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Reversible Photoreduction as a Trigger for Photoresponsive Gels

Draper, ER; Schweins, R; Akhtar, R; Groves, P; Chechik, V; Zwijnenburg, MA; Adams, DJ; (2016) Reversible Photoreduction as a Trigger for Photoresponsive Gels. Chemistry of Materials , 28 (17) pp. 6336-6341. 10.1021/acs.chemmater.6b02677. Green open access

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Abstract

We present here a new type of photoresponsive, reversible low molecular weight gel. All previous examples rely on a photoisomerisation, ring-closing or dimerization. We show that photoreduction of a perylene bisimide gelator results in the formation of a stable radical anion. The formation of the radical anion results in a change in the packing of the perylene bisimides in the self-assembled aggregates, leading to a change in fibrous network and an increase in the rheological properties of the gels. An increase in the rheological properties is extremely rare for a photoresponsive gel; normally, irradiation results in a gel-to-sol transition, and the gel falling apart. As the radical anion decays, which takes several hours in air, the original gel properties are restored. This photoreduction can be cycled many times. Finally, we show that the mechanical properties are different between irradiated and nonirradiated sections in a patterned gel.

Type: Article
Title: Reversible Photoreduction as a Trigger for Photoresponsive Gels
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acs.chemmater.6b02677
Publisher version: http://doi.org/10.1021/acs.chemmater.6b02677
Language: English
Additional information: Copyright © 2016 American Chemical Society. ACS AuthorChoice - This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Physical, Materials Science, Multidisciplinary, Chemistry, Materials Science, 3,4,9,10-PERYLENEDIIMIDE RADICAL-ANIONS, HAIRPIN PEPTIDE HYDROGELS, PERYLENE BISIMIDE, GELATORS, HYDROLYSIS, DIANION, FILMS, WATER, DYES
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1513243
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