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Unconventional acoustic wave propagation transitions induced by resonant scatterers in the high-density limit

dc.contributor.authorBernard R. Matis
dc.contributor.authorSteven W. Liskey
dc.contributor.authorNicholas T. Gangemi
dc.contributor.authorAaron D. Edmunds
dc.contributor.authorWilliam B. Wilson
dc.contributor.authorBrian H. Houston
dc.contributor.authorJeffrey W. Baldwin
dc.contributor.authorDouglas M. Photiadis
dc.contributor.otherNaval Research Laboratory
dc.contributor.otherNaval Research Laboratory
dc.contributor.otherNaval Research Laboratory
dc.contributor.otherNaval Research Laboratory
dc.contributor.otherNaval Research Laboratory
dc.contributor.otherNaval Research Laboratory
dc.contributor.otherNaval Research Laboratory
dc.contributor.otherNaval Research Laboratory
dc.date.accessioned2024-06-30T11:17:43Z
dc.date.accessioned2025-10-08T08:38:21Z
dc.date.available2025-10-08T08:38:21Z
dc.date.issued01-06-2024
dc.identifier.urihttp://digilib.fisipol.ugm.ac.id/repo/handle/15717717/36440
dc.description.abstractAbstract Experiments on ultrasound propagation through a gel doped with resonant encapsulated microbubbles provided evidence for a discontinuous transition between wave propagation regimes at a critical excitation frequency. Such behavior is unlike that observed for soft materials doped with non-resonant air or through liquid foams, and disagrees with a simple mixture model for the effective sound speed. Here, we study the discontinuous transition by measuring the transition as a function of encapsulated microbubble volume fraction. The results show the transition always occurs in the strong-scattering limit (l/λ < 1, l and λ are the mean free path and wavelength, respectively), that at the critical frequency the effective phase velocity changes discontinuously to a constant value with increasing microbubble volume fraction, and the measured critical frequency shows a power law dependence on microbubble volume fraction. The results cannot be explained by multiple scattering theory, viscous effects, mode decoupling, or a critical density of states. It is hypothesized the transition depends upon the microbubble on-resonance effective properties, and we discuss the results within the context of percolation theory. The results shed light on the discontinuous transition’s physics, and suggest soft materials can be engineered in this manner to achieve a broad range of physical properties with potential application in ultrasonic actuators and switches.
dc.language.isoEN
dc.publisherNature Portfolio
dc.subject.lccMedicine
dc.titleUnconventional acoustic wave propagation transitions induced by resonant scatterers in the high-density limit
dc.typeArticle
dc.description.pages1-10
dc.description.doi10.1038/s41598-024-63910-2
dc.title.journalScientific Reports
dc.identifier.e-issn2045-2322
dc.identifier.oaioai:doaj.org/journal:c073e8b92d534e63a3a0a210a827fe25
dc.journal.infoVolume 14, Issue 1


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