Lub luag haujlwm ntawm ultrasonic dispersion hauv kev npaj ntawm graphene
Ultrasonic dispersion yog ib txoj kev ntseeg tau los tsim txheej txheem graphene los ntawm graphite plaub ya ri lossis hais. Lwm yam kev sib txawv ntawm cov khoom tawg yooj yim (xws li pob mills, roller mills lossis siab sib xyaw shear siab) yog qhov cuam tshuam rau kev siv cov tshuaj tua hluav taws hnyav thiab cov kuab tshuaj. Lub tshuab ultrasonic dispersion tuaj yeem kov yeej cov teeb meem no thiab npaj cov khoom sau ntawv zoo rau graphene.
Ultrasonic graphene dispersion
Ultrasonic dispersion yuav hloov lub graphene hauv cov kua rau hauv lub xeev dispersed, uas yog, nplua lossis ultra-nplua ultrasonic sib tsoo cov khib nyiab lossis kua dej vim cov nyhuv ntawm ultrasonic kev co. Vim qhov tshwj xeeb ntawm ultrasonic teb tsim hauv nruab nrab cov kua, ultrasonic dispersion muab ib qho zoo heev cov kev coj tsis zoo, kev tshem tawm cov tshuaj lom neeg ntshiab (qhov loj me tsawg dua 1μm).
Lub hauv paus ntsiab lus ntawm ultrasonic kev npaj ntawm graphene
Kev npaj ultrasonic ntawm graphene yog raws li cov nyhuv cavitation, yog li ntawd quantum qauv sab hauv graphene yuav tsis raug rhuav tshem. Ultrasonic cavitation tuaj yeem tsim cov kev ua haujlwm siab ntau los ntawm high-power ultrasound. High-power ultrasound tuaj yeem siv rau kev ua kua, xws li sib xyaw, emulsifying, dispersing thiab de-agglomerating lossis kev sib tsoo. Thaum cov kua yog sonicated ntawm kev siv loj, lub suab sib kis tau tawm mus rau hauv nruab nrab ua kua ua rau hloov siab-nias (ntsuas) thiab tsis tshua muaj siab (rov qab ua haujlwm), qhov ntsuas raug nyob ntawm qhov zaus. Hauv kev voj voog uas tsis tshua muaj siab, siab-siv ultrasound yuav tsim cov npuas nqus me me los yog voids hauv cov kua. Thaum cov npuas ncav cuag lub ntim uas tsis tuaj yeem nqus tau lub zog, lawv lub cev qhuav dej thaum lub voj voog tshuab muaj zog siab. Qhov tshwm sim no hu ua cavitation.
Cavitation
Cov khoom siv dispersion ultrasonic yuav xa cov kev sib xyaw ua ke siab rau hauv cov kua, thiab daim ntawv thov ntawm qhov kev ntxhov siab no hauv tshuab tuaj yeem cais cov agglomeration ntawm graphene hais. Thaum cov kua ua qhov chaw ultrasonically, lub suab sib kis rau cov kua nruab nrab ua rau muaj kev kub siab (nias) thiab tsis tshua muaj siab (xav txog) kom rov ua hloov. Ultrasonic cavitation nyob rau hauv cov kua yuav ua rau lub siab ua kua roj ua kom siab txog 1000 km / teev (kwv yees li 600 mph). Qhov dav hlau no nyem cov kua ntawm qhov siab ntawm cov lus hais thiab cais cov graphene los ntawm kev sib xyaw. Cov kab xeb me me yuav ua kom nrawm nrog cov dav hlau ua kua thiab sib tsoo ntawm qhov nrawm. Lub zog sib xyaw ua rau lub zog poob siab los ntawm kev sib tsoo ntawm qhov kev sib tsoo tsis tu ncua ua rau sab npoo ntawm graphite lub cev, thiab cov graphite yuav muaj kev cuam tshuam thiab tsim kom muaj kev ntxhov siab. Thaum cov lej loj ntawm microbubbles tawg, qhov kev nyuaj siab tensile ntawm graphite flakes yuav txuas ntxiv, thiab graphene flakes yuav maj mam tev tawm.
Exfoliation thiab dispersion ntawm graphene
Yog hais tias graphene yog qhov yuav tsum tau siv los ua cov khoom siv, graphene yuav tsum tau ua ntej tusyees dispersed rau hauv kev tsim. Txij li graphene yog hydrophobic, nws yog qhov nyuaj kom tau txais cov siab-siab graphene dispersions yam tsis muaj surfactants lossis dispersants.
Graphene nanosheets (GNP) tuaj yeem ua los ntawm exfoliating graphite hauv cov kuab tshuaj los ntawm kev kho mob siab ultrasonic. Ultrasonic exfoliated graphene tuaj yeem ua haujlwm nrog biopolymer kom tau dej-dispersible graphene. Los ntawm ultrasonic cavitation, cov synthesized graphene tuaj yeem txuas ntxiv mus ua kev ruaj khov dej-raws kev tawg. Nws yog qhov yooj yim rau agglomerate thaum graphene nanometers tau sib xyaw ua kua. Ultrasonic dispersion tuaj yeem tsoo graphene agglomerated hauv dej thiab tsis-aqueous kev ncua, thiab tuaj yeem siv tag nrho lub peev xwm ntawm nano cov ntaub ntawv.
Graphene oxide yog dej-soluble thiab tau yooj yim mus rau hauv qhov chaw khov kho colloid. Ultrasonic exfoliation thiab dispersion yog ib qho ua tau zoo heev, sai thiab raug nqi ntau yam uas tuaj yeem coj los ua ke, tawg ua haujlwm thiab ua haujlwm hnyav rau graphene oxide ntawm qhov muaj nplai. Txhawm rau tswj hwm qhov loj ntawm graphene oxide (GO) nanosheets, cov txheej txheem exfoliation ua lub luag haujlwm tseem ceeb. Vim nws txoj kev txiav txim siab npliag thiab tswj tau, ultrasonic kev rho tawm haujlwm yog qhov txheej txheem feem ntau siv hauv txheej txheej hauv kev tsim cov khoom ua tau zoo hauv graphene thiab graphene oxide.
Graphene
Ultrasonic chaw pabcuam ua kua exfoliation
Kev ua kua exfoliation (LPE) yog qhov kev ua haujlwm zoo rau exfoliating graphene plaub ya ri. Lub hauv paus ntsiab lus yog ntxiv rau graphite lossis graphite oxide ua cov khoom siv hauv cov tshuaj ntxuav tshwj xeeb lossis surfactant kom do cov kub intercalation txheej los tsim cov tshuaj tiv thaiv graphene pretreatment, thiab tom qab ntawd siv cov ultrasonic tsis tso tawm los ntawm lub zog loj ultrasonic ntaus cov tev tawm graphene los ntawm graphite nto. tawm los.
Ua kua theem tev tawm qauv
Qhov tseem ceeb cuam tshuam ntawm ultrasonic-pab graphene exfoliation yog cavitation ntawm ultrasonic tsis thiab siab shear quab yuam. Lub cavitation thaum kho ultrasonic ua rau graphite dispersed hauv qhov hnyav yuav tsum tau crushed. Cov kev txiav txim siab ntawm lub zog ultrasonic tsis tuaj yeem ua rau cov kuab sib tov rau micro dav hlau kom cuam tshuam rau cov graphite nto thiab txhawb kev sib cais ntawm cov khaubncaws sab nraud povtseg graphite.
Dhuav dhau
Lub tshuab hluav taws xob muaj zog loj tuaj yeem siv rau tev tawm, kev faib tawm thiab kev npaj ntawm graphene thiab graphene oxide. Txhim khu kev qha ultrasonic processors thiab advanced reactors tuaj yeem muab lub zog uas xav tau rau graphene ua thiab tswj cov kev ua haujlwm, kom cov txiaj ntsig ultrasonic ua tau zoo tuaj yeem hloov kho rau cov hom phiaj xav tau.
