2 research outputs found
Facile Synthesis of Fluorescent Silica-Doped Polyvinylpyrrolidone Composites: From Cross-Linked Composite Film to Core–Shell Nanoparticles
Fluorescent
silica-doped polyvinylpyrrolidone (PVP) composites
with high optical properties have been successfully prepared in a
one-pot synthesis through the incorporation of silica nanoparticles
and dye molecules into the cross-linked PVP. Scanning electron microscopy,
transmission electron microscopy, and fluorescence spectrometry are
used to investigate the morphologies and optical properties of the
composites. By adjusting the PVP content and reaction time, fluorescent
silica-doped PVP film and fluorescent PVP-covered silica core–shell
nanoparticles are obtained without stirring and under magnetic stirring,
respectively. Because both the silica nanoparticles and the dye molecules
react with ring-opened PVP, the composites exhibit highly stable optical
properties. The obtained fluorescent composites may have potential
applications in sensing and photovoltaic systems. The facile approach
can be extended to the preparation of multifunctional fluorescent
PVP composites by introducing other types of oxides
Bifunctional Magnetic-Fluorescent Nanoparticles: Synthesis, Characterization, and Cell Imaging
A new type of bifunctional magnetic-fluorescent
Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>–PDI–PAA/Ca<sup>2+</sup> nanoparticles has been prepared by coating PDI-cored star
polymers (PDI–PAA) onto the surface of Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> core–shell nanostructures. The morphology
and properties of the composite nanoparticles are investigated by
transmission electron microscopy, ultraviolet–visible spectrometry,
fluorescence spectrometry, and vibrating sample magnetometry. The
composite nanoparticles display a strong red emission and superparamagnetic
behavior at room temperature. The cell viability and uptake assays
reveal good biocompatibility of these hybrid nanoparticles. Hence,
the composite nanoparticles are of potential to be further explored
as therapeutic vector in biomedical field