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Fe@Fe_3O_4纳米粒子在MRI/磁热治疗中的研究
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摘要
Fe@Fe_3O_4纳米粒子因其独特的磁学性质而被广泛关注。本文采用高温热解五羰基铁合成具有核壳结的Fe@Fe_3O_4纳米粒子,其中Fe核的直径为7.5±0.8 nm,其饱和磁化强度可达95 emu/g。我们采用配体交换的方法,利用2,3-二巯基丁二酸(DMSA)交换纳米粒子表面的配体,实现纳米粒子的水溶性,其水合粒径达到27.8 nm左右,且在二次水中具有良好的长期稳定性。溶液MRI测定表明,DMSA修饰的纳米粒子Fe@Fe_3O_4纳米粒子的r_2值高达228 s~(-1)·mM~(-1),可用于动物的核磁共振成像。而且,该纳米粒子具有良好的磁热效果,在60A,200 kHz的条件下,20 min内溶液的温度可以升高12℃,在活体磁热治疗中可以得到进一步的应用。
Fe@Fe_3O_4 nanoparticles have attracted tremendous attention from researchers in various disciplines for their unique magnetic properties.Herein,Fe@Fe_3O_4 nanoparticles were synthesized via the thermal decomposition of iron pentacarbonyl,with the diameter of iron core of ~7.5 nm and saturation magnetization of 95 emu/g at 300 K.The mean hydrodynamic diameter of Fe@Fe_3O_4 nanoparticles modified with DMSA was about 27.8 nm.They were well dispersed and stable in the water,and showed a high r_2 value of 228 s~(-1)·mM~(-1) for magnetic resonance imaging and good magnetic hyperthermia.Under the condition of 60 A and 200 kHz,the temperature could be raised 12 ℃ within 20 min.
引文
[1]Sheng,P.;Wang,C.;Xie,J.;Sun,SH.J.Am.Chem.Soc.2006,128,10676-10677.
    [2]Ruiz A.;Hern'andez Y.;Cabal C.;Gonz'alez E.;Morales M.P.Nanoscale 2013,5,11400-11408.
    [3]Lacroix,L.M.;Huls,N.F.;Ho,D.;Sun,X.L.;Cheng,K.;Sun,S.H.Nano Lett.2011,11,1641-1645.

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