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TitleIn-situ sol-gel modification of pdms electrophoretic analytical devices
Publication TypeConference Paper
Year of Publication2010
AuthorsHoek, I., Bubendorfer A., Kemmitt T., and Arnold W.M.
Conference Name14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010
Date Published2010
KeywordsAnalytic equipment, Coatings, Electroosmosis, Electroosmotic flow, Hydrolysis and condensation, Microchannels, PDMS microchannels, Polydimethylsiloxane PDMS, Precursor solutions, Silica, Silicones, Sol-gel deposition, Sol-gel process, Sol-gels, Surface treatment, Tetraethyl orthosilicates, Two-step process
AbstractThis paper reports on a rapid new method for in-situ sol-gel deposition of silica layers in PDMS microchannels. A two-step process is used; first allowing TEOS to diffuse briefly into the channel, followed by acid catalysed hydrolysis and condensation. The silica coating results in an increased and stabilised electroosmotic flow. With this novel method there is no need for pretreatment of the microchannels or time consuming oligomerisation of the precursor solution. The silica coating combines the benefits of glass, such as hydrophilicity and a stable high electroosmotic flow, with the advantages of rapid microdevice prototyping offered by PDMS.

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