Compositions – Magnetic – Flaw detection or magnetic clutch
Patent
1998-02-10
1999-09-28
Koslow, C. Melissa
Compositions
Magnetic
Flaw detection or magnetic clutch
252 6251R, 252 6256, H01R 144
Patent
active
059582820
ABSTRACT:
A ferrofluid manufacturing process applies energy to a nonmagnetic .alpha.-Fe.sub.2 O.sub.3 starting material to render it magnetic and suitable for use in a ferrofluid. The material is placed, together with a solvent and a surfactant, in a commercial attrition mill where the mill action converts the non-magnetic particles to magnetic particles. In order to eliminate a solvent replacement step which is necessary with oil carrier liquids, water is used as the grinding solvent and as the ferrofluid carrier liquid. The resulting water-based ferrofluid has a high saturation magnetization, low viscosity and good colloidal stability. Using the inventive method, a large volume of fluid can inexpensively be synthesized in a short time.
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Ferrohydrodynamics, cover and pp. 38-43, R.E. Rosensweig, Dover Publicatons, Inc., Mineola, NY, 1998 no month.
Aziz Lutful M.
Raj Kuldip
Ferrofluidic Corporation
Koslow C. Melissa
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