
%0 Journal Article
%A Hilgendorff, Michael 
%A Tesche, Bernd 
%A Giersig, Michael 
%T Creation of 3-D Crystals from Single Cobalt Nanoparticles in External Magnetic Fields
%J Australian Journal of Chemistry
%D 2002/02/04
%V 54
%N 8
%P 497-501
%K 
%R https://doi.org/10.1071/CH01119
%U https://www.publish.csiro.au/paper/CH01119 
%X Using monodisperse nanocrystalline cobalt (Co) particles in non-polar colloidal dispersions, large areas of symmetric multi-dimensional structures were created using magnetophoretic deposition (MPD). To overcome the van der Waals and magnetic dipole&#8211;dipole interactions, the particles were stabilized with hydrophobic amines, phosphines, carboxylates and/or polymers. Depending on the preparation parameters, our particles had either bcc or &epsiv;-Co crystalline structures. Using MPD with magnetic fields up to 1 T, it was possible to create two-dimensional (2-D) arrays of near-perfect symmetry up to 1 m2 in size on various substrates, e.g. carbon-coated copper grids, silicon, or glass. Growth of the 2-D crystal was shown to be dependent on the direction of the applied external magnetic field. Three-dimensional (3-D) crystals could be created by increasing the magnetic field strength up to 6 T. 
