Magnetomicelles: Composite nanostructures from magnetic nanoparticles and cross-linked amphiphilic block copolymers
Magnetomicelles: Composite nanostructures from magnetic nanoparticles and cross-linked amphiphilic block copolymers
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DOI：
10.1021/nl0513939
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发表时间：
2005-10-01
期刊：
影响因子：
10.8
通讯作者：
Taton, TA
中科院分区：
文献类型：
--
作者：
Kim, BS;Qiu, JM;Taton, TA
我们报告的合成，表征和共价表面化学的“磁胶束”，交联，两亲性嵌段共聚物胶束，封装超顺磁性氧化铁纳米粒子。因为这些复合纳米结构通过纳米颗粒和两亲性聚（苯乙烯（250）-嵌段-丙烯酸（13））组分的同时去溶剂化从溶液自发地组装，所以不需要颗粒的明确表面官能化，并且将封装方法应用于不同的磁性纳米颗粒尺寸和组合物。磁胶束的TEM图像表明，包裹颗粒的数量可以由合成条件合理决定。用SQUID磁强计对样品的磁性能进行了表征，并遵循超顺磁性材料的一般Langevin磁性模型。这些颗粒的胶束壳使用共价化学进行官能化，这在磁性颗粒表面通常是不可能的。因此，这种非共价方法为缺乏适当共轭表面化学的疏水磁性纳米材料的技术应用提供了新的途径。
We report the synthesis, characterization, and covalent surface chemistry of "magnetomicelles", cross-linked, amphiphilic block-copolymer micelles that encapsulate superparamagnetic iron oxide nanoparticles. Because these composite nanostructures assemble spontaneously from solution by simultaneous desolvation of nanoparticle and amphiphilic poly(styrene(250)-block-acrylic acid(13)) components, explicit surface functionalization of the particles is not required, and the encapsulation method was applied to different magnetic nanoparticle sizes and compositions. TEM images of the magnetomicelles illustrated that the number of encapsulated particles could be dictated rationally by synthetic conditions. The magnetic properties of the particles were characterized by SQUID magnetometry and followed the general Langevin magnetic model for superparamagnetic materials. The micellar shells of these particles were functionalized using covalent chemistry that would not ordinarily be possible on the magnetic particle surface. As a result, this noncovalent approach provides a new route to technological applications of hydrophobic magnetic nanomaterials that lack appropriate conjugate surface chemistry.