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Title: Magnetorheological materials, method for making, and applications thereof

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 %.
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Issue Date:
OSTI Identifier:
University of Rochester (Rochester, NY) NNSASC
Patent Number(s):
Application Number:
Contract Number:
Research Org:
University of Rochester, Rochester, NY (United States)
Sponsoring Org:
Country of Publication:
United States

Works referenced in this record:

Studies on preparation and chemical stability of reduced iron particles encapsulated with polysiloxane nano-films
journal, January 2006

Magnetorheological fluid durability test—Iron analysis
journal, January 2007
  • Ulicny, John C.; Balogh, Michael P.; Potter, Noel M.
  • Materials Science and Engineering: A, Vol. 443, Issue 1-2, p. 16-24
  • DOI: 10.1016/j.msea.2006.06.050

A study on the chemical mechanical polishing of oxide film using a zirconia (ZrO2)-mixed abrasive slurry (MAS)
journal, April 2008
  • Park, Sung-Woo; Seo, Yong-Jin; Lee, Woo-Sun
  • Microelectronic Engineering, Vol. 85, Issue 4, p. 682-688
  • DOI: 10.1016/j.mee.2007.12.049