Azobenzene-based light-responsive hydrogel system

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Azobenzene-based light-responsive hydrogel system

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dc.contributor.author Zhao, Yanli
dc.contributor.author Stoddart, J. Fraser
dc.date.accessioned 2011-09-13T06:04:21Z
dc.date.available 2011-09-13T06:04:21Z
dc.date.copyright 2009
dc.date.issued 2011-09-13
dc.identifier.citation Zhao, Y. L., & Stoddart, J. F. (2009). Azobenzene-Based Light-Responsive Hydrogel System. Langmuir, 25(15), 8442-8446.
dc.identifier.issn 0743-7463
dc.identifier.uri http://hdl.handle.net/10220/7045
dc.description.abstract A deoxycholic acid-modified β-cyclodextrin derivative (2) and an azobenzene-branched poly(acrylic acid) copolymer (3) were prepared, and the association and dissociation of 2 with the trans/cis-azobenzene units in 3 were characterized by UV/vis spectroscopy, induced circular dichroism, and 1H NMR spectroscopy. The experimental results indicate that the trans-azobenzene units are bound strongly within the cavities of 2 whereas the cis-azobenzene is not bound at all. A supramolecular inclusion complex (1), formed by 2 and 3, is accompanied by the formation of a hydrogel. The light-responsive gel-to-sol and sol-to-gel phase transitions of the hydrogel, induced by trans-cis photoisomerization of the azobenzene units, were investigated. In the hydrogel system, the trans-azobenzene units in 3 are included inside the hydrophobic cavity of 2. Upon photoirradiation with UV light of 355 nm, the hydrogel is converted efficiently to the sol phase because the trans-azobenzene units are converted photochemically to their cis configurations, whereupon the resulting cis-azobenzene units dissociate from 2. The hydrogel can be recovered from the sol phase by photoirradiation with visible light of 450 nm. The swelling ratio for fresh hydrogel samples, which was found to be 8.7 ± 0.7, was measured for a number of gel-to-sol and sol-to-gel phase-transition cycles.
dc.format.extent 5 p.
dc.language.iso en
dc.relation.ispartofseries Langmuir
dc.rights © 2009 American Chemical Society
dc.subject DRNTU::Science::Biological sciences::Biochemistry
dc.title Azobenzene-based light-responsive hydrogel system
dc.type Journal Article
dc.contributor.school School of Physical and Mathematical Sciences
dc.identifier.doi http://dx.doi.org/10.1021/la804316u
dc.description.version None of the above
dc.identifier.rims 159756

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