Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Reexamination Certificate
2007-05-08
2010-11-02
Kastler, Scott (Department: 1793)
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
C252S37800R, C423S44500R, C423S447100
Reexamination Certificate
active
07824651
ABSTRACT:
The present invention provides a method of exfoliating a layered material (e.g., graphite and graphite oxide) to produce nano-scaled platelets having a thickness smaller than 100 nm, typically smaller than 10 nm. The method comprises (a) dispersing particles of graphite, graphite oxide, or a non-graphite laminar compound in a liquid medium containing therein a surfactant or dispersing agent to obtain a stable suspension or slurry; and (b) exposing the suspension or slurry to ultrasonic waves at an energy level for a sufficient length of time to produce separated nano-scaled platelets. The nano-scaled platelets are candidate reinforcement fillers for polymer nanocomposites. Nano-scaled graphene platelets are much lower-cost alternatives to carbon nano-tubes or carbon nano-fibers.
REFERENCES:
patent: 2798878 (1957-07-01), Hummers
patent: 3434917 (1969-03-01), Kraus et al.
patent: 3885007 (1975-05-01), Olsen et al.
patent: 4091083 (1978-05-01), Hirschvogel et al.
patent: 4244934 (1981-01-01), Kondo et al.
patent: 4895713 (1990-01-01), Greinke et al.
patent: 5186919 (1993-02-01), Bunnell
patent: 5330680 (1994-07-01), Sakawaki et al.
patent: 5503717 (1996-04-01), Kang
patent: 5698088 (1997-12-01), Kang
patent: 5902762 (1999-05-01), Mercuri et al.
patent: 6287694 (2001-09-01), Zaleski et al.
patent: 6872330 (2005-03-01), Mack et al.
patent: 7071258 (2006-07-01), Jang et al.
patent: 2004/0033189 (2004-02-01), Kaschak et al.
patent: 2007/0131915 (2007-06-01), Stankovich et al.
Viculis et al. “A chemical route to carbon nanoscrolls.” Science. Washington: Feb 28, 2003. vol. 299, Iss. 5611; p. 1361.
U.S. Appl. No. 11/509,924, filed Aug. 25, 2006, Jang et al.
U.S. Appl. No. 11/526,489, filed Sep. 26, 2006, Jang et al.
U.S. Appl. No. 11/709,274, filed Feb. 20, 2007, Jang et al.
U.S. Appl. No. 11/787,442, filed Apr. 17, 2007, Zhamu et al.
J. J. Mack, et al., “Graphite Nanoplatelet Reinforcement of Electrospun Polyacrylonitrile Nano-fibers,” Adv. Materials, 7 Jan. 6, 2005 , pp. 77-80.
Chen, et al. “Preparation and Characterization of Graphite Nanosheets from Ultrasonic Powdering Technique,” Carbon, vol. 42, 2004, 753-759).
M. Lotya, et al, “Liquid Phase Production of Graphene by Exfoliation of Graphite in Surfactant/Water Solutions,” J. Am. Chem. Soc, vol. 131 (2009) 3611-3620.
Guo Jiusheng
Jang Bor Z.
Shi Jinjun
Zhamu Aruna
Kastler Scott
Levy Mark
Nanotek Instruments, Inc.
Thompson & Hine
Walck Brian
LandOfFree
Method of producing exfoliated graphite, flexible graphite,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of producing exfoliated graphite, flexible graphite,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing exfoliated graphite, flexible graphite,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4177876