梯度密度离心分离磁性纳米颗粒

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1、JournalofChromatographyA,1218(2011)3823–3829ContentslistsavailableatScienceDirectJournalofChromatographyAjournalhomepage:www.elsevier.com/locate/chromaSeparationofnanorodsbydensitygradientcentrifugationBinXiong,JingCheng,YanxiaQiao,RuiZhou,YanHe∗,EdwardS.YeungCollegeofChemistryandChemicalEnginee

2、ring,CollegeofBiology,StateKeyLaboratoryofChemo/BiosensingandChemometrics,HunanUniversity,Changsha410082,ChinaarticleinfoabstractArticlehistory:Theexperimentalconditionsnecessaryforthesynthesisofwell-definednanoparticlesareoftendifficultReceived26December2010tocontrol.Thereisthusacompellingneedfor

3、post-synthesisseparationofnanoparticlespolydispersedReceivedinrevisedform11April2011insizeandshape.WedemonstratehereboththeoreticallyandexperimentallythatgoldnanorodswithAccepted12April2011diverseaspectratioscanbeseparatedusingdensitygradientcentrifugation.Byanalysingtheforcebal-Availableonline2

4、0April2011anceofaBrownianrodfallinginaStokesflow,wederivearigorousandpredictivemodelthatrevealsthequantitativedependencyofthenanorodsedimentationratesontheirmassandshape.ThecalculationsKeywords:showthatwhilemassdependencyisstillthedominatingfactorduringcentrifugation,theshapefactorGoldnanoparticl

5、eisnotinsignificant.RelativelyheavierbutlongandthinrodscouldsedimentslowerthancertainsizeofNanorodsSeparationlighterspheres,andsomerodsandsphereswithdifferentmassesandshapesmayneverbeseparated.DensitygradientcentrifugationThismassandshapedependencyisexploitedtoseparateas-preparedgoldnanorodcolloi

6、dsbysucrosegradientcentrifugation.Twolayersofnanorodswithnarrowaspect-ratiodistributionsareobtained.©2011ElsevierB.V.Allrightsreserved.1.Introductionchemicallymodifiedgrapheneusingsucrosegradientsolution.Chen[15]isolatedgoldnanoparticledimersandtrimersbycen-Nanometer-sizedparticlesshowuniquephysi

7、calandchemicaltrifugationwithhighdensityCsCl2solutions.Bai[18]exploitedpropertiesthataredifferentfromthoseofbulkmaterialsdepend-aneffectivemethodforrapidseparationandpurificationofmetalingontheirsizesandshapesduetothequantumc