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)
U.S. Pat. 3,764,540; Oct. 9, 1973; Chem Abstr. 79:141,010W
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.