胺功能化胶体氧化铁的纳米级组装。
Nanoscale assembly of amine functionalized colloidal iron oxide.
作者信息
Barick K C, Aslam M, Prasad Pottumarthi V, Dravid Vinayak P, Bahadur Dhirendra
机构信息
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, India.
出版信息
J Magn Magn Mater. 2009 May;321(10):1529-1532. doi: 10.1016/j.jmmm.2009.02.080.
Abstract
We demonstrate a single-step facile approach for highly water stable assembly of amine-functionalized Fe(3)O(4) 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 r(2) 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 (r(2)/r(1)=143) indicates that nanoassemblies are a promising high efficiency T2 contrast agent platform.
摘要
我们展示了一种一步简便方法，通过在乙二胺存在下，于乙二醇介质中热分解铁氯化物前体，来实现胺功能化的Fe(3)O(4)纳米颗粒的高度水稳定组装。纳米聚集体的平均尺寸为40±1纳米，其中单个纳米颗粒约为6纳米。FTIR、热分析和元素分析表明胺功能化特性明显。纳米聚集体的饱和磁化强度和自旋回波r(2)分别测得为64.3 emu/g和314.6 mM(-1)s(-1)。较高的弛豫率值（r(2)/r(1)=143）表明纳米聚集体是一个有前景的高效T2造影剂平台。
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