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Low-temperature method of producing nano-scaled graphene platelets and their nanocomposites

United States Patent

March 13, 2012
View the Complete Patent at the US Patent & Trademark Office
A method of exfoliating a layered material to produce separated nano-scaled platelets having a thickness smaller than 100 nm. The method comprises: (a) providing a graphite intercalation compound comprising a layered graphite containing expandable species residing in an interlayer space of the layered graphite; (b) exposing the graphite intercalation compound to an exfoliation temperature lower than C. for a duration of time sufficient to at least partially exfoliate the layered graphite without incurring a significant level of oxidation; and (c) subjecting the at least partially exfoliated graphite to a mechanical shearing treatment to produce separated platelets. The method can further include a step of dispersing the platelets in a polymer or monomer solution or suspension as a precursor step to nanocomposite fabrication.
Zhamu; Aruna (Centerville, OH), Shi; Jinjun (Columbus, OH), Guo; Jiusheng (Centerville, OH), Jang; Bor Z. (Centerville, OH)
Nanotek Instruments, Inc. (Dayton, OH)
11/ 787,442
April 17, 2007
This invention is based on the research result of a US Department of Energy (DoE) Small Business Innovation Research (SBIR) project. The US government has certain rights on this invention.