Stabilization and controlled association of superparamagnetic nanoparticles using block copolymers
Stabilization and controlled association of superparamagnetic nanoparticles using block copolymers
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DOI：
10.1016/j.jmmm.2008.11.021
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发表时间：
2009-04-01
影响因子：
2.7
通讯作者：
Sandre, Olivier
中科院分区：
文献类型：
--
作者：
Frka-Petesic, Bruno;Fresnais, Jerome;Sandre, Olivier
在水溶液中混合具有相反电荷的物质的聚电解质-中性嵌段共聚物，自发地形成稳定的核-壳复合物，其被静电驱动。我们在这里报告的结构和取向性质的磁性氧化铁纳米粒子（MNP）和聚电解质中性嵌段共聚物制成的混合磁性纳米团簇。小角中子散射和透射电子显微镜实验允许探测内核纳米颗粒组织，导致平均粒子间距离和确认的层次内部结构的集群。由于MNP的光学各向异性，我们还探讨了磁场下的核壳团簇的取向性质和它们的动力学旋转弛豫。(C)2008年爱思唯尔B。V.保留所有权利。
Mixing in aqueous solutions polyelectrolyte-neutral block copolymers with oppositely charged species, spontaneously forms stable core-shell complexes, which are electrostatically driven. We report here on the structural and orientational properties of such mixed magnetic nanoclusters made of magnetic iron oxide nanoparticles (MNPs) and polyelectrolyte-neutral block copolymers. Small angle neutron scattering and transmission electron microscopy experiments allows to probe the inner-core nanoparticle organization, leading to an average interparticle distance and confirming the hierarchical internal structure of the clusters. Thanks to the MNP optical anisotropy, we also probe the under-magnetic field orientational properties of the core-shell clusters and their dynamical rotational relaxation. (C) 2008 Elsevier B. V. All rights reserved.