From Nanodots to Nanorods: Oriented aggregation and magnetic evolution of nanocrystalline goethite

Details From Nanodots to Nanorods: Oriented aggregation and magnetic evolution of nanocrystalline goethite From Nanodots to Nanorods: Oriented aggregation and magnetic evolution of nanocrystalline goethite

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j..19g&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 10, pp. 19-1, CiteID 1512, DOI 10.1029/2003GL017021

Physics

9

Geomagnetism And Paleomagnetism: Environmental Magnetism, Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Mineralogy And Petrology: General Or Miscellaneous

Scientific paper

Goethite is a common iron oxyhydroxide and an important mineral in the biogeochemical cycle of iron at the Earth's surface. However, environmental controls on its formation and alteration have been difficult to quantify. Perhaps this is because past studies have traditionally used needle-shaped goethite particles that are substantially larger than the goethite nanoparticles commonly observed in nature. High-resolution transmission electron microscopy and low-temperature magnetometry of synthetic goethite nanocrystals show that when aqueous suspensions are aged at 90°C, the nanocrystals grow almost exclusively by oriented aggregation of 3-4 nm primary nanocrystals. These primary particles are superparamagnetic above about 35 K, as shown by variations of magnetic susceptibility with temperature. At low temperature (<300 K), both remanent and induced magnetizations of primary nanoparticles are about an order of magnitude larger than for micron-sized goethite and can act as magnetic signatures of nanophase in controlled environments.

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