English)In: ELECTROPHORESIS, ISSN 0173-0835, Vol. 32, no 6-7, p. 784-790Article in journal (Refereed) Published
Abstract [en]

Direct current electrokinetic systems generally require Faradaic reactions to occur at a pair of electrodes to maintain an electric field in an electrolyte connecting them. The vast majority of such systems, e. g. electrophoretic separations (capillary electrophoresis) or electroosmotic pumps (EOPs), employ electrolysis of the solvent in these reactions. In many cases, the electrolytic products, such as H+ and OH- in the case of water, can negatively influence the chemical or biological species being transported or separated, and gaseous products such as O-2 and H-2 can break the electrochemical circuit in microfluidic devices. This article presents an EOP that employs the oxidation/reduction of the conjugated polymer poly(3,4-ethylenedioxythiophene), rather than electrolysis of a solvent, to drive flow in a capillary. Devices made with poly(3,4-ethylenedioxythiophene) electrodes are compared with devices made with Pt electrodes in terms of flow and local pH change at the electrodes. Furthermore, we demonstrate that flow is driven for applied potentials under 2 V, and the electrodes are stable for potentials of at least 100 V. Electrochemically active electrodes like those presented here minimize the disadvantage of integrated EOP in, e. g. lab-on-a-chip applications, and may open new possibilities, especially for battery-powered disposable point-of-care devices.

Place, publisher, year, edition, pages
John Wiley and Sons, Ltd , 2011. Vol. 32, no 6-7, p. 784-790
Keyword [en]
Conducting polymers, Electrochemical electrodes, Electroosmosis, Gas evolution, Microfluidics
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-67312DOI: 10.1002/elps.201000617ISI: 000288602000019OAI: oai:DiVA.org:liu-67312DiVA, id: diva2:409387
Available from: 2012-06-08 Created: 2011-04-08 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)
Opponent
Supervisors
Available from: 2018-03-20 Created: 2018-03-20 Last updated: 2018-03-20Bibliographically approved

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