Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1995-10-16
2000-12-05
Le, Hoa T.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
428403, G02B 2600
Patent
active
061564281
ABSTRACT:
There is disclosed a method of making unsupported particles of a base metal selected from the group consisting of iron, cobalt, and nickel, which comprises combining an aqueous solution or suspension of a base metal salt, a strong base so that the resulting combination has an effective hydroxide ion concentration, and a reducing agent, which is then subjected to an autocatalytic reaction at about atmospheric pressure to form a precipitate of the metal. The unsupported base metal particles exhibit an anisometric morphology, generally platetlet or disk-shaped, and have a relatively high aspect or width to thickness ratio, which is preferably three or greater, exhibit ferromagnetic properties, and one or more of these base metals may be formed to exhibit a single magnetic domain. The resulting precipitate of metal particles may be formed as an agglomerate as by subjecting the precipitate to aging or to external means.
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Gibson et al, "Synthesis and Characterization of Anisometric Cobalt Nanoclusters", Science (Wash., D.C.), 267(5202), 1338-40, 1995.
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