Magnetic Core–Shell Particles: Preparation of Magnetite Multilayers on Polymer Latex Microspheres

Abstract

Colloidal particles with magnetic properties are attractive due to their tunable anisotropic interactions. Here is reported a new class of polystyrene-core magnetite-shell particles produced by the sequential adsorption of nanoparticles and polyelectrolyte, a process that allows the shell thickness and composition to be controlled with nanometer precision. The Figure shows the alignment of the nanocomposite particles in the presence of a magnetic field.