Magnetic Nanorods: Genesis, Self-Organization and Applications

Autor:	Helmut Wolf, R. Birringer, Andreas Michels, Christian Lang, Andreas Tschöpe
Rok vydání:	2008
Předmět:	Dipole Viscosity Ferrofluid Magnetic moment Condensed matter physics Spinodal decomposition Pattern formation Nanotechnology Nanorod Physical and Theoretical Chemistry Order of magnitude
Zdroj:	Zeitschrift für Physikalische Chemie. 222:229-255
ISSN:	2196-7156 0942-9352
DOI:	10.1524/zpch.2008.222.2-3.229
Popis:	Magnetic-field-assisted self-assembly of magnetic dipole moment carrying iron nanoparticles is shown to result in the formation of magnetic and mechanically stiff nanoscale rods. The cooperative behavior of an ensemble of such rods and bundles thereof exhibits self-organized pattern formation on different length scales. Pattern formation on large length scales reveals great similarity with physical systems undergoing spinodal decomposition. Possible applications for dipolar magnetic nanorods in the field of perpendicular storage media are highlighted. We discuss an aerosol-synthesis-route allowing to prepare ferrofluids (FF) with shape-anisotropic particles constituting the magnetic phase immersed in the nonmagnetic carrier fluid. These so-called nanorod FF unveil a two orders of magnitude increase of viscosity enforced by an applied field of 10mT even at shear rates larger than 10-2s. This raises prospects for applications in microfluidics and MEMS.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8e26ac9331ce5a0b56333e0753763e54 https://doi.org/10.1524/zpch.2008.222.2-3.229 Zobrazit plný text záznamu