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Initial susceptibility and viscosity properties of low concentration ε-Fe3N based magnetic fluid

Wei Huang*, Jianmin Wu, Wei Guo, Rong Li and Liya Cui

Author Affiliations

Department of Functional Material Research, Central Iron & Steel Research Institute, Beijing, 100081, P. R. China

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Nanoscale Research Letters 2007, 2:155-160  doi:10.1007/s11671-007-9047-7

Published: 13 March 2007


In this paper, the initial susceptibility of ε-Fe3N magnetic fluid at volume concentrations in the range Φ = 0.0 ∼ 0.0446 are measured. Compared with the experimental initial susceptibility, the Langevin, Weiss and Onsager susceptibility were calculated using the data obtained from the low concentration ε-Fe3N magnetic fluid samples. The viscosity of the ε-Fe3N magnetic fluid at the same concentrations is measured. The result shows that, the initial susceptibility of the low concentration ε-Fe3N magnetic fluid is proportional to the concentration. A linear relationship between relative viscosity and the volume fraction is observed when the concentration Φ < 0.02.

Magnetic fluid; Nano-material; Initial susceptibility; Viscosity