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A stimuli responsive lanthanide-based hydrogel possessing tunable luminescence by efficient energy transfer pathways

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Journal of Rare Earths 2022年第5期40卷 696-701,I0001页

作者： Yuan Wang Jinglei Chen Yuan Shang Peng Li Huanrong Li Tianjin Key Laboratory of Chemical Process Safety School of Chemical Engineering and TechnologyNational-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources UtilizationHebei University of TechnologyTianjin 300130China

Energy transfer as an important component in light-harvesting antenna systems can mimic effectively natural photosynthesis processes,showing great potential in optoelectronic ***,we report a responsive polymeric hydrogel based on the combination of excited state intramolecular proton transfer(ESIPT) molecule(Salicylic acid,Sal) and terbium(Ⅲ)(Tb^(3+)),as enabled by external stimuli to construct artificial light-harvesting antenna *** from unique photophysical properties of Sal,the synthesized hydrogel displays a temperature-dependent reversible opaque?transparent states transition,accompanied with an interesting photoluminescence ***,by further incorporating europium(Ⅲ)(Eu^(3+)) into the hydrogel,we demonstrate well-defined cascades of energy transfer that provides a tunable optical output from the collection of lanthanides by the excitation of a common sensitizer(Sal) upon base vapor *** energy transfer efficiency from Tb^(3+) to Eu^(3+),as high as 97.8%,was also obtained as established by the time-resolved fluorescence spectroscopy analysis.

关键词： Energy transfer Lanthanides stimuli-responsive hydrogel Luminescence Rare earths

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Dual stimuli-responsive polyurethane-based hydrogels as smart drug delivery carriers for the advanced treatment of chronic skin wounds

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Bioactive Materials 2021年第9期6卷 3013-3024页

作者： Rossella Laurano Monica Boffito Michela Abrami Mario Grassi Alice Zoso Valeria Chiono Gianluca Ciardelli Politecnico di Torino Mechanical and Aerospace Engineering DepartmentCorso Duca degli Abruzzi 2410129TorinoItaly Universitàdegli Studi di Trieste Department of Engineering and ArchitectureVia Alfonso Valerio 6/134127TriesteItaly

The design of multi-stimuli-responsive vehicles for the controlled and localized release of drugs is a challenging issue increasingly catching the attention of many research groups working on the advanced treatment of hard-to-close *** this work,a thermo-and pH-responsive hydrogel(P-CHP407)was prepared from an ad hoc synthesized amphiphilic poly(ether urethane)(CHP407)exposing a significant amount of-COOH groups(8.8±0.9 nmol/g_(polymer)).The exposure of acid moieties in P-CHP407 hydrogel led to slightly lower initial gelation temperature(12.1◦C vs.14.6◦C,respectively)and gelation rate than CHP407 hydrogel,as rheologically *** hydrogel characterization by Low Field NMR(LF-NMR)spectroscopy suggested that the presence of carboxylic groups in P-CHP407 caused the formation of bigger micelles with a thicker hydrated shell than CHP407 hydrogels,as further proved by Dynamic Light Scattering *** addition,P-CHP407 hydrogel showed improved capability to change its internal pH compared to CHP407 one when incubated with an alkaline buffer(pH 8)(e.g.,pH_(change_5min)=3.76 and 1.32,respectively).Moreover,LF-NMR characterization suggested a stronger alkaline-pH-induced interaction of water molecules with micelles exposing-COOH ***,the hydrogels were found biocompatible according to ISO 10993 and able to load and release Ibuprofen:delivery kinetics of Ibuprofen was enhanced by P-CHP407 hydrogels at alkaline pH,suggesting their potential use as smart delivery systems in the treatment of chronic infected wounds.

关键词： stimuli-responsive hydrogel Drug delivery system pH-triggered release Advanced wound treatment Polyurethane hydrogel LF-NMR characterization

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