Magnetic and rheological properties of monodisperse Fe3O4 nanoparticle/organic hybrid
Magnetic and rheological properties of monodisperse Fe3O4 nanoparticle/organic hybrid
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DOI：
10.1016/j.jmmm.2008.10.004
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发表时间：
2009-03-01
影响因子：
2.7
通讯作者：
Yogo, Toshinobu
中科院分区：
文献类型：
--
作者：
Hayashi, Koichiro;Sakamoto, Wataru;Yogo, Toshinobu
Fe3O4纳米颗粒/有机杂化物通过使用乙酰丙酮铁（III）在-80 ℃下水解来合成。通过X射线衍射、选区衍射和X射线光电子能谱证实了Fe3O4的合成。在有机基质中的Fe_3O_4纳米粒子的直径范围为7 - 13nm，这取决于水解条件。杂化材料的饱和磁化强度随粒径的增大而增大。当混合物含有尺寸小于10 nm的Fe 3 O4颗粒时，它表现出超顺磁行为。含粒径为7.3 nm的Fe3O4颗粒的杂化材料的阻断温度为200 K，随着粒径增加到9.1 nm，阻断温度增加到310 K。当Fe_3O_4颗粒尺寸大于10 nm时，其杂化材料具有亚铁磁性，并在130 K发生Verwey转变。在磁场作用下，杂化物在硅油中的悬浮液显示了磁流变效应。流体的屈服应力取决于混合物中Fe3O4纳米颗粒的饱和磁化强度、磁场强度和混合物的量。(c)2008年爱思唯尔B。版权所有© 2016
Fe3O4 nanoparticle/organic hybrids were synthesized via hydrolysis using iron (III) acetylacetonate at -80 degrees C. The synthesis of Fe3O4 was confirmed by X-ray diffraction, selected-area diffraction, and X-ray photoelectron spectroscopy. Fe3O4 nanoparticles in the organic matrix had diameters ranging from 7 to 13nm depending on the conditions of hydrolysis. The saturation magnetization of the hybrid increased with an increase in the particle size. When the hybrid contained Fe3O4 particles with a size of less than 10 nm, it exhibited superparamagnetic behavior. The blocking temperature of the hybrid containing Fe3O4 particles with a size of 7.3 nm was 200 K, and it increased to 310 K as the particle size increased to 9.1 nm. A hybrid containing Fe3O4 particles of size greater than 10 nm was ferrimagnetic, and underwent Verwey transition at 130 K. Under a magnetic field, a suspension of the hybrid in silicone oil revealed the magnetorheological effect. The yield stress of the fluid was dependent on the saturation magnetization of Fe3O4 nanoparticles in the hybrid, the strength of the magnetic field, and the amount of the hybrid. (c) 2008 Elsevier B. V. All rights reserved.