Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Polymer Networks and Elastomers

CPP 3.8: Vortrag

Montag, 7. März 2016, 11:45–12:00, H40

Microstructural Study of SiO2 Coated Spherical Polyelectrolyte Brushes and Hollow Silica Nanoparticles as Observed by Small-Angle X-Ray Scattering — •Haoya Han^1,2, Li Li¹, Xuhong Guo¹, and Regine v. Klitzing² — ¹East China University of Science and Technology, Shanghai, PR China — ²Technical University of Berlin, Berlin, Germany

Organic-inorganic core-shell silica nanoparticles and silica hollow spheres with a porous morphology and tailored structure have received many attentions due to their versatile characteristics such as non-toxicity, biocompatibility and high mechanical strength. Here nanosized spherical polyelectrolyte brushes were successfully used as templates to synthesize monodisperse silica-coated core-shell nanospheres and hollow silica nanospheres. In order to better understand the formation mechanism of silica layer onto the brush layer and the structural details, the formed particles were systematically characterized by SAXS in combination with DLS, TEM, etc. The electron density of the outer silica layer was found higher than the inner silica layer from the SAXS fitting model. Core-shell microgel nanoparticles with polystyrene cores and crosslinked shell were further used as templates. The net-shape structure of the crosslinked shell hindered the free silica nanoparticle from going inside the brush layer. These results could promote better designs of core-shell silica nanospheres and hollow silica nanospheres, which should be ideal candidates for promising applications in drug delivery, catalysis and functional materials.