Nonpolar Solvothermal Fabrication and Electromagnetic Properties of Magnetic Fe3O4 Encapsulated Semimetal Bi Nanocomposites

Nonpolar Solvothermal Fabrication and Electromagnetic Properties of Magnetic Fe3O4 Encapsulated Semimetal Bi Nanocomposites
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磁性 Fe3O4 封装半金属 Bi 纳米复合材料的非极性溶剂热制备及其电磁性能

DOI:
10.1021/cg300198r
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发表时间:
2012-06
期刊:
Crystal Growth & Design
影响因子:
--
通讯作者:
Zhang, Z.D.
Zhang, Z.D.
中科院分区:
其他
文献类型:
--
作者:
Zhang, Q.;Zhao, X.G.;Ma, S.;Zhang, Z.D.

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以非极性 1-十八碳烯为基础,通过溶剂热法制备了磁性 Fe3O4 纳米颗粒 (NPs) 封装的半金属 Bi 纳米复合材料。 Bi 和 Fe 离子通过与所制备的溶液中的油酸钠络合物引入到油相中。通过油酸表面改性,纳米复合材料具有油溶性,并且在任何非极性溶液中均能良好分散。有人认为,羟基作为还原剂会诱导 Bi 微球的形成,并防止 Fe3O4 纳米颗粒氧化。复介电常数和磁导率的频率依赖性表明 Bi/Fe3O4 纳米复合材料的 Bi 和界面极化是介电共振的原因,而超顺磁性 Fe3O4 纳米粒子削弱了自然共振。
Magnetic Fe3O4 nanoparticles (NPs) encapsulated semimetal Bi nanocomposites were fabricated by a solvothermal method based on the nonpolar 1-octadecene. Bi and Fe ions were introduced into the oil phase by the complex with sodium oleate in the as-prepared solution. The nanocomposites were oil soluble and dispersed well in any nonpolar solution with the surface modification of oleic acid. It is argued that hydroxyl groups as the reductant induce the formation of Bi microspheres and prevent Fe3O4 NPs from oxidation. The frequency dependence of complex permittivity and permeability indicates that Bi and interface polarization of Bi/Fe3O4 nanocomposites are responsible for the dielectric resonances, and superparamagnetic Fe3O4 NPs weaken the natural resonance.
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