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Flow restrictor silicon membrane microvalve actuated by optically controlled paraffin phase transition
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Microsystems Technology.
2014 (English)In: Journal of Micromechanics and Microengineering, ISSN 0960-1317, E-ISSN 1361-6439, Vol. 24, no 8, 084003- p.Article in journal (Refereed) Published
Abstract [en]

Restrictor valves allow proportional control of fluid flow but are rarely integrated in microfluidic systems. In this study, an optically actuated silicon membrane restrictor microvalve is demonstrated. Its actuation is based on the phase transition of paraffin, using a paraffin wax mixed with a suitable concentration of optically absorbing nanographite particles. Backing up the membrane with oil (the melted paraffin) allows for a compliant yet strong contact to the valve seat, which enables handling of high pressures. At flow rates up to 30 mu L min(-1) and at a pressure of 2 bars, the valve can successfully be closed and control the flow level by restriction. The use of this paraffin composite as an adhesive layer sandwiched between the silicon valve and glass eases fabrication. This type of restrictor valve is best suited for high pressure, low volume flow silicon-based nanofluidic systems.

Place, publisher, year, edition, pages
2014. Vol. 24, no 8, 084003- p.
Keyword [en]
microfluidic, silicon-on-insulator, paraffin, wafer bonding
National Category
Other Engineering and Technologies
URN: urn:nbn:se:uu:diva-237632DOI: 10.1088/0960-1317/24/8/084003ISI: 000343413400004OAI: oai:DiVA.org:uu-237632DiVA: diva2:769589
24th MicroMechanics and Microsystems Europe Conference (MME), SEP 01-04, 2013, Espoo, FINLAND
Available from: 2014-12-08 Created: 2014-12-03 Last updated: 2014-12-08Bibliographically approved

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