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2005
Magnetomicelles:Composite
Vol.5,No.10
1987-1991
NanostructuresfromMagnetic
NanoparticlesandCross-Linked
AmphiphilicBlockCopolymers
? ? ? ,?
Byeong-SuKim,
Jiao-MingQiu, Jian-PingWang, andT.AndrewTaton*
DepartmentofChemistryandDepartmentofElectricalandComputerEngineering,
UniVersityofMinnesota,207PleasantStreetSE,Minneapolis,Minnesota55455
ReceivedJuly19,2005;RevisedManuscriptReceivedAugust30,2005
ABSTRACT
Wereportthesynthesis,characterization,andcovalentsurfacechemistryof!àmagnetomicelles!–,cross-linked,amphiphilicblock-copolym
micellesthatencapsulatesuperparamagneticironoxidenanoparticles.Becausethesecompositenanostructuresassemblespontaneously
fromsolutionbysimultaneousdesolvationofnanoparticleandamphiphilicpoly(styrene
-block-acrylicacid )components,explicitsurface
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functionalizationoftheparticlesisnotrequired,andtheencapsulationmethodwasappliedtodifferentmagneticnanoparticlesizesand
compositions.TEMimagesofthemagnetomicellesillustratedthatthenumberofencapsulatedparticlescouldbedictatedrationallybysynthetic
conditions.ThemagneticpropertiesoftheparticleswerecharacterizedbySQUIDmagnetometryandfollowedthegeneralLangevinmagnetic
modelforsuperparamagneticmaterials.Themicellarshellsoftheseparticleswerefunctionalizedusingcovalentchemistrythatwouldnot
ordinarilybepossibleonthemagneticparticlesurface.Asaresult,thisnoncovalentapproachprovidesanewroutetotechnologicalapplications
ofhydrophobicmagneticnanomaterialsthatlackappropriateconjugatesurfacechemistry. |
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