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Graphene Muaj Kev Kho Mob Kom Zoo Txhua Yam

Graphene yog cov khoom siv ob hom khoom ntim ob sab, uas muaj cov pa carbon atoms nrog raws li kev sib sau ua kom zoo. Cov pa carbon thiab carbon atoms los ntawm kev ua ke ntawm sp2 hybrid, nws cov qauv yog ruaj khov. Tus qauv tshwj xeeb ntawm graphene ua rau nws muaj ntau yam khoom zoo heev. Graphene yog tam sim no nyob rau hauv cov hardness ntawm cov khoom siv loj, thiab muaj cov khoom vaj khoom tsev zoo heev, theoretical deg cheeb tsam txog 2600m2 / g, nrog koj thermal conductivity, mus txog 3000W / (m · K). Tsis tas li ntawd, graphene kuj muaj kev sib txuas lus zoo. Nyob rau hauv chav sov, nws cov electronility muaj peev xwm ua tau siab li 20000cm2 / (V · s).

Vim cov khoom zoo ntawm graphene, cov neeg tshawb xyuas xav muab nws ua qhov cuab lub zog rau matrix khoom los txhim kho kev ua tiav ntawm cov khoom siv hauv matrix. Txawm li cas los xij, qhov feem ntau ntawm qhov chaw graphene feem ntau tuaj ua ke, tsis yog tsuas yog txo nws cov peev txheej adsorption, tiam sis tseem cuam tshuam zoo tshaj plaws ntawm graphene nws tus kheej, yog li cuam tshuam rau kev kawm ntawm graphene siv dua cov ntaub ntawv sib luag. Ntxiv mus, qhov kev sib tham no yog irreversible, tshwj tsis yog daim ntawv thov ntawm sab nraud rog, xws li ultrasound thiab muaj zog tov, yog li ntawd tusyees dispersed. Yuav kom tau cov graphene zoo heev, cov kws tshawb fawb tau ua cov kev tshawb fawb los ntawm kev tshaj tawm graphene agglomeration.

Ib qho ntawm kev siv ntau tshaj yog oxidize graphite thiab ultrasound los ua tawm ntawm oxide graphite, thiab tom qab ntawd los ntawm kev siv tshuaj los txo cov graphene, npaj cov graphene ntawm lub neej ntawm ib lub zog van der Waals force, yooj yim los sau rau hauv cov kua . Lwm txoj kev yog los sib xyaw cov graphene nyob rau hauv cov organic solvent los sis cov kua tshuaj tov rau ib qho surfactant kom adsorb molecular los sis surfactant molecules nyob saum npoo ntawm lub graphene, thiab kom ua tau li cas ntawm cov monolithic graphene dispersion. Lub peev xwm los thaiv cov agglomeration ntawm graphene los ntawm kev siv lub cev los yog kev hloov kho tshuaj, tab sis puas yog lub impurity kev nkag tau thaum lub sij hawm tsim ntawm cov txheej txheem cuam tshuam cov khoom ntawm cov txheej txheem sib xyaw kom raug kawm.

Qee qhov kev hloov kho deg siv thiab lwm cov kev siv los txhim kho lub pov haum ntawm graphene. Yuav kom txhim kho qhov sib npaug ntawm graphene thiab tooj liab matrix, nws yog ib qho ua tau kom tau txais cov khoom sib xyaw hauv cov graphene yog sib xyaw ua kom haum nyob rau hauv tooj liab. Nws pom tau tias cov graphene tuaj yeem tsis muaj teebmeem nyob rau hauv hom tooj liab los ntawm kev soj ntsuam ntawm cov khoom siv puas. Jing siv gallic acid nrog muaj zog txo kev muaj peev xwm li stabilizer thiab txo tus neeg saib xyuas kom tau cov graphene mas dispersible. Cov kev tsom xam yog vim tsim ntawm kev sib txuas ntawm π-π conjugate ntawm tus qauv npab benzene thiab cov graphene hauv molecule, uas yog adsorbed nyob rau saum npoo ntawm graphene ua ib qho kev ruaj ntseg. Qhov no ua rau ntawm daim ntawv thooj sab nraud muaj kev tiv thaiv tsis zoo, kom tsis txhob tuaj yeem txuam nrog cov graphene ua ke los ua kom yooj yim dua tuaj sib ntsib, los xyuas kom paub tias lub graphene uas tau npaj muaj ib qho kev kawm zoo siab.


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