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Nanomaterials 2018, 8(10), 833; https://doi.org/10.3390/nano8100833

On the Frequency Response of Nanostructured Thermoacoustic Loudspeakers

1
Department of Engineering "Enzo Ferrari", University of Modena and Reggio Emilia, 41125 Modena, Italy
2
Chair of Nanoelectrics, Technical University of Munich, 80333 Munich, Germany
3
ASK Industries S.p.A., 60037 Monte San Vito (AN), Italy
4
Faculty of Science and Technology, Free University of Bozen-Bolzano, 39100 Bolzano, Italy
5
Department of Science and Methods for Engineering, University of Modena and Reggio Emilia, 42122 Reggio Emilia, Italy
*
Authors to whom correspondence should be addressed.
Received: 17 September 2018 / Revised: 12 October 2018 / Accepted: 12 October 2018 / Published: 14 October 2018
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Abstract

In this work, we investigate the thermal and acoustic frequency responses of nanostructured thermoacoustic loudspeakers. An opposite frequency dependence of thermal and acoustic responses was found independently of the device substrate (Kapton and glass) and the nanometric active film (silver nanowires and nm-thick metal films). The experimental results are interpreted with the support of a comprehensive electro-thermo-acoustic model, allowing for the separation of the purely thermal effects from the proper thermoacoustic (TA) transduction. The thermal interactions causing the reported opposite trends are understood, providing useful insights for the further development of the TA loudspeaker technology. View Full-Text
Keywords: thermoacoustic; loudspeaker; silver nanowire; nanometric gold film; thermal response; acoustic response; heat distribution; thermal effusivity thermoacoustic; loudspeaker; silver nanowire; nanometric gold film; thermal response; acoustic response; heat distribution; thermal effusivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Torraca, P.L.; Bobinger, M.; Servadio, M.; Pavan, P.; Becherer, M.; Lugli, P.; Larcher, L. On the Frequency Response of Nanostructured Thermoacoustic Loudspeakers. Nanomaterials 2018, 8, 833.

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