Abstract
Ultrasound attenuation spectroscopy provides a unique means for studying various properties of complex fluids such as aggregative stability, particle size, longitudinal rheology, zeta potential, etc. Additionally, ultrasound emerges as an important tool for microfluidics. These features of ultrasound attenuation spectroscopy are dependent upon a theory that describes colloidal particle motion in an ultrasound field. Here we verify experimentally the validity of this well-known theory at elevated temperatures. We measured the attenuation frequency spectra for a stable dispersion of alumina particles (300nm) at different temperatures from 25°C to 50°C. Temperature variation affects water viscosity, which is a key parameter in said theory. We have demonstrated that the theory accounts for such dependence accurately, because critical hydrodynamic relaxation frequency shifts as the theory predicts, and particle size calculated from the measured attenuation spectra remains constant over the complete temperature range.
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