Schizophrenie Molecules and Materials with Multiple Personalities - How Materials Science could Revolutionise How we do Chemical Sensing

Abstract

Molecular photoswitches like spiropyrans derivatives offer exciting possibilities for the development of analytical platforms incorporating photo-responsive materials for functions such as light-activated guest uptake and release and optical reporting on status (passive form, free active form, guest bound to active form). In particular, these switchable materials hold tremendous promise for microflow-systems, in view of the fact that their behaviour can be controlled and interrogated remotely using light from LEDs, without the need for direct physical contact. We demonstrate the immobilisation of these materials on microbeads which can be incorporated into a microflow system to facilitate photoswitchable guest uptake and release. We also introduce novel hybrid materials based on spiropyrans derivatives grafted onto a polymer backbone which, in the presence of an ionic liquid, produces a gel-like material capable of significant photoactuation behaviour. We demonstrate how this material can be incorporated into microfluidic platforms to produce valve-like structures capable of controlling liquid movement using light.

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Acknowledgments

Authors would like to thank Science Foundation Ireland for continued support, under grants 07/CE/L1147 (CLARITY) and 07/RFP/MASF812. FBL would like to thank the Irish Research Council for Science, Engineering and Technology (IRCSET) fellowship number 2089. RB would like to thank Dr. Ekaterina Izgorodina for her helpful discussions on theoretical calculations.

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Correspondence to Robert Byrne.

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Byrne, R., Scaramagnani, S., Radu, A. et al. Schizophrenie Molecules and Materials with Multiple Personalities - How Materials Science could Revolutionise How we do Chemical Sensing. MRS Online Proceedings Library 1190, 0801 (2009). https://doi.org/10.1557/PROC-1190-NN08-01

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