Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Reexamination Certificate
2006-10-17
2006-10-17
Vanoy, Timothy C. (Department: 1754)
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C423S138000, C423S022000, C423S053000, C423S111000, C423S089000, C423S069000, C423S062000, C423S021100, C423S632000, C423S633000, C423S607000, C423S625000, C423S624000, C423S618000, C423S608000, C423S594170, C423S606000, C423S263000, C423S140000, C423S055000, C423S122000, C423S092000, C423S085000, C423S065000, C977S773000, C977S775000, C977S777000, C977S811000
Reexamination Certificate
active
07122168
ABSTRACT:
In a metal oxide nanoparticle and a synthetic method thereof, and in particular to maghemite (γ-Fe2O3) nanoparticles usable as a superhigh density magnetic recording substance by having good shape anisotropy and magnetic characteristics, hematite (α-Fe2O3) nanoparticles usable as a precursor to the maghemite or a catalyst, maghemite and hematite-mixed nanoparticles and a synthetic method thereof, the method for synthesizing metal oxide nanoparticles includes forming a reverse micelle solution by adding distilled water, a surfactant and a solvent to metallic salt not less than trivalent, precipitating and separating gel type amorphous metal oxide particles by adding proton scavenger to the reverse micelle solution; adjusting a molar ratio of metal oxide to the surfactant by washing the gel type amorphous metal oxide particles with a polar solvent; and crystallizing metal oxide nanoparticles through heating or reflux after dispersing the gel type amorphous metal oxide particles in a non-polar solvent having a high boiling point.
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Ahn Jae-Pyoung
Lee Hae-Weon
Woo Kyoungja
Darby & Darby
Korea Institute of Science and Technology
Vanoy Timothy C.
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