期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 306, 期 2, 页码 241-247出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2006.03.069
关键词
magnetic microspheres; nanoparticles; maghemite; magnetic properties
Magnetic poly(glycidyl methacrylate) (PGMA) microspheres were prepared by emulsion polymerization of glycidyl methacrylate (GMA) in the presence of (carboxymethyl)dextran (CM-dextran)-stabilized iron oxide colloid. Scanning electron microscope (SEM) and transmission electron microscope (TEM) microstructural studies revealed a spherical shape of the particles in 72-84 nm size range. Magnetic iron oxide nanoparticles (< 10 nm) were partly inside the PGMA microspheres and partly adhering to the microsphere surface. X-ray phase analysis revealed spinel structure of the iron oxide particles. According to the Mossbauer spectra, iron oxide consisted mainly of the maghemite phase. Temperature evolution of the spectra completed by the magnetization measurements confirmed superparamagnetic behavior at room temperature and the transition to the ordered state at lower temperatures. As expected, saturated magnetization increased with increasing content of the maghemite phase in the magnetic PGMA microspheres. (C) 2006 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