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1、---------------------------------------------------------------范文最新推薦------------------------------------------------------多孔壁碳納米籠的提純研究摘要:本文對(duì)多孔壁碳納米籠的提純進(jìn)行了研究。使用不同種類酸對(duì)其酸洗再過濾提純,通過透射電鏡、X11/11---------------------------------------------------------------范文最新推薦----------
2、--------------------------------------------射線粉末衍射等測(cè)試,觀察其形貌和結(jié)構(gòu)變化及計(jì)算失重率得出最好的酸洗提純方法。由于石墨層包覆了鐵質(zhì)內(nèi)核,阻止了酸與鐵質(zhì)內(nèi)核接觸,增大了其被酸洗出去的難度,導(dǎo)致在使用單一酸進(jìn)行酸洗時(shí),鐵質(zhì)內(nèi)核未被除去。在本試驗(yàn)中,使用混合酸是一種有效提純方法,其增強(qiáng)了氧化性,比起單一酸洗,破壞了更多碳納米籠的石墨壁,從而使絕大多數(shù)的鐵質(zhì)內(nèi)核與酸反應(yīng),提高了碳納米籠提純的效率,盡管碳納米籠結(jié)構(gòu)遭到破壞。另一種有效提純方法是利用其磁性除去濃鹽酸酸洗后殘余的鐵質(zhì)雜質(zhì)
3、,也能獲得石墨壁完整的純碳納米籠,但是,磁性提純的失重率較混合酸提純的失重率高很多,提純效率低。5434關(guān)鍵字:碳納米籠;提純;酸洗;磁分離AnInvestigationonthePurificationoftheCarbonNanocageswithPorousShellsAbstract:Methodsforpurifyingcarbonnanocages(CNCs)withporousshellshavebeeninvestigated.Tofindoutthebestmethodforpurification,thec
4、hangesoftheCNCs’structureandmorphologywereobservedbytransmissionelectronmicroscopeandX-raydiffractionafterdifferentpurifications,andtheirweightlosswasalsocalculated.Becauseofbeingencapsulatedbygraphiticshells,theferrouscorescan’tcompletelytouchacidsoluti
5、onleadingtoanincompletepurificationbythesingleacidtreatment.Accordingtoourresults,themixedacidtreatmentisanefficientmethodtopurifythesamples.Themixedacidscanstronglyoxidizingthegraphiticshellsforexposingtheferrouscorestotheacidtoremovethem,comparedwithsingleacidtrea
6、tments.Thus,thismethodisanefficientone,despiteofviolentdamageof11/11---------------------------------------------------------------范文最新推薦------------------------------------------------------graphiticshells.Theothereffectivepurificationmethodisremovalofferrouscoresb
7、yanadditionalmagnetafterthesampleistreatedinHCltogetCNCswithintactgraphiticshells.However,themethodsisnotefficient,asitsweightlossisquitehigh.電泳法根據(jù)電泳速率不同將碳納米籠與其它雜質(zhì)顆粒相分離,得到的碳納米籠不會(huì)受到損壞。其基本方法是先將采用傳統(tǒng)電弧放電法制備的碳納米籠充分分散于異丙醇溶液中,離心除去較大的碎片,然后在充滿分散液的容器中放入兩個(gè)間距為0.4mm11/11--------
8、-------------------------------------------------------范文最新推薦------------------------------------------------------的共面鋁電極。因?yàn)樘技{米籠有電各向異性這一特征