Ultrasound attenuation and phase velocity of moderately concentrated silica suspensions

Hayato Mori; Tomohisa Norisuye; Hideyuki Nakanishi; Qui Tran-Cong-Miyata

doi:10.1016/j.ultras.2018.10.010

Ultrasound attenuation and phase velocity of moderately concentrated silica suspensions

Ultrasonics. 2019 Mar:93:63-70. doi: 10.1016/j.ultras.2018.10.010. Epub 2018 Oct 31.

Authors

Hayato Mori¹, Tomohisa Norisuye², Hideyuki Nakanishi¹, Qui Tran-Cong-Miyata¹

Affiliations

¹ Department of Macromolecular Science and Engineering, Graduate School of Science & Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
² Department of Macromolecular Science and Engineering, Graduate School of Science & Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan. Electronic address: nori@kit.jp.

PMID: 30408681
DOI: 10.1016/j.ultras.2018.10.010

Abstract

Ultrasound attenuation coefficient and phase velocity of moderately concentrated suspensions of charged silica particles were measured as a function of frequency. The attenuation coefficients were found to be significantly smaller than the theoretical prediction, and such a difference did not appear in the neutral particle suspensions under the corresponding concentrations. In this study, we have investigated the acoustic spectra of silica particles with different particle sizes, concentrations as well as salt concentrations. It was revealed that the noticeable deviation from the theoretical estimation only appeared in the case of large particle sizes close to the wavelength of ultrasound, and could be circumvented by addition of small amount of salt to suppress the electrostatic interactions of the charged silica particles.

Keywords: Attenuation; Microparticle; Scattering; Sound velocity.