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  • Title: Fabrication and evaluation of chitosan/NaYF4:Yb3+/Tm3+ upconversion nanoparticles composite beads based on the gelling of Pickering emulsion droplets.
    Author: Yan H, Chen X, Shi J, Shi Z, Sun W, Lin Q, Wang X, Dai Z.
    Journal: Mater Sci Eng C Mater Biol Appl; 2017 Feb 01; 71():51-59. PubMed ID: 27987738.
    Abstract:
    The rare earth ion doped upconversion nanoparticles (UCNPs) synthesized by hydrophobic organic ligands possess poor solubility and low fluorescence quantum yield in aqueous media. To conquer this issue, NaYF4:Yb3+/Tm3+ UCNPs, synthesized by a hydrothermal method, were coated with F127 and then assembled with chitosan to fabricate the chitosan/NaYF4:Yb3+/Tm3+ composite beads (CS/NaYF4:Yb3+/Tm3+ CBs) by Pickering emulsion system. The characterization results revealed that the as-synthesized NaYF4:Yb3+/Tm3+ UCNPs with an average size of 20nm exhibited spherical morphology, high crystallinity and characteristic emission upconversion fluorescence with an overall blue color output. The NaYF4:Yb3+/Tm3+ UCNPs were successfully conjugated on the surface of chitosan beads by the gelling of emulsion droplets. The resultant CS/NaYF4:Yb3+/Tm3+ CBs showed good upconversion luminescent property, drug-loading capacity, release performance and excellent biocompatibility, exhibiting great potentials in targeted drug delivery and tissue engineering with potential tracking capability and lasting release performance.
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