1 Department of Physics, Technical University of Denmark2 Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark3 GIAMAG Technologies AS4 University of Oslo
Preparation, Chaining Properties, and Use as Switchable Catalyst Carriers
We describe an emulsion-based preparation of patchy composite particles (diameter of 100-500 mu m) consisting of a disclike epoxy core and a belt of porous polystyrene particles (diameter of 30 mu m) 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.
A C S Applied Materials and Interfaces, 2015, Vol 7, Issue 14, p. 7795-7800
Magnetic particles; Patchy particles; Hybrid materials; Active materials; Anisotropy; Catalyst