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Magnetomicelles:Composite NanostructuresfromMagnetic NanoparticlesandCross-Linked AmphiphilicBlockCopolymers Byeong-SuKim, Jiao-MingQiu, Jian-PingWang, andT.AndrewTaton* NANO LETTERS 2005 Vol.5,No.10 1987-1991 Wehaveevaluatedthisnoncovalentencapsulationmethod successfullyforvariousironoxidenanoparticles,including 27 differentsizesof-FeO (d ) 3.8,6.3,10.4nm)aswell 2 3 41as FeO (d ) 5.6nm),withinPS -b-PAA (Figure5). 3 4 250 13 Inallofthesecases,thehydrophobicmicellecoresphysically isolatedtheencapsulatedparticlesfromtheiraqueous environment.Totestthepermeabilityofthepolymershell, O were magnetomicellescontaining10.9nmdiameter-Fe 2 3 resuspendedinaqueousHCl(pH2),aknownetchantfor Figure3. SQUIDM-Hcurvemeasurementsonmagnetomicelles 42,43 ironoxide. |
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