Development of dynamic ultrasound scattering method and acoustic radiation field analysis of submicron suspended particles.

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Radiation scattering techniques such as light scattering and small-angle X-ray scattering have been utilized to quantitatively characterize the microstructure of polymeric materials. An ultrasound method called Dynamic ultraSound Scattering(DSS) enables us to analyze optically turbid solutions, e. g., a suspension of carbon nanotubes, which is hardly detectable by optical techniques. However, the applicability of the ultrasound technique has been limited to the particle size above several micrometers because of the spatial resolution determined by the wavelength of Megahertz ultrasound, which is typically several tens of micrometers. In order to develop this technique applicable to sub-micron particles, we have studied a novel DSS system equipped with polymer or polymer/ceramics composite transducer to achieve the better spatial resolution with the higher frequency sound emission.