title: Massively ordered microstructures composed of magnetic nanoparticles.
abstract: Magnetic γ-Fe(2)O(3) nanoparticle toluene solution was placed in a restricted, axially symmetric geometry composed of a spherical lens on a Si substrate (i.e., sphere-on-Si geometry), forming a capillary-held solution. The solvent evaporation led to the self-assembly of γ- Fe(2)O(3) nanoparticles into hundreds of spatially well-ordered, gradient concentric 'coffee rings'. The rings were two nanoparticle layers high with a monolayer of nanoparticle thin film formed in between. The ring width ranged from submicron to a few microns. The center-to-center distance between adjacent rings was on the order of a few microns. The size and packing of γ- Fe(2)O(3) nanoparticles, both within individual microscopic rings and in between, were dependent upon the preparation of the γ-Fe(2)O(3) nanoparticle toluene solution.
authors.affiliation: Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA.
authors.forename: Myunghwan
authors.initials: M
authors.lastname: Byun
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Zhiqun
authors.initials: Z
authors.lastname: Lin