Janus particles are widely used as
multifunctional materials for
catalytic reactions due to their controllable asymmetry and stability
efficiency of the interface structure. Herein, we propose a simple
approach to design an amphiphilic “hairy” Janus nanocatalyst,
which is composed of Fe3O4@catechol-formaldehyde
resin (CFR) core–shell microspheres with different hydrophilic–hydrophobic
polymer chains grafted on opposite sides of the microsphere and the
catalytically active metal particles directly supported on the hydrophilic
polymer chains. Amphiphilic Janus nanospheres (200–300 nm)
with hydrophilic poly (N-isopropylacrylamide) (PNIPAM) and hydrophobic
polystyrene (PSt) chains are synthesized by Pickering emulsion and
mussel-inspired methods, followed by in situ reduction of Pd nanoparticles
(Pd NPs) loaded onto the hydrophilic polymer chain side to form a
Janus-structured Pd@PNIPAM-S-Fe3O4@CFR-S-PSt
nanocatalyst. The amphiphilic Janus nanospheres have a good effect
on the stability of the emulsion. Due to its special structural composition,
the constructed Janus nanocatalyst exhibits excellent catalytic reduction
performance for dyes and nitroaromatic compounds in both water and
emulsion phases. Because of the existence of Fe3O4, the catalyst is easy to be separated and recovered, which augments
the catalytic reaction cycle. In addition, the presence of temperature-sensitive
PNIPAM polymer chains also enables the Janus nanocatalyst to display
controllable temperature-responsive behaviors in stabilizing emulsions
and emulsion catalysis. The as-prepared Janus nanomaterials with a
variety of functions and properties possess potential for application
in catalysis and biological and environmental areas.
In this article, we describe a facile approach for the preparation of amphiphilic Janus 2D graphene oxide (GO) nanosheets with catalytic properties by combining Pickering emulsion templates and surface-anchoring polymer...
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