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Photoreversible ion-binding using spiropyran modified silica microbeads
journal contribution
posted on 2023-05-17, 06:57 authored by Scarmagnani, S, Slater, S, Benito-Lopez, F, Diamond, D, Walsh, Z, Brett PaullBrett Paull, Miroslav MackaMiroslav MackaIn this paper, we report the covalent immobilisation of spiropyran on silica microbeads of 5 �m 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 times 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.
History
Publication title
International Journal of NanomanufacturingVolume
5Issue
1-2Pagination
38-52ISSN
1746-9392Department/School
School of Natural SciencesPublisher
Inderscience PublishersPlace of publication
United KingdomRepository Status
- Restricted