Ultrasonic-pab tau graphene dispersion
Ultrasonic graphene dispersion
Graphene yog lub ntiaj teb' s nyias thiab nyuaj ob-txheej txheej tsim ntawm ib txheej ntawm cov pa roj carbon atoms. Nws lub zog zoo heev, hloov tau yooj yim, hluav taws xob muaj peev xwm, thermal conductivity, thiab cov khoom siv hluav taws xob ua si lub luag haujlwm tseem ceeb hauv ntau daim teb. Muaj yog tsis muaj ib-txheej graphene nyob rau hauv lub xeev ntuj. Cov khoom siv feem ntau muaj xws li muaj peb-graphite graphite. Nws yog qhov tseem ceeb heev rau kev rho tawm ib leeg-txheej graphene los ntawm graphite.
Ultrasonic graphene dispersion tseem hu ua ultrasonic graphene exfoliation. Graphite oxide txo txoj kev thiab ultrasonic kev co tuaj yeem ua haujlwm zoo graphite oxide txheej nrug. Graphite oxide nrog cov txheej txheej loj dua tsis yog tsuas yog tsim txiaj rau qhov ntxig rau lwm cov lwg me me, atoms, thiab lwm yam ntawm cov khaubncaws sab nraud povtseg los ua graphite oxide Lub intercalation puas khoom yog yooj yim kom tau exfoliated rau hauv ib txheej graphite oxide, uas lays lub hauv paus rau qhov kev npaj ntxiv ntawm ib-txheej graphene.
Lub hauv paus ntsiab lus ntawm Ultrasonic Dispersion
Ultrasonic graphene dispersion yog kev siv ultrasonic cavitation los disperse agglomerated hais. Nws yog los tso rau qhov kev tshem tawm particle (kua) los lis hauv lub suab super-muaj zog thiab ua rau nws nrog kev tsim nyog ultrasonic amplitude. Raws li kev cuam tshuam ntxiv ntawm cavitation, kev kub, kev kub siab, micro dav hlau, muaj zog kev co, thiab lwm yam, qhov kev ncua deb ntawm cov lwg me me yuav nce txuas ntxiv, uas yuav kawg ua rau cov molecules tawg thiab tsim ib qho qauv qauv molecular. Cov khoom no yog tshwj xeeb tshaj yog rau dispersing nanomaterials (xws li carbon nanotubes, graphene, silicon dioxide, thiab lwm yam).
Muaj ntau ntawm cov ntaub ntawv graphite hauv qhov xwm, thiab graphite nrog lub tuab ntawm 1 hli muaj txog 3 lab txheej ntawm graphene. Ib txheej-graphite yog hu ua graphene, uas tsis muaj nyob hauv lub xeev pub dawb, thiab nws muaj nyob rau hauv daim ntawv ntawm cov ntawv graphite laminated nrog ntau cov txheej ntawm graphene. Txij li cov interlayer kev quab yuam ntawm graphite daim ntawv tsis muaj zog, nws tuaj yeem ua txheej txheej los ntawm txheej los ntawm sab nraud los ntawm kev quab yuam, yog li tau txais ib txheej-txheej graphene nrog tuab ntawm tsuas yog ib cov pa roj carbon atom.
Cov kev siv uas nquag siv tshaj
1. micromechanical txheej txheem txheej txheem
Siv daim kab xev kom ncaj qha tev cov graphene flakes los ntawm cov muaju loj dua thiab rov ua dua.
Thaum cov khoom siv los txhuam nrog pyrolytic graphite uas tau nthuav dav lossis nthuav tawm cov tsis xws luag, flake zoo li cov muaju ua rau saum npoo ntawm cov graphite, thiab cov nplaim-zoo li lub nplai muaj ib-txheej graphene.
Qhov tsis zoo: Graphene muaj cov khoom tso tawm qis, thaj chaw me me, nyuaj rau kev tswj hwm qhov loj me, kev siv qis, thiab tsis tuaj yeem npaj rau ntawm qhov loj.
2. Cov tshuaj vapor deposition txoj kev
Ib lossis ntau dua cov pa roj carbon-uas muaj cov khoom siv roj (feem ntau cov pa roj carbon huab cua qis qis qis qis) tau nkag mus rau hauv lub tshuab nqus cua, thiab cov pa roj carbon-roj tau decomposed thiab carbonized (feem ntau qis-carbon organic roj) ntawm qhov kub. Cov txheej txheem ntawm kev loj hlob cov keeb roj carbon.
Qhov tsis zoo: Lub hexagonal honeycomb crystal qauv ntawm graphene tsis tuaj yeem txig tag nrho, thiab qhov tsis zoo yog qhov tsis zoo raws li cov qauv microcomputer exfoliation. Tus nqi siab thiab cov khoom siv nruj tseev kom muaj kev txwv qhov loj-loj ntau lawm ntawm graphene, thiab ntxiv rau catalysts txo cov graphene purity.
3. Crystal epitaxial kev qhia kev loj hlob qauv
Ib qho yog tshem tawm Si los ntawm cua sov ib zaug siv lead ua 6H-SiC, thiaj li epitaxially loj hlob graphene nyob rau saum npoo ntawm SiC siv lead ua. Lub graphene nyob rau hauv kev sib cuag nrog Si txheej, thiab kev coj ua ntawm lub graphene no cuam tshuam los ntawm cov txheej hauv qab; qhov tod yog siv cov pa roj carbon hlau kab nyob rau hauv cov hlau siv lead ua ib leeg, los ntawm kev kub ceev annealing hauv qab ultra-siab nqus plua plav, cov pa roj carbon nyob rau hauv cov hlau nyob rau saum npoo ntawm cov hlau ib siv lead ua Graphene yog precipitated.
Qhov tsis zoo: Lub thickness ntawm graphene zaj duab xis tsis sib xws thiab nyuaj los tswj. Qhov tsim tawm graphene yog nruj rau hauv txheej txheej thiab nyuaj rau tev tawm, uas yuav cuam tshuam cov yam ntxwv ntawm graphene. Nyob rau tib lub sijhawm, nws yuav tsum muaj kev loj hlob nyob rau hauv kev nqus ntawm lub tshuab nqus tsev thiab muaj huab cua sov. Cov xwm txheej yog qhov tsis tshua xav tau thiab cov cuab yeej xav tau muaj siab. Kev npaj loj thiab tswj kav ntawm graphene tsis tuaj yeem ua tiav.
4. Graphite oxide txo txoj kev
Graphene oxide feem ntau tau los ntawm oxidation ntawm graphite nrog muaj acid. Nws muaj peb txoj kev tseem ceeb hauv kev npaj graphite oxide: Brodie txujci, Staudenmaier txujci thiab Hummers txujci. Ntawm lawv, Hummers txoj kev graphene dispersion yuav tsum muaj kev pab ultrasonic.
Nta: Hummers txheej txheem graphene dispersion: cov qauv yooj yim, siv sijhawm luv luv, kev ua kom loj, kev nyab xeeb thiab cov pa phem, nws yog ib qho siv tam sim no.
5. Ultrasound pab txoj kev
Ultrasonic graphene dispersion system siv ultrasonic-tau pab Hummers cov txheej txheem los npaj graphene oxide, uas siv cov kua ua ib qho nruab nrab thiab ntxiv cov loj-ntau ultrasonic kev co rau cov kua. Txij li thaum ultrasound yog cov neeg kho tshuab yoj, nws tsis tuaj yeem nqus los ntawm cov lwg me me thiab ua rau kev vibration ntawm molecules thaum tshaj tawm. Nyob rau hauv cov nyhuv cavitation, uas yog, qhov kev ncua deb ntawm lwg me me nyob rau hauv cov teebmeem ntxiv ntawm kev kub siab, kev kub siab, micro dav hlau, muaj zog kev co, thiab lwm yam. lwg me. Graphite oxide txheej spacing tuaj yeem ua tiav ntau dua, thiab nrog kev nce ntawm ultrasonic zog, qhov tau txais graphite oxide txheej spacing nyhav nthuav dav.
Lub siab tam sim ntawd tso tawm los ntawm ultrasound rhuav tshem van der Waals quab yuam ntawm txheej txheej graphene, ua rau nws nyuaj rau graphene los ua agglomerate ua ke. Graphite oxide nrog qhov sib xyaw ua tiav loj tsis tsuas yog muaj txiaj ntsig zoo rau kev tsim cov graphite oxide intercalation cov khoom sib txuas los ntawm kev nkag mus rau lwm cov lwg me me, atoms, thiab lwm yam, tab sis kuj yooj yim kom tau exfoliated rau hauv ib txheej graphite oxide, tso lub hauv paus rau kev npaj ntxiv ntawm ib txheej graphene.
Cov khoom siv ultrasonic dispersion tuaj yeem siv rau graphene, number case txheej, thiab lwm yam. Dispersion, homogenization kho; roj av emulsification; Suav tshuaj rho tawm kev; cell, ballast dej crushing, tshuaj tua kab mob; cov khoom siv tshuaj lom neeg kom nrawm tshuaj tiv thaiv thiab lwm yam.
