论文信息 - The influence of the concentration of ferroparticles in a ferrofluid on its magnetic and acoustic properties

The influence of the concentration of ferroparticles in a ferrofluid on its magnetic and acoustic properties

This paper reports results of a study of magnetic and acoustic properties of a ferrofluid, EMG-605. The measurements were performed for three samples of the same ferrofluid differing in concentration. The magnetic susceptibility was measured as a function of an external magnetic field for each sample, which allowed us to determine the magnetization curves and saturation magnetization. The results provide information on the mean magnetic moment and the mean radius of the magnetite grain. In the samples subjected to an external magnetic field, the anisotropy of the ultrasonic wave absorption coefficient was determined. The mechanisms of ultrasonic wave energy dissipation through the translational and rotational degrees of freedom were established for some ferrofluid concentrations.

A. Józefczak | A. Skumiel | T. Hornowski | M. Labowski

[1] Mario Liu,et al. Sound damping in ferrofluids: magnetically enhanced compressional viscosity. , 2002, Physical review. E, Statistical, nonlinear, and soft matter physics.

[2] A. Philipse,et al. Susceptibility measurements on a fractionated aggregate-free ferrofluid , 2002 .

[3] Pere Losantos,et al. The use of ferrofluids in micromechanics , 2000 .

[4] J. Bacri,et al. Biomedical applications of maghemite ferrofluid. , 1998, Biochimie.

[5] A. Skumiel,et al. The effect of magnetic field on the anisotropy of the ultrasonic attenuation in magnetic liquids , 1997 .

[6] A. Skumiel,et al. Investigation of the ultrasonic propagation velocity anisotropy in magnetic liquids in a constant magnetic field , 1996 .

[7] A. Pshenichnikov. Equilibrium magnetization of concentrated ferrocolloids , 1995 .

[8] H. Brand,et al. The anisotropy of the macroscopic equations for ferrofluids and a comparison with experimental results on ultrasound , 1990 .

[9] S. Taketomi. The anisotropy of the sound attenuation in magnetic fluid under an external magnetic field , 1986 .

[10] D. Chung,et al. Ultrasonic Attenuations in Magnetic Fluids , 1984 .

[11] W. Isler,et al. Ultrasonic velocity anisotropy in ferrofluids under the influence of a magnetic field , 1978 .

[12] J. D. Parsons. Sound velocity in a magnetic fluid , 1975 .

[13] P. Gennes,et al. The physics of liquid crystals , 1974 .