材料科学英语Unit 2 Lecture 2 Graphene.ppt

TheComponentsofMaterialsUnit2

Doyouknowtheconnectionbetweendiamondsandgraphite?2.Whatmakesthemdifferentfromeachother?Unit22Graphene

Unit22Thediamond(thehardestmineralknowntoman)ismadeupofanatomstructurewhichisformedintoacomplexlatticearrangementintheelement.Graphitebycontrastisoneoftheweakestmineralsknowntoman,becauseitsatomsarebondedbyveryweakbondsinfragilelayers/sheetsaboveandbelowoneanother,buteachlayerisnotbondedtotherest.?

Thecarbon-carbonbondsinbothmineralsareactuallyquitestrong,butitistheapplicationofthosebondsthatmakethedifference.Thecarbonatomsarearrangeddifferentlyindiamondsandgraphite.Theyarebothcarbon,buttheirinternalstructureisdifferent.Theyareallotropesofcarbon.Graphene

Graphene4Unit2Whatisgraphene?Howwasitdiscovered?Whyisitunusual?Whatcanitbeusedfor?AnIntroductiontoGraphene

Unit21RelationshipGraphene??isanallotropeof?carbon?intheformofa?two-dimensional,atomic-scale,honey-comblatticeinwhichoneatomformseachvertex.Itisthebasicstructuralelementofotherallotropes,including?graphite,charcoal,?andcarbonnanotubes??.

GrapheneUnit21Graphenehasmanyextraordinaryproperties.Itisabout100timesstrongerthanthestrongeststeel.Itconductsheatandelectricityefficientlyandisnearlytransparent.比表面积：单位质量物料所具有的总面积。

GrapheneUnit21RelationshipGrapheneisjustoneatomthick,butremarkablystrong.Scientistshavesuggestedthatitwouldtakeanelephant,balancedonapenciltobreakthroughasinglesheet.?

GrapheneUnit21RelationshipTheglobalmarketforgrapheneisreportedtohavereached$9millionby2014withmostsalesinthesemiconductor,electronics,batteryenergyandcompositesindustries(复合材料行业）.

Unit22RelationshipSirAndreKonstantinGeim,??(born21October1958)isaSoviet-bornDutch-British?physicistworkinginthe?Sch