✦ LIBER ✦

Preparation of Dy-ferrite Ferrofluids and Magnetochemical Studies on the Superparamagnetism

✍ Scribed by Xian-Luo Hu; Chao Xu; Qin Shen; Yi-Wei Chen; Hong Zhao; Chuan-Zheng Zhu

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 390 KB
Volume: 19
Category: Article
ISSN: 0256-7660
DOI: 10.1002/cjoc.20010190805

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

This paper reports unprecedented preparation of Dy‐ferrite water‐based ferrofluids stabilized by polymeric surfactant PMAA. The stability of ferrofluids was characterized in terms of the equation of criterion for the stability of ferrofluids. Magnetic susceptibility was measured with a Faraday‐type magnetic balance at different temperature and with different magnetic field intensity. According to the Langevin function, superparamagnetism of Dy‐ferrite ferrofluids has been confirmed by the curves of saturation magnetization σ versus H/ T, and the blocking temperature is between 160 and 200 K. In terms of the simplified Langevin function in the low magnetic field, the average particle size is 20 nm that coincides with the result evaluated by FHMW. In addition, chemical analysis, infrared spectra and Mossbauer spectroscopy were utilized to analyze the main components of the ferrofluids.

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