Graphene yog dab tsi?
Graphene yog ib qho tshiab hexagonal honeycomb lattice khoom tsim los ntawm cov ntim ze ntawm ib txheej carbon atoms. Nyob rau hauv lwm yam lus, nws yog ib tug ob-dimensional carbon cov ntaub ntawv thiab belongs rau tib lub heteromorphic lub cev ntawm carbon caij. Lub molecular daim ntawv cog lus ntawm graphene tsuas yog 0.142 nm, thiab lub dav hlau siv lead ua qhov sib nrug tsuas yog 0.335 nm.
Ntau tus neeg tsis muaj lub tswv yim ntawm chav tsev ntawm nano. Nano yog ib chav tsev ntawm qhov ntev. Ib nano yog li ntawm 10 mus rau qhov rho tawm 9 square meters. Nws luv dua li cov kab mob thiab loj li plaub atoms. Txawm li cas los xij, peb tsis tuaj yeem pom ib qho khoom ntawm 1 nm nrog peb qhov muag liab qab. Peb yuav tsum siv lub tshuab tsom. Qhov kev tshawb pom ntawm nanotechnology tau coj txoj kev loj hlob tshiab rau noob neej, thiab graphene kuj yog ib qho tseem ceeb ntawm cov cuab yeej sawv cev.
Txog tam sim no, graphene yog qhov sib xyaw ua ke uas tau pom nyob hauv tib neeg ntiaj teb. Nws thickness tsuas yog tuab li ib qho atom. Nyob rau tib lub sijhawm, nws kuj yog cov khoom siv lightest thiab cov khoom siv hluav taws xob zoo tshaj plaws hauv ntiaj teb.
Tib neeg thiab graphene
Txawm li cas los xij, keeb kwm ntawm tib neeg thiab graphene tau ua tiav rau ntau tshaj li ib nrab xyoo pua. Thaum ntxov li xyoo 1948, cov kws tshawb fawb tau pom tias muaj cov graphene nyob hauv qhov xwm txheej. Txawm li cas los xij, thaum lub sijhawm ntawd, nws nyuaj rau qib kev tshawb fawb thiab thev naus laus zis los tev graphene los ntawm cov txheej txheem ib leeg, yog li cov graphenes tau muab tso ua ke, qhia txog lub xeev ntawm graphite. Txhua 1 hli ntawm graphite muaj txog 3 lab txheej ntawm graphene.
Tab sis rau lub sij hawm ntev, graphene tau suav tias yog tsis muaj nyob. Qee tus neeg xav tias nws tsuas yog ib yam khoom uas cov kws tshawb fawb xav txog, vim tias yog graphene tiag tiag, vim li cas cov kws tshawb fawb tsis tuaj yeem rho tawm nws ib leeg?
Txog xyoo 2004, cov kws tshawb fawb Andre Geim thiab Konstantin Volov los ntawm University of Manchester hauv UK tau pom ib txoj hauv kev los cais cov graphene. Lawv pom tias yog tias cov graphite flakes raug stripped los ntawm cov kev taw qhia zoo heev pyrolytic graphite, ces ob sab ntawm cov graphite flakes tau daig rau ib daim kab xev tshwj xeeb, thiab tom qab ntawd cov kab xev raug torn, txoj kev no tuaj yeem ua tiav cov graphite flakes.
Tom qab ntawd, koj tsuas yog yuav tsum rov ua cov haujlwm saum toj no tsis tu ncua kom ua cov ntawv graphite hauv koj txhais tes nyias thiab nyias. Thaum kawg, koj tuaj yeem tau txais ib daim ntawv tshwj xeeb uas tsuas yog carbon atoms. Cov khoom ntawm daim ntawv no yog graphene. Andre Geim thiab Konstantin Novoselov kuj tau txais Nobel nqi zog rau kev tshawb pom ntawm graphene, thiab cov neeg uas hais tias graphene tsis muaj nyob tau raug ntaus lub ntsej muag. Yog li vim li cas graphene tuaj yeem qhia cov yam ntxwv zoo li no?
Graphene, huab tais ntawm cov ntaub ntawv
Thaum graphene tau tshawb pom, nws hloov pauv tag nrho cov txheej txheem ntawm kev tshawb fawb tshawb fawb thoob ntiaj teb. Vim tias graphene tau ua pov thawj tias yog cov khoom siv thinnest nyob hauv lub ntiaj teb, ib gram ntawm graphene yog txaus los npog cov qauv kev ncaws pob. Tsis tas li ntawd, graphene kuj muaj thermal thiab hluav taws xob conductivity zoo heev.
Cov ntshiab tsis xws luag dawb ib txheej graphene muaj qhov muaj zog thermal conductivity, thiab nws cov thermal conductivity yog siab li 5300w / MK (w / m · degree: piv txwv tias ib txheej tuab ntawm cov khoom yog 1m thiab qhov kub thiab txias sib txawv ntawm cov khoom. ob sab yog 1C, cov khoom siv no tuaj yeem ua cua sov tshaj plaws los ntawm thaj tsam ntawm 1m2 hauv ib teev), Nws yog cov khoom siv carbon nrog cov thermal conductivity siab tshaj plaws rau noob neej.
Khoom Parameters SUNGRAF BRAND
Qhov tsos xim Dub hmoov
Cov ntsiab lus carbon%> cuaj caum cuaj
Chip txoj kab uas hla (D50, um) 6 ~ 12
Cov dej noo% < ob
Qhov ceev g / cm3 0.02 ~ 0.08
Post lub sij hawm: May-17-2022