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2 Molecular and Quantum Acoustics

2 2003

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Magnetic and Acoustic Properties of Water-Based Ferrofluids

Skumiel A., Soczkiewicz M.

Molecular and Quantum Acoustics

2003

Vol. 24

149-160

The fundamental magnetic and acoustic properties of the magnetic grain on the basis of the low-frequency measurements of magnetic susceptibility os proposed and its tesults are compared with those obtained by transmission electrone microscope (TEM). The acoustic part is devoted to analysis of the anisotropy of absorption coefficient of the ultrasonic wave in ferrofluids of different concentrations of the solid phase. On the basis of the fit of the Taketomi function to the experimental data some information on the ferrofluid structure in a magnetic field have been obtained. Structural changes in the ferrofluid upon formation and decay of magnetic clusters can be traced on the basis fo results of measurements of ultrasound absorption coefficient and propagation velocity in a slowly changing magnetic field.

Distribution of Relaxation Times in Viscoelastic Inhomogeneous Media

Soczkiewicz M.

Molecular and Quantum Acoustics

2003

Vol. 24

161-168

Applying Ter Haar, Alfrey, and Gross approximations, we have calculate distributions of viscoelastic relaxation times for relaxation functions given by Schiessel et al. Fractional derivatives calculus has been applied to Maxwell model of viscoelasticity and it has been proved by means of the Gross formula that fractional derivatives brought about appearance od continous spectrum of viscoelastic relaxation frequencies. The width of this spectrum depends on the value of the fractional parameter alfa.