Ultrasonic attenuation by nanoporous particles. Part I: theory

Porous colloidal particles can dissipate ultrasonic energy at a much greater rate than solid particles of the same size and density. In this paper the mechanism for this extra dissipation is described, and a theoretical formula for the attenuation is derived for particles with interconnected pores. In Part II (William N. Rowlands, James K. Beattie, Alex M. Djerdjev, and Richard W. O'Brien, Phys. Chem. Chem. Phys., 2006, DOI: 10.1039/b605617m) this formula is compared to measurements on some porous particle systems.