Nanoscale assembly of amine functionalized colloidal iron oxide.
Nanoscale assembly of amine functionalized colloidal iron oxide.
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DOI:
10.1016/j.jmmm.2009.02.080
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发表时间:
2009-05
影响因子:
2.7
通讯作者:
Bahadur D
中科院分区:
文献类型:
--
作者:
Barick KC;Aslam M;Prasad PV;Dravid VP;Bahadur D
We demonstrate a single-step facile approach for highly water stable assembly of amine-functionalized Fe3O4 nanoparticles using thermal decomposition of Fe-chloride precursors in ethylene glycol medium in the presence of ethylenediamine. The average size of nanoassemblies is 40±1 nm, wherein the individual nanoparticles are about 6 nm. Amine functionalized properties are evident from FTIR, thermal and elemental analysis. The saturation magnetization and spin-echo r2 of the nanoassemblies were measured to be 64.3 emu/g and 314.6 mM-1s-1, respectively. The higher value of relaxivity ratio (r2/r1=143) indicates that nanoassemblies are a promising high efficiency T2 contrast agent platform.
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