Nanoscale assembly of amine-functionalized colloidal iron oxide

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• 作者：K.C. Barick ; M. Aslam ; Pottumarthi V. Prasad ; Vinayak P. Dravid ; Dhirendra Bahadur
• 关键词：Nanoparticle ; Nanoassembly ; MR contrast agent ; Surface functionalization ; Iron oxide
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2009
• 出版时间：May 2009
• 年：2009
• 卷：321
• 期：10
• 页码：1529-1532
• 全文大小：477 K

文摘

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 Fourier transform infrared spectrometer (FTIR), thermal and elemental analyses. The saturation magnetization and spin-echo r₂ of the nanoassemblies were measured to be 64.3 emu/g and 314.6 mM⁻¹ s⁻¹, respectively. The higher value of relaxivity ratio (r₂/r₁=143) indicates that nanoassemblies are a promising high-efficiency T2 contrast agent platform.