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Electroosmotic pumps with potassium silicate frits
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.
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, The Institute of Technology.ORCID iD: 0000-0002-2773-5096
2015 (English)Manuscript (preprint) (Other academic)
Abstract [en]

Electroosmotic pumps employing potassium silicate as a stationary phase show strong electroosmotic flow velocity and resistance to pressure-driven   flow. We characterize these pumps and demonstrate their simple integration into proof-of-concept PDMS lab-on-a-chip devices fabricated from 3D-printed templates.

Place, publisher, year, edition, pages
2015.
National Category
Chemical Sciences Chemical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-119363OAI: oai:DiVA.org:liu-119363DiVA: diva2:821469
Available from: 2015-06-15 Created: 2015-06-15 Last updated: 2015-06-15Bibliographically approved
In thesis
1. Electrodes and Electrokinetic Systems for Biotechnological Applications
Open this publication in new window or tab >>Electrodes and Electrokinetic Systems for Biotechnological Applications
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Research in bioelectronics studies biological systems and materials in combination with electronic interfaces for the development of devices, e.g., for medical applications, drug and toxicity tests, and biotechnology in general. Neural implants and pacemakers are examples of products developed from this area of research. Conducting polymers such as poly(3,4-ethylenedioxythiophene) (PEDOT) bridge biology and electronics with a combination of biocompatibility, flexibility, and capability to themselves undergo redox reactions. Electrokinetics, a related branch of science, describes the motion of fluids and particles caused by the application of an electric field, and includes various separation techniques such as gel electrophoresis. Applying an electric field in a sufficiently small diameter silica capillary can cause the liquid in the capillary to move. This phenomenon, referred to as electroosmosis, plays an important role in miniaturized microfluidic systems and can be used to drive flow in a so-called electroosmotic pump.

This thesis describes research at the interface between biology, chemistry and electronics. The first two papers probe the adsorption mechanism of poly-L-lysine, often used in biotechnological applications, onto hard materials such as metals (platinum) and metal oxides (indium tin oxide). By employing a gravimetric technique, quartz crystal microgravimetry with dissipation monitoring (QCM-D) combined with electrochemistry, we studied the process by which poly-L-lysine is deposited onto two different conducting substrates under anodic conditions. We found that indium tin oxide is more suitable than platinum for anodic electrodeposition of PLL, however, the exact film deposition mechanism is not fully understood. Paper 3 demonstrates the applicability of using conducting polymers, (e.g., PEDOT) instead of platinum as electrode material in gel electrophoresis. The last paper describes the fabrication and characterization of an electroosmotic pump consisting of a potassium silicate stationary phase in a fused silica capillary and the integration of the pump into a system for use, e.g., as a bioreactor.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 47 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1682
National Category
Chemical Sciences Chemical Engineering
Identifiers
urn:nbn:se:liu:diva-119364 (URN)10.3384/diss.diva-119364 (DOI)978-91-7519-033-4 (print) (ISBN)
Public defence
2015-07-07, Planck, Fysikhuset, Campus Valla, Linköping, 10:15 (Swedish)
Opponent
Supervisors
Available from: 2015-06-15 Created: 2015-06-15 Last updated: 2015-06-15Bibliographically approved

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