Preparation of PMAA-coated Dysprosium Ferrite Ferrofluids and Study on the Superparamagnetism

Chemical Research in Chinese Universities ›› 2002, Vol. 18 ›› Issue (1): 30-33.

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Preparation of PMAA-coated Dysprosium Ferrite Ferrofluids and Study on the Superparamagnetism

ZHU Chuan-zheng, SHEN Qin, HU Xian-luo, ZHANG Jie, ZHAO Hong

Department of Chemistry, East China Normal University, Shanghai 200062, P. R. China

Received:2000-10-10 Online:2002-01-24 Published:2011-08-04
Supported by:
Supported by the National Natural Science Foundation of China(No.29773014).

Abstract

Abstract: The present paper covers the unprecedented preparation of stable aqueous Dy-ferrite ferrofluids, whereby colloidal Dy_δFe₃-_δO₄ ultrafine particles were dispersed by using polymeric surfactant PMAA. The stabilities of the series of the ferrofluids were studied according to the stability indexes. The susceptibility measurements were made with a Farady-type magnetic balance at various temperatures and magnetic field intensities. In terms of Langevin function, the σ versus H/T curves showed that Dy-ferrite ferrofluids exhibited superparamagnetism behavior and the blocking temperatures were in the range from 160 to 200 K. Moreover, the ferrofluids were characterized by means of Infra-red spectroscopy, transmission electron microscopy, X-ray diffraction, and Mössbauer spectroscopy.

Key words: Dy-ferrite ferrofluid, Susceptibility, Superparamagnetism, Stability, PMAA

ZHU Chuan-zheng, SHEN Qin, HU Xian-luo, ZHANG Jie, ZHAO Hong. Preparation of PMAA-coated Dysprosium Ferrite Ferrofluids and Study on the Superparamagnetism[J]. Chemical Research in Chinese Universities, 2002, 18(1): 30-33.

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Preparation of PMAA-coated Dysprosium Ferrite Ferrofluids and Study on the Superparamagnetism

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