University of Twente Student Theses


Conductivity gradient focusing by pervaporationand osmosis-induced fluxes

Oostveen, Laurens van (2007) Conductivity gradient focusing by pervaporationand osmosis-induced fluxes.

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Abstract:It is possible to perform conductivity gradient focusing (CGF) with a conductivity gradient caused by pervaporation- or osmosis-induced fluxes. This is concluded from results obtained from a theoretical exploration and the results from experiments with glass microchannels with a PDMS roof. A minimal concentration factor of 28.6 was observed at experiments that proved that pervaporation flux was created in the channels. The flow velocity that was reached was at least 5.4.10-6 m s-1. CGF experiments showed that concentrating of species with this CGF method is possible, however the created concentration peaks were instable and more study is necessary to improve the stability. Indications are found that separation with this CGF method is possible. This deserves more study. Finally it is recommended to do more study at absorption and adsorption of species in or at PDMS.
Item Type:Essay (Master)
BIOS-lab on a chip group
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:54 computer science
Programme:Computer Science MSc (60300)
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