A simple route to synthesize ZnFe2O4 hollow spheres and their magnetorheological
characteristics

doi:10.1088/0964-1726/18/12/125013

A simple route to synthesize ZnFe₂O₄ hollow spheres and their magnetorheological characteristics

Wanquan Jiang et al 2009 Smart Mater. Struct. 18 125013 (4pp) doi: 10.1088/0964-1726/18/12/125013

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Wanquan Jiang^1,3, Zhen Cao¹, Rui Gu², Xingzhu Ye², Cuifeng Jiang¹ and Xinglong Gong^2,3
¹ Department of Chemistry, USTC, Hefei 230026, People's Republic of China
² CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, USTC, Hefei 230027, People's Republic of China
³ Authors to whom any correspondence should be addressed
E-mail: jiangwq@ustc.edu.cn and gongxl@ustc.edu.cn

Abstract. In this paper, a simple route to synthesize hollow spheres of ZnFe₂O₄ without the assistance of a template is reported. The crystal structure and morphology of these particles were characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), and field emission scanning electron microscopy (FE-SEM). It was found that the final products were hollow spheres with perfect morphology, and their size and the thickness of their shells decreased with the increase of urea precursor. Ferromagnetism was observed from the magnetic hysteresis loops of the ZnFe₂O₄ hollow spheres at room temperature. The possible formation mechanism of the hollow spheres is discussed. In addition, ZnFe₂O₄ magnetorheological (MR) fluids were prepared and then their MR effect was investigated on a rotational rheometer equipped with a magnetic field generator.

Print publication: Issue 12 (December 2009)
Received 3 July 2009, in final form 3 September 2009
Published 6 October 2009

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A simple route to synthesize ZnFe₂O₄ hollow spheres and their magnetorheological characteristics

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