期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 283, 期 2-3, 页码 258-262出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2004.05.031
关键词
magnetic colloid; coprecipitation; nanoparticles; magnetization; dispersion
Ultrafine well-dispersed magnetic nanoparticles were directly prepared in aqueous solution using controlled coprecipitation method. The structure, size, size distributions and magnetic properties of the magnetic nanoparticles, characterized by TEM, XRD and VSM, indicated the formation of single domain nanoparticles with average size smaller than 5 nm. The magnetic nanoparticles show superparamagnetism and a lower saturation magnetization is found as a consequence of smaller particle size. The relevant conditions for obtaining these magnetic colloids are discussed and the so-prepared magnetic nanoparticles are stable in a wide pH range. (C) 2004 Elsevier B.V. All rights reserved.
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