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(12)UnitedStatesPatent Zhamu etal. (54)SUPERCRITICALFLUIDPROCESSFOR PRODUCINGNANOGRAPHENEPLATELETS (75)Inventors:E.Ay,City,HSS: orZ.Jang,Centerville, (73) Assignee:NanotekInstruments,Inc.,Dayton,OH (US) (10)PatentNo.: US8,696,938B2 (45)DateofPatent: Apr.15,2014 s E: 139.t stal w4 acketal. 7,071,258B1 7/2006Jangetal. 2.93. E: 92.9 is al. c (*) (21) (22) (65) (51) -r Notice: Subjecttoanysite thet atent 1S eXtended Or adlusted under ps, 154(b)by1039E. Appl.No.: 12/229,493 1-1. Filed: Aug.25,2008 O O Prior Publication Data 2006/0235128A1* 10/2006Wangetal...524,445 2008/0255.294 A1* 10,2008 Yerushalmi-Rozen . 524/495 2010,074835A1 3/2010Mercuri.423(48 OTHERPUBLICATIONS Tomasko et al. “Supercritical fluid aplications in polymer nanocomposites.”Cur.Opin.inSolidState&Mater.Science.vol.7. pp.407-412,2003.* Hussainetal.“Reviewarticle:Polymer-matrixnanocomposites,pro cessing,manufacturing,andapplication:AnOverview.”J.ofCom positeMaterials.vol.40,No.17,pp.1511-1575,2006.* U.S.Appl.No.11/442,903,filedJun.26,2006,B.Z.Jang. U.S.Appl.No.10/858,814,filedJun.3,2004,B.Z.Jang,etal. Continued (Continued) Primary Examiner— TriV Nguyen (56) ReferencesCited U.S.PATENTDOCUMENTS vesselandthen(i)rapidlydepressurizingthefluidatafluid releaseratesuficientforefectingexfoliationofthegraphitic materialtoobtaintheNGP material.ConductiveNGPscanbe usedasaconductiveaditiveintransparentelectrodesfor Solarcelsorflatpaneldisplays(e.g.,toreplaceexpensive indium-tinoxide),bateryandSupercapacitorelectrodes,and nanocompositeforelectromagneticwaveinterference(EMI) shieldingandstaticchargedisipation,etc. 16Claims,5DrawingSheets US 2010/0044646A1 Int.Cl. COIB3L/04 Feb.25,2010 (2006.01) (2006.01) C04B I4/00 (52) U.S.Cl. USPC.252/378R;252/502;423/445R: (57) ABSTRACT 423/448;977/755;977/900 58) FieldofClassificationS h Thepresentinventionprovidesaprocessforproducingpris (58) s as:sg5 s8R:423/45R-447.3 tineornon-oxidizednanographeneplatelets(NGPs)thatare o. -r-tt., highlyconductive.Theprocesscomprises:(i)subjectinga 2002.0054995 A1 2003/0129.305 A1 5,2002 MaZurkiewicz 7,2003 Wu etal. S licationfilef 1423/s R755,900 graphiticmaterialtoaSupercriticalfluidatafirsttemperature eeapplicationfileforcompletesearchhistory. andafirstpressureforafirstperiodoftimeinapressure 2,798,878 A 4,987,175 A 5,019,446A 5,186,919A 5.330,680 A 6,287,694 B1 6,596,396B2 7,1957 Hummers 1/1991 Bunnell,Sr. 5/1991 Bunnell,Sr. 2/1993 Bunnell,Sr. 7,1994 Sakawakietal. 9,2001 Zaleskietal. 7/2003 Hirataetal. 8. USOO8696938B2 2/204Kaschaketal..524,495 204/034151A1 2005,OO14867A1* 1/2005Gularietal.. 523,215PDF Image | SCO2 Producing Nanographine Platelets
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