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Spiropyran modified micro-fluidic chip channels as photonically controlled self-indicating system for metal ion accumulation and release

Benito-Lopez, Fernando and Scarmagnani, Silvia and Walsh, Zarah and Paull, Brett and Macka, Mirek and Diamond, Dermot (2009) Spiropyran modified micro-fluidic chip channels as photonically controlled self-indicating system for metal ion accumulation and release. Sensors and Actuators B: Chemical, 140 (1). pp. 295-303. ISSN 0925-4005

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Abstract

In this paper, we show how through integrating the beneficial characteristics of micro-fluidic devices and spiropyrans dyes, a simple and very innovative chip configured as an on-line photonically controlled self-indicating system for metal ion accumulation and release can be realised. The micro-fluidic device consists of five independent 94 μm depth, 150 μm width channels fabricated in polydimethylsiloxane. The spiropyran 1’-(3-carboxypropyl)-3,3’-dimethyl-6-nitrospiro-1-benzopyran-2,2’-indoline is immobilised by physical adsorption into a polydimethylsiloxane matrix and covalently on the ozone plasma activated polydimehylsiloxane micro-channel walls. When the colourless, inactive, spiropyran coating absorbs UV light it switches to the highly coloured merocyanine form, which also has an active binding site for certain metal ions. Therefore metal ion uptake can be triggered using UV light and subsequently reversed on demand by shining white light on the coloured complex, which regenerates the inactive spiropyran form, and releases the metal ion. When stock solutions of several metal ions (Ca2+, Zn2+, Hg2+, Cu2+, Co2+) are pumped independently through the five channels, different optical responses were observed for each metal, and the platform can therefore be regarded as a micro-structured device for online self-indicating metal ion complexation, accumulation and release.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Sensors;
Subjects:Engineering > Materials
Physical Sciences > Chemical detectors
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:Elsevier
Official URL:http://dx.doi.org/10.1016/j.snb.2009.03.080
Copyright Information:Copyright © 2009 Elsevier B.V.
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 03/IN3/1361, SFI 07/RPF/MASF812
ID Code:4500
Deposited On:21 Apr 2009 10:43 by Fernando Benito-Lopez. Last Modified 16 Nov 2009 17:42

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