We report af acile and generic method for the synthesis of hollowmesoporous silica nanoreactors (HMSNs) with small-sized metal oxide nanoparticles (NPs) inside their cavities.T hey were made by deposition of silica onto metalcontaining charge-driven polymer micelles and subsequent calcination. The micelles consist of 1) negatively charged supramolecular polyelectrolyte chains of bis-ligand-bound metal ions,a nd 2) water-soluble,n eutral/positive diblock copolymers.O wing to the facile coordination between transition-metal ion and the employed bidentate ligand, aseries of HMSNs with < 2nmM x O y NPs inside cavities (M = Mn, Co, Ni, Cu, or Zn) were obtained by simply varying the metal ions inside the micelles.The developed method circumvents the preand post-synthesis of metal oxide NPs;a fter calcination, hollowm esoporous nanostructures containing small-sized metal oxide NPs inside their cavities are directly obtained.
We report af acile and generic method for the synthesis of hollowmesoporous silica nanoreactors (HMSNs) with small-sized metal oxide nanoparticles (NPs) inside their cavities.T hey were made by deposition of silica onto metalcontaining charge-driven polymer micelles and subsequent calcination. The micelles consist of 1) negatively charged supramolecular polyelectrolyte chains of bis-ligand-bound metal ions,a nd 2) water-soluble,n eutral/positive diblock copolymers.O wing to the facile coordination between transition-metal ion and the employed bidentate ligand, aseries of HMSNs with < 2nmM x O y NPs inside cavities (M = Mn, Co, Ni, Cu, or Zn) were obtained by simply varying the metal ions inside the micelles.The developed method circumvents the preand post-synthesis of metal oxide NPs;a fter calcination, hollowm esoporous nanostructures containing small-sized metal oxide NPs inside their cavities are directly obtained.
In
this study, a one-pot method for preparing porous hollow silica
nanospheres (PHSNs) encapsulating rare earth metal oxide nanoparticles
(NPs) is reported. The synthetic route employs charge-driven micelles
as templates, which consists of negatively charged complex chains
of bis-ligand-bound rare earth metal ions and positively charged diblock
copolymer. By deposition of silica onto the micellar coronas and subsequent
calcination, a series of M
x
O
y
@PHSNs (M = La, Ce, Eu, and Gd) were synthesized.
The relevant characterizations confirm that these nanostructures consist
of ∼30 nm hollow silica nanospheres and small-sized metal oxide
NPs inside ∼12 nm cavities. Degradations of methylene blue
and new coccine with H2O2 over M
x
O
y
@PHSNs reveal that
the Ce
x
O
y
NP
integrated PHSNs show the best catalytic properties among these M
x
O
y
@PHSNs, and
incorporation of Cu
x
O
y
with Ce
x
O
y
further increases the activity for methylene blue degradation.
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