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AuthorKasak P.
AuthorDanko M.
AuthorZavahir S.
AuthorMrlik M.
AuthorXiong Y.
AuthorYousaf A.B.
AuthorLai W.-F.
AuthorKrupa I.
AuthorTkac J.
AuthorRogach A.L.
Available date2020-04-01T06:59:41Z
Publication Date2019
Publication NameScientific Reports
ISSN20452322
URIhttp://dx.doi.org/10.1038/s41598-019-51512-2
URIhttp://hdl.handle.net/10576/13669
AbstractWe introduce a simple approach to fabricate fluorescent multivalent metal ion-free alginate hydrogels, which can be produced using carbon dots accessible from natural sources (citric acid and L-cysteine). Molecular fluorophore 5-oxo-2,3-dihydro-5H-[1,3]-thiazolo[3,2-a] pyridine-3,7-dicarboxylic acid (TPDCA), which is formed during the synthesis of carbon dots, is identified as a key segment for the crosslinking of hydrogels. The crosslinking happens through dynamic complexation of carboxylic acid groups of TPDCA and alginate cages along with sodium ions. The TPDCA derived hydrogels are investigated regarding to their thermal, rheological and optical properties, and found to exhibit characteristic fluorescence of this aggregated molecular fluorophore. Moreover, gradient hydrogels with tunable mechanical and optical properties and controlled release are obtained upon immersion of the hydrogel reactors in solutions of divalent metal ions (Ca2+, Cu2+, and Ni2+) with a higher affinity to alginate. - 2019, The Author(s).
SponsorThis contribution was made possible by the NPRP award [8–878–1–172] from Qatar National Research Fund (a member of Qatar foundation), Qatar University grant QUCG-CAM-19/20-2 and by a grant from the Germany/ Hong Kong Joint Research Scheme sponsored by the Research Grants Council of Hong Kong and the Germany Academic Exchange Service of Germany (Reference No.: G-CityU103/16). M.D. thanks the VEGA Scientific Grant Agency for support through project no. 2/0158/17.
Languageen
PublisherNature Publishing Group
SubjectSemiconductor quantum dots
SubjectCarbon
SubjectDots GQDs
TitleIdentification of Molecular Fluorophore as a Component of Carbon Dots able to Induce Gelation in a Fluorescent Multivalent-Metal-Ion-Free Alginate Hydrogel
TypeArticle
Issue Number1
Volume Number9


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