Direct control of the magnetic interaction between iron oxide nanoparticles through dendrimer-mediated self-assembly
Direct control of the magnetic interaction between iron oxide nanoparticles through dendrimer-mediated self-assembly
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DOI：
10.1021/ja051351m
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发表时间：
2005-07-13
影响因子：
15
通讯作者：
Rotello, VM
中科院分区：
文献类型：
--
作者：
Frankamp, BL;Boal, AK;Rotello, VM
阳离子超顺磁性氧化铁纳米粒子组装使用一系列阴离子聚酰胺胺树枝状聚合物。所得组件的特点是系统地增加平均粒子间间距在2.4 nm的范围内，增加树枝状聚合物代。这种间距的增加通过有效降低粒子之间的偶极耦合来调制集体磁性行为。在这些研究中获得的结果偏离预测的依赖性集体行为的粒子间的间距，这表明一个致密的组装的磁性“自由”的粒子可以存在一个令人惊讶的小粒子之间的空间。
Cationic superparamagnetic iron oxide nanoparticles were assembled using a series of anionic polyamicloamine dendrimers. The resulting assemblies featured systematically increasing average interparticle spacing over a 2.4 nm range with increasing dendrimer generation. This increase in spacing modulated the collective magnetic behavior by effective lowering of the dipolar coupling between particles. The results obtained in these studies deviate from the predicted dependence of collective behavior on interparticle spacing, suggesting that a dense assembly of magnetically "free" particles can exist with a surprisingly small space between particles.