title: Experimental verification of nanofluid shear-wave reconversion in ultrasonic fields.
abstract: Here we present the verification of shear-mediated contributions to multiple scattering of ultrasound in suspensions. Acoustic spectroscopy was carried out with suspensions of silica of differing particle sizes and concentrations in water to find the attenuation at a broad range of frequencies. As the particle sizes approach the nanoscale, commonly used multiple scattering models fail to match experimental results. We develop a new model, taking into account shear mediated contributions, and find excellent agreement with the attenuation spectra obtained using two types of spectrometer. The results determine that shear-wave phenomena must be considered in ultrasound characterisation of nanofluids at even relatively low concentrations of scatterers that are smaller than one micrometre in diameter.
authors.affiliation: Chemical Engineering Department, Loughborough University, Loughborough, UK. d.m.forrester@lboro.ac.uk.
authors.forename: Derek Michael
authors.initials: DM
authors.lastname: Forrester
authors.affiliation: Chemical Engineering Department, Loughborough University, Loughborough, UK. d.m.forrester@lboro.ac.uk.
authors.forename: Jinrui
authors.initials: J
authors.lastname: Huang
authors.affiliation: Chemical Engineering Department, Loughborough University, Loughborough, UK. d.m.forrester@lboro.ac.uk.
authors.forename: Valerie J
authors.initials: VJ
authors.lastname: Pinfield
authors.affiliation: Laboratoire Ondes et Milieux Complexes, UMR CNRS 6294, Université du Havre, 75 rue Bellot, 76600 Le Havre, France.
authors.forename: Francine
authors.initials: F
authors.lastname: Luppé