Thermo- and pH- dual responsive inorganic-organic hybrid hydrogels with tunable luminescence
Release Time:2019-03-11 Hits:
Indexed by: Journal Article
Date of Publication: 2018-03-01
Journal: SCIENCE CHINA-CHEMISTRY
Included Journals: EI、SCIE
Volume: 61
Issue: 3
Page Number: 328-335
ISSN: 1674-7291
Key Words: stimuli responsive; block copolymer; polyoxometalate; hydrogel; luminescence
Abstract: A thermo- and pH- dual responsive luminescent hydrogel was successfully constructed by coupling dysprosium-containing polyoxometalates Na9DyW10O36 (DyW10) with the ABA triblock copolymer, where the B block is PEO and the A block is the thermosensitive poly(methoxydi(ethylene glycol) methacrylate-co-N,N-dimethylaminoethyl methacrylate). The complex hybrid underwent a sol-gel phase transition above the lower critical solution temperature (LCST) of the A block. DyW10 was electrostatically encapsulated into the hydrophobic domain of the A block with enhanced photoluminescence. When temperature cooled down, the luminescence could be restored. By addition of acids to protonate the A block, and emission of DyW10 was simultaneously enhanced. Sensitivity of poly(N,N-dimethy laminoethyl methacrylate) (PDMAEMA) to pH also enabled the emission of DyW10/copolymer hydrogel to be reversibly switched by alternating acid/base treatments.
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