Inter-particle and interfacial interaction of magnetic nanoparticles
Inter-particle and interfacial interaction of magnetic nanoparticles
复制标题
DOI：
10.1016/j.jmmm.2006.10.746
复制
发表时间：
2007-03-01
影响因子：
2.7
通讯作者：
Park, J.-G.
中科院分区：
文献类型：
--
作者：
Bae, Che Jin;Hwang, Yosun;Park, J.-G.
为了理解磁性纳米粒子之间以及界面间的相互作用，我们制备了粒径在3到50纳米范围内的几种四氧化三铁纳米粒子。这些纳米粒子在尺寸分布方面具有良好的特性，其尺寸的标准偏差（σ）小于0.4纳米。我们通过用溶剂稀释样品来控制粒子间距离，同时测量纳米粒子的磁性来研究粒子间的相互作用。根据这项研究，当粒子间距离从几纳米增加到140纳米时，阻塞温度下降了8 - 17开尔文，而磁化的整体形状和定性行为保持不变。这意味着在纳米粒子磁性中观察到的大多数特征是由于纳米粒子的固有特性，而非粒子间的相互作用。然后我们研究了我们的四氧化三铁纳米粒子核 - 壳结构中可能存在的界面磁性相互作用。（C）2006爱思唯尔有限公司。保留所有权利。
In order to understand inter-particle as well as interfacial interaction of magnetic nanoparticles, we have prepared several Fe3O4 nanoparticles in the ranges from 3 to 50 nm. These nanoparticles are particularly well characterized in terms of size distribution with a standard deviation (sigma) in size less than 0.4 nm. We investigated the inter-particle interaction by measuring the magnetic properties of the nanoparticles while controlling inter-particle distances by diluting the samples with solvents. According to this study, blocking temperatures dropped by 8-17 K with increasing the inter-particle distances from a few nm to 140 nm while the overall shape and qualitative behavior of the magnetization remain unchanged. It implies that most features observed in the magnetic properties of the nanoparticles are due to the intrinsic properties of the nanoparticles, not due to the inter-particle interaction. We then examined possible interfacial magnetic interaction in the core-shell structure of our Fe3O4 nanoparticles. (C) 2006 Elsevier B.V. All rights reserved.