Composite Microdiscs with a Magnetic Belt: Preparation, Chaining Properties, and Use as Switchable Catalyst Carriers

We describe an emulsion-based preparation of patchy composite particles (diameter of 100–500 μm) consisting of a disclike epoxy core and a belt of porous polystyrene particles (diameter of 30 μm) with magnetite within the pores. Compared to the magnetically uniform polystyrene particles, the spontan...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2015-04, Vol.7 (14), p.7795-7800
Main Authors: Knaapila, Matti, Høyer, Henrik, Helgesen, Geir
Format: Article
Language:English
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Summary:We describe an emulsion-based preparation of patchy composite particles (diameter of 100–500 μm) consisting of a disclike epoxy core and a belt of porous polystyrene particles (diameter of 30 μm) with magnetite within the pores. Compared to the magnetically uniform polystyrene particles, the spontaneous aggregation of composite particles is suppressed when dispersed into liquid, which is attributed to the increased particle size, reduced magnetic susceptibility, and the shape of the magnetic domain distribution within the particles (spherical versus a belt). When the composite particles are coated by platinum–palladium layer we demonstrate they can be employed as switchable catalyst carriers, moving from one liquid phase to another when controlled by an external magnetic field.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.5b01053