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Magnetofluids and Their Manufacture.

Authors
Reimers-GW; Khalafalla-SE
Source
U S Pat 3 764 540 1973 Oct; :
Link
NIOSHTIC No.
10011958
Abstract
Magnetofluids from nonmagnetic precursor compounds are produced which require reduced grinding time in the manufacturing process. A 200-g sample of fe2o3 powder was reduced to fe0.91O weighing approximately 184 g. It was removed from the furnace crucible and quenched to room temperature. 100 Ml of oleic acid then was added, and the slurry was ball milled. A true colloidal suspension fluid resulted with a specific gravity of 0.806 and a viscosity of 2.87 Cp. The fluid exhibited a negative magnetic response; it was converted by refluxing at 250 deg. C into a suspension of magnetite and fe which exhibited a strong magnetic response and a decreased viscosity (0.806 Ml). (Ed.: Evidently should be cp; numbers also may be wrong, as they duplicate sp.Gr. Quoted above)
Publication Date
19731001
Document Type
PA;
Fiscal Year
1974
NTIS Accession No.
NTIS Price
Identifying No.
PAT 3,764,540
NIOSH Division
TCRC;
Source Name
U.S. Pat. 3,764,540; Oct. 9, 1973; Chem Abstr. 79:141,010W
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