Resonant Acoustic Propagation and Negative Density in Liquid Foams

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Resonant Acoustic Propagation and Negative Density in Liquid Foams

Juliette Pierre, Benjamin Dollet, and Valentin Leroy

Phys. Rev. Lett. 112, 148307 – Published 11 April 2014

See Focus story: Stopping Sound with Foam

Abstract

We measured the dispersion relation for acoustic longitudinal waves in liquid foams, over a broad frequency range (60–600 kHz). Strong dispersion was found, with two nondispersive behaviors, separated by a negative density regime. A new model, based on the coupled displacements of films, liquid channels, and gas in the foam, rationalizes all the experimental findings.

Received 17 October 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.148307

Focus

Stopping Sound with Foam

Published 11 April 2014

Liquid foams can completely block ultrasound transmission of some frequencies, suggesting that foams are metamaterials that could be used for acoustic insulation.

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Authors & Affiliations

Juliette Pierre¹, Benjamin Dollet², and Valentin Leroy^1,*

¹Laboratoire Matière et Systèmes Complexes, Université Paris-Diderot, CNRS (UMR 7057), 75205 Paris cedex 13, France
²Institut de Physique de Rennes, Université Rennes 1, CNRS (UMR 6251), Rennes 35042, France

^*Corresponding author. valentin.leroy@univ-paris-diderot.fr

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Issue

Vol. 112, Iss. 14 — 11 April 2014

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