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Photoreversible ion-binding using spiropyran modified silica microbeads


Scarmagnani, S and Slater, S and Benito-Lopez, F and Diamond, D and Walsh, Z and Paull, B and Macka, M, Photoreversible ion-binding using spiropyran modified silica microbeads, International Journal of Nanomanufacturing, 5, (1-2) pp. 38-52. ISSN 1746-9392 (2010) [Refereed Article]

DOI: doi:10.1504/IJNM.2010.029921


In 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.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Paull, B (Professor Brett Paull)
UTAS Author:Macka, M (Professor Mirek Macka)
ID Code:71633
Year Published:2010
Deposited By:Research Division
Deposited On:2011-07-26
Last Modified:2011-08-18

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