Massively ordered microstructures composed of magnetic nanoparticles.
J Phys Condens Matter
; 21(26): 264014, 2009 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-21828462
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.
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Coleções:
01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article