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Photoreversible ion-binding using spiropyran modified silica microbeads

Scarmagnani, Silvia and Walsh , Zarah and Slater, Conor and Benito-Lopez, Fernando and Macka, Mirek and Paull, Brett and Diamond, Dermot (2010) Photoreversible ion-binding using spiropyran modified silica microbeads. International Journal of Nanomanufacturing, 5 (1/2). pp. 38-52. ISSN 1746-9392

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In this paper, we report the covalent immobilisation of spiropyran on silica microbeads of 5 μm diameter and subsequent evaluation of the photoswitchable behaviour and light-modulated ion-binding properties of the spiropyran modified silica microbeads towards a range of different metal ions. The beads can be effectively switched using light emitting diodes between a white spiropyran form (by irradiation with a white 430–760 nm light emitting diode) and a pink merocyanine form (upon irradiation with a UV light 375 nm emitting diodes) that undergoes, under exposure to certain metal ions (such as Cu2+ and Zn2+, final concentration of 7.7 × 10–4 M in ethanol solution), a further reversible spectral and colour change due to the formation of merocyanine-metal ion complexes. Furthermore, the accumulated ions can subsequently released from the beads on demand using light emitting diodes to reform the inactive spiro form. Keywords: photoreversible ion binding;

Item Type:Article (Published)
Uncontrolled Keywords:photoreversible ion binding; spiropyran; functionalised silica microbeads; adaptive material; covalent immobilisation; molecular photoswitches; light emitting diodes; LED; nanomaterials;
Subjects:Physical Sciences > Analytical chemistry
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 > National Centre for Sensor Research (NCSR)
Research Initiatives and Centres > CLARITY: The Centre for Sensor Web Technologies
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Copyright Information:Copyright © Inderscience
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland, SFI 03/IN.3/1361, SFI 07/RPF/MASF812, EC FP6, Irish Research Council for Science Engineering and Technology, IRCSET 2089
ID Code:15116
Deposited On:01 Feb 2010 11:48 by Silvia Scarmagnani. Last Modified 31 Jul 2010 04:02

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