Initial susceptibility and viscosity properties of low concentration ε-Fe3N based magnetic fluid
Department of Functional Material Research, Central Iron & Steel Research Institute, Beijing, 100081, P. R. China
Nanoscale Research Letters 2007, 2:155-160 doi:10.1007/s11671-007-9047-7Published: 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.