Superparamagnetic polymer nanocomposites with uniform Fe3O4 nanoparticle dispersions
Superparamagnetic polymer nanocomposites with uniform Fe3O4 nanoparticle dispersions
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DOI：
10.1002/adfm.200500335
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发表时间：
2006-01-05
影响因子：
19
通讯作者：
Srikanth, H
中科院分区：
文献类型：
--
作者：
Gas, J;Poddar, P;Srikanth, H
嵌入聚合物基质中的磁性纳米颗粒是功能纳米结构的良好例子，在电磁干扰屏蔽、磁光存储、生物医学传感、柔性电子等领域具有巨大的应用潜力。控制嵌入聚合物基质中的纳米颗粒相的分散性至关重要，而且往往具有挑战性。为了实现优异的分散性，必须平衡聚合物-聚合物和聚合物-颗粒相互作用之间的竞争，以避免聚合物纳米复合材料中的颗粒聚集。我们报告了使用旋涂从溶液中首次沉积磁性纳米复合材料聚（甲基丙烯酸甲酯）/聚吡咯双层。 Fe3O4 纳米颗粒是采用化学共沉淀法合成的。通过结合溶解聚合物和混合脂肪酸表面活性剂涂覆的 Fe3O4 纳米颗粒，我们已经证明了具有均匀纳米颗粒分散体的纳米复合材料的形成。横截面扫描电子显微镜、透射电子显微镜和磁性测量证实了其优异的色散和超顺磁响应。还介绍并分析了这些双层的低频阻抗测量。
Magnetic nanoparticles embedded in polymer matrices are good examples of functional nanostructures with excellent potential for applications such as electromagnetic interference shielding, magneto-optical storage, biomedical sensing, flexible electronics, etc. Control over the dispersion of the nanoparticle phase embedded in a polymer matrix is critical and often challenging. To achieve excellent dispersion, competition between polymer-polymer and polymer-particle interactions have to be balanced to avoid clustering of particles in polymer nanocomposites. We report the first deposition of magnetic nanocomposite poly(methyl methacrylate)/polypyrrole bilayers from solution using spin-coating. Fe3O4 nanoparticles have been synthesized using a chemical co-precipitation route. Using a combination of dissolving the polymer and mixing fatty acid surfactant coated Fe3O4 nanoparticles, we have demonstrated the formation of nanocomposites with uniform nanoparticle dispersion. Cross-sectional scanning electron microscopy, transmission electron microscopy, and magnetic measurements confirm the excellent dispersion and superparamagnetic response. Low-frequency impedance measurements on these bilayers are also presented and analyzed.