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- Title
Photo-Crosslinked Coumarin-Containing Bis-Urea Amphiphile Hydrogels.
- Authors
Liu, Jie; Lou, Xianwen; Schotman, Maaike J. G.; Marín San Román, Patricia P.; Sijbesma, Rint P.
- Abstract
The design of photo-responsive supramolecular hydrogels based on coumarin dimerization and de-dimerization is described. The photo-responsive coumarin unit is chemically incorporated into an oligo(ethylene glycol) (OEG) bis-urea amphiphile that is capable of co-assembling with non-functionalized OEG amphiphile, to form supramolecular fibers. UV light with two different wavelengths (365 nm and 254 nm) is employed to induce a photo-reversible dimerization and de-dimerization process of coumarin units, respectively. The co-assembled solutions could be photo-crosslinked to induce a sol-to-gel transition through dimerization of coumarin with 365 nm UV light, and de-dimerization occurs with 254 nm UV light, to provide a weaker gel. In this system, the mechanical strength of supramolecular hydrogels can be tuned using the irradiation time, providing precise control of gelation in a supramolecular hydrogelator.
- Subjects
COUMARINS; HYDROGELS in medicine; AMPHIPHILES; SUPRAMOLECULAR chemistry; GELATION
- Publication
Gels (2310-2861), 2022, Vol 8, Issue 10, pN.PAG
- ISSN
2310-2861
- Publication type
Article
- DOI
10.3390/gels8100615