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Incorporation of acrylate based spiropyran monoliths in micro-fluidic devices for photo-controlled electroosmotic flow

Silvia, scarmagnani and Zarah, Walsh and Benito-Lopez, Fernando and Mirek, Macka and Brett, Paull and Diamond, Dermot (2010) Incorporation of acrylate based spiropyran monoliths in micro-fluidic devices for photo-controlled electroosmotic flow. Advances in Science and Technology, 76 . pp. 100-105. ISSN 1662-0356

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Abstract

Spiropyran photochromic compounds can be switched using light exposure between a non-polar spiro form (SP) and a zwitterionic merocyanine form (MC) that is subject to protonation (MC-H+). It has recently been demonstrated by Walsh et al. that, under acidic conditions, electroosmotic flow (EOF) generated in vinyl based spiropyran monoliths can be modulated using light irradiation. In this paper, we report a spiropyran-modified acrylate based monolith which is particularly sensitive to protonation in the MC form, producing a positively charged surface that converts to the unpolar SP form by exposure to white light. When the MC-H+ form is dominant, it produces a charged surface which enables a relatively high flow rate (up to 1.6 μl/min) to be generated under electroosmotic conditions. Upon exposure to white light, the concentration of MC-H+ decreases due to the photo-conversion to the uncharged SP form, with up to 20% reduction of the EOF. The process is reversible, and removal of the light source results in a flow increase back to the original rate. The ability to alter flow rates in micro-fluidic channels using light has very significant implications, as it could dramatically simplify the manner in which micro-flow systems are controlled.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:beads; spiropyran; EOF
Subjects:Biological Sciences > Microfluidics
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Publisher:Trans Tech Publications Ltd.
Official URL:http://www.scientific.net/AST.76.100
Copyright Information:© 2010 Trans Tech Publications Ltd.
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland under grant 07/CE/I1147 , SFI 03/IN.3/1361, SFI 07/RPF/MASF812, the Irish Separation Science Cluster Award (Grant Number 08/SRC/B1412), Marie Curie Excellence Grants and Funding (MEXT-CT-2004-014361)
ID Code:16221
Deposited On:24 May 2011 14:06 by Fernando Benito-Lopez. Last Modified 31 May 2011 10:06

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