Department of Materials Science and Engineering, 201 DuPont Hall, University of Delaware, Newark, DE 19716, USA.
Nanotechnology. 2010 Feb 26;21(8):85707. doi: 10.1088/0957-4484/21/8/085707. Epub 2010 Jan 25.
A modified electrospinning process has been utilized to align magnetite (Fe(3)O(4)) nanoparticles inside highly oriented poly(ethylene oxide) nanofibers. The structural characterization of the fiber encapsulated nanoparticle arrays via electron microscopy has been detailed, and the magnetic behavior has been studied using vibrating sample magnetometry. The fiber encapsulated nanoparticle arrays exhibit orientation-dependent magnetic behavior with respect to the applied magnetic field. A strong anisotropy along orthogonal axes is obtained for aligned arrays and is manifested as a notable increase in the coercivity and remanence magnetization in the parallel field configuration. The magnetic behavior of isotropic fibers is also examined as a reference and no orientation dependence is observed. The results were found to corroborate theoretical predictions from the chain-of-spheres model. Such hybrid nanoparticle arrays may find relevance in applications requiring an orientation-dependent physical response and in the directional transfer of signals.
一种改进的静电纺丝工艺被用来在高度取向的聚氧化乙烯纳米纤维内部对齐磁铁矿（Fe3O4）纳米粒子。通过电子显微镜详细描述了纤维封装纳米粒子阵列的结构特征，并通过振动样品磁强计研究了其磁性。纤维封装纳米粒子阵列表现出与外加磁场有关的取向依赖性磁行为。对于对齐的阵列，在正交轴上获得了强各向异性，并表现为在平行场配置下矫顽力和剩余磁化强度的显著增加。各向同性纤维的磁性行为也被作为参考进行了研究，没有观察到取向依赖性。结果与链球模型的理论预测相符。这种混合纳米粒子阵列可能在需要依赖于取向的物理响应和信号的定向传输的应用中具有相关性。
