期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 282, 期 -, 页码 147-150出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2004.04.035
关键词
maghemite; superparamagnetism; piezoelectric nozzle method
We have synthesized the maghemite (gamma-Fe2O3) nanoparticles by a chemical coprecipitation technique of ferric and ferrous ions in alkali solution through the pipette drop method (pipette diameter: 2000 mum) and the piezoelectric nozzle method (nozzle size: 50 mum). The microstructures of nanoparticles were characterized by X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The size distribution of the maghemite nanoparticles prepared by typical pipette drop method is from 5 to 8 nm. However, the nanoparticles made by piezoelectric nozzle method shows a small size and a very narrow size distribution from 3 to 5 nm. Zero-field-cooling (ZFC) and field-cooling (FC) magnetization measurements were performed using a superconducting quantum interference device magnetometer from 2 to 300 K to investigate the magnetic properties of nanoparticles. The FC/ZFC magnetization measurements showed a typical superparamagnetic behavior with very narrow size distribution. (C) 2004 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据