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Ionogel-based light-actuated valves for controlling liquid flow in micro-fluidic manifolds

Benito-Lopez, Fernando and Byrne, Robert and Răduţă, Ana Maria and Vrana, Nihal Engin and McGuinness, Garrett and Diamond, Dermot (2010) Ionogel-based light-actuated valves for controlling liquid flow in micro-fluidic manifolds. Lab on a Chip, 10 (2). pp. 195-201. ISSN 1473-0189

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Abstract

We present the fabrication, characterisation and performance of four novel ionic liquid polymer gels (ionogels) as photo-actuated valves incorporated into micro-fluidic manifolds. The ionogels incorporate benzospiropyran units and phosphonium-based ionic liquids. Each ionogel is photo-polymerised in situ in the channels of a poly(methyl methacrylate) micro-fluidic device, generating a manifold incorporating four different micro-valves. The valves are actuated by simply applying localised white light irradiation, meaning that no physical contact between the actuation impulse (light) and the valve structure is required. Through variation of the composition of the ionogels, each of the micro-valves can be tuned to open at different times under similar illumination conditions. Therefore, flows through the manifold can be independently controlled by a single light source. At present, the contraction process to open the channel is relatively rapid (seconds) while the recovery (expansion) process to re-close the channel is relatively slow (minutes), meaning that the valve, in its current form, is better suited for single-actuation events.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:micro-fluidic device; ionic liquids; spirobenzopyran; photoresponsive polymer; micro-valve; photoactuation;
Subjects:Engineering > Materials
Engineering > Systems engineering
Physical Sciences > Nanotechnology
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > Materials Processing Research Centre (MPRC)
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:Royal Society of Chemistry
Official URL:http://dx.doi.org/10.1039/b914709h
Copyright Information:© Royal Society of Chemistry 2010
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Irish Research Council for Science Engineering and Technology, Science Foundation Ireland, SFI grant 07/CE/I1147; IRCSET fellowship number 2089; EU FP6 project contract number MEST-CT-2005-020621
ID Code:15030
Deposited On:02 Dec 2009 17:33 by Fernando Benito-Lopez. Last Modified 11 Nov 2010 04:02

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