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Magnetorheological materials, method for making, and applications thereof

United States Patent

August 19, 2014
View the Complete Patent at the US Patent & Trademark Office
A magnetorheological material comprises a magnetic particle and a ceramic material, wherein the magnetorheological material is in a dried form and further wherein a portion of the ceramic material is in the form of a nanocrystalline coating over the entire exterior surface of the magnetic particle and another portion of the ceramic material is in the form of a free nanocrystal. A magnetorheological material comprises a magnetic particle having a ceramic material coating over an external surface thereof as a result of a coating process, and a free nanocrystal of the ceramic material in the form of a residual by-product of the coating process. A sol-gel process for making a magnetorheological product comprises providing a sol of a desired ceramic coating material; combining a desired quantity of carbonyl iron (CI) particles with the sol to coat the CI particles with the ceramic coating material; creating a resulting quantity of nanocrystalline ceramic material-coated CI particles and a quantity of free nanocrystals of the ceramic material; and, drying the resulting quantity of coated CI particles and free nanocrystals to a moisture content equal to or less than 2 wt %.
Shen; Rui (Rochester, NY), Yang; Hong (Rochester, NY), Shafrir; Shai N. (Rochester, NY), Miao; Chunlin (Rochester, NY), Wang; Mimi (San Marino, CA), Mici; Joni (Worcester, MA), Lambropoulos; John C. (Pittsford, NY), Jacobs; Stephen D. (Pittsford, NY)
University of Rochester (Rochester, NY)
12/ 575,770
October 8, 2009
GOVERNMENT SPONSORSHIP This invention was made with government support under U.S. Army Cooperative Agreement Number W15QKN-06-2-0104 and by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement Number DE-FC52-08NA28302. The government may have rights in this invention.