Room temperature magnetic materials from nanostructured diblock copolymers
Room temperature magnetic materials from nanostructured diblock copolymers
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DOI：
10.1038/ncomms1485
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发表时间：
2011-09-01
影响因子：
16.6
通讯作者：
Tew, Gregory N.
中科院分区：
文献类型：
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作者：
Al-Badri, Zoha M.;Maddikeri, Raghavendra R.;Tew, Gregory N.
纳米磁性材料在许多先进的应用中都很重要。因此，制造它们的新方法至关重要。然而，以一种简单、直接的方式将自组装耦合到磁性材料的产生仍然是难以捉摸的。虽然已经考虑了几种方法，但大多数方法都有多个处理步骤，从而减少了它们使用自组装来影响磁性能。在这里，我们开发了新型嵌段共聚物，该共聚物预先编程了必要的化学信息，以微相分离并在简单的热处理后提供室温铁磁性能。与母体均聚物相比，纳米结构约束的重要性得到了证明，母体均聚物只提供顺磁性材料，即使它的化学性质相同并且具有更高的磁性前驱体负载。除了源于嵌段共聚物的室温铁磁特性外，原位生成的磁性元件表面密集功能化，使其氧化稳定。
Nanostructured magnetic materials are important for many advanced applications. Consequently, new methods for their fabrication are critical. However, coupling self-assembly to the generation of magnetic materials in a simple, straight-forward manner has remained elusive. Although several approaches have been considered, most have multiple processing steps, thus diminishing their use of self-assembly to influence magnetic properties. Here we develop novel block copolymers that are preprogrammed with the necessary chemical information to microphase separate and deliver room temperature ferromagnetic properties following a simple heat treatment. The importance of the nanostructured confinement is demonstrated by comparison with the parent homopolymer, which provides only paramagnetic materials, even though it is chemically identical and has a higher loading of the magnetic precursor. In addition to the room temperature ferromagnetic properties originating from the block copolymer, the in situ generation densely functionalizes the surface of the magnetic elements, rendering them oxidatively stable.