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Room temperature ferromagnetic gadolinium silicide nanoparticles

United States Patent

March 6, 2018
View the Complete Patent at the US Patent & Trademark Office
A particle usable as T.sub.1 and T.sub.2 contrast agents is provided. The particle is a gadolinium silicide (Gd.sub.5Si.sub.4) particle that is ferromagnetic at temperatures up to 290 K and is less than 2 .mu.m in diameter. An MRI contrast agent that includes a plurality of gadolinium silicide (Gd.sub.5Si.sub.4) particles that are less than 1 .mu.m in diameter is also provided. A method for creating gadolinium silicide (Gd.sub.5Si.sub.4) particles is also provided. The method includes the steps of providing a Gd.sub.5Si.sub.4 bulk alloy; grinding the Gd.sub.5Si.sub.4 bulk alloy into a powder; and milling the Gd.sub.5Si.sub.4 bulk alloy powder for a time of approximately 20 minutes or less.
Hadimani; Magundappa Ravi L. (Glen Allen, VA), Gupta; Shalabh (Ames, IA), Harstad; Shane (Rockford, MN), Pecharsky; Vitalij (Ames, IA), Jiles; David C. (Ames, IA)
Iowa State University Research Foundation, Inc. (Ames, IA)
15/ 332,940
October 24, 2016
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT This invention was made in part with Government support under Grant No. DE-AC02-07CH11358 awarded by the Department of Energy. The Government has certain rights in this invention.