Thermoacoustic sound projector: Exceeding the fundamental efficiency of carbon nanotubes

Research output: Contribution to journalArticleScientificpeer-review

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Thermoacoustic sound projector : Exceeding the fundamental efficiency of carbon nanotubes. / Aliev, Ali E.; Codoluto, Daniel; Baughman, Ray H.; Ovalle-Robles, Raquel; Inoue, Kanzan; Romanov, Stepan A.; Nasibulin, Albert G.; Kumar, Prashant; Priya, Shashank; Mayo, Nathanael K.; Blottman, John B.

In: Nanotechnology, Vol. 29, No. 32, 325704, 05.06.2018, p. 1-17.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Aliev, AE, Codoluto, D, Baughman, RH, Ovalle-Robles, R, Inoue, K, Romanov, SA, Nasibulin, AG, Kumar, P, Priya, S, Mayo, NK & Blottman, JB 2018, 'Thermoacoustic sound projector: Exceeding the fundamental efficiency of carbon nanotubes' Nanotechnology, vol. 29, no. 32, 325704, pp. 1-17. https://doi.org/10.1088/1361-6528/aac509

APA

Aliev, A. E., Codoluto, D., Baughman, R. H., Ovalle-Robles, R., Inoue, K., Romanov, S. A., ... Blottman, J. B. (2018). Thermoacoustic sound projector: Exceeding the fundamental efficiency of carbon nanotubes. Nanotechnology, 29(32), 1-17. [325704]. https://doi.org/10.1088/1361-6528/aac509

Vancouver

Aliev AE, Codoluto D, Baughman RH, Ovalle-Robles R, Inoue K, Romanov SA et al. Thermoacoustic sound projector: Exceeding the fundamental efficiency of carbon nanotubes. Nanotechnology. 2018 Jun 5;29(32):1-17. 325704. https://doi.org/10.1088/1361-6528/aac509

Author

Aliev, Ali E. ; Codoluto, Daniel ; Baughman, Ray H. ; Ovalle-Robles, Raquel ; Inoue, Kanzan ; Romanov, Stepan A. ; Nasibulin, Albert G. ; Kumar, Prashant ; Priya, Shashank ; Mayo, Nathanael K. ; Blottman, John B. / Thermoacoustic sound projector : Exceeding the fundamental efficiency of carbon nanotubes. In: Nanotechnology. 2018 ; Vol. 29, No. 32. pp. 1-17.

Bibtex - Download

@article{70bc7733439d4ce0b137f05fe751a8c7,
title = "Thermoacoustic sound projector: Exceeding the fundamental efficiency of carbon nanotubes",
abstract = "The combination of smooth, continuous sound spectra produced by a sound source having no vibrating parts, a nanoscale thickness of a flexible active layer and the feasibility of creating large, conformal projectors provoke interest in thermoacoustic phenomena. However, at low frequencies, the sound pressure level (SPL) and the sound generation efficiency of an open carbon nanotube sheet (CNTS) is low. In addition, the nanoscale thickness of fragile heating elements, their high sensitivity to the environment and the high surface temperatures practical for thermoacoustic sound generation necessitate protective encapsulation of a freestanding CNTS in inert gases. Encapsulation provides the desired increase of sound pressure towards low frequencies. However, the protective enclosure restricts heat dissipation from the resistively heated CNTS and the interior of the encapsulated device. Here, the heat dissipation issue is addressed by short pulse excitations of the CNTS. An overall increase of energy conversion efficiency by more than four orders (from 10-5 to 0.1) and the SPL of 120 dB re 20 μPa @ 1 m in air and 170 dB re 1 μPa @ 1 m in water were demonstrated. The short pulse excitation provides a stable linear increase of output sound pressure with substantially increased input power density (>2.5 W cm-2). We provide an extensive experimental study of pulse excitations in different thermodynamic regimes for freestanding CNTSs with varying thermal inertias (single-walled and multiwalled with varying diameters and numbers of superimposed sheet layers) in vacuum and in air. The acoustical and geometrical parameters providing further enhancement of energy conversion efficiency are discussed.",
keywords = "carbon nanotubes, heat transfer, pulse excitation, sonar projectors, sound, thermoacoustics",
author = "Aliev, {Ali E.} and Daniel Codoluto and Baughman, {Ray H.} and Raquel Ovalle-Robles and Kanzan Inoue and Romanov, {Stepan A.} and Nasibulin, {Albert G.} and Prashant Kumar and Shashank Priya and Mayo, {Nathanael K.} and Blottman, {John B.}",
year = "2018",
month = "6",
day = "5",
doi = "10.1088/1361-6528/aac509",
language = "English",
volume = "29",
pages = "1--17",
journal = "Nanotechnology",
issn = "0957-4484",
number = "32",

}

RIS - Download

TY - JOUR

T1 - Thermoacoustic sound projector

T2 - Exceeding the fundamental efficiency of carbon nanotubes

AU - Aliev, Ali E.

AU - Codoluto, Daniel

AU - Baughman, Ray H.

AU - Ovalle-Robles, Raquel

AU - Inoue, Kanzan

AU - Romanov, Stepan A.

AU - Nasibulin, Albert G.

AU - Kumar, Prashant

AU - Priya, Shashank

AU - Mayo, Nathanael K.

AU - Blottman, John B.

PY - 2018/6/5

Y1 - 2018/6/5

N2 - The combination of smooth, continuous sound spectra produced by a sound source having no vibrating parts, a nanoscale thickness of a flexible active layer and the feasibility of creating large, conformal projectors provoke interest in thermoacoustic phenomena. However, at low frequencies, the sound pressure level (SPL) and the sound generation efficiency of an open carbon nanotube sheet (CNTS) is low. In addition, the nanoscale thickness of fragile heating elements, their high sensitivity to the environment and the high surface temperatures practical for thermoacoustic sound generation necessitate protective encapsulation of a freestanding CNTS in inert gases. Encapsulation provides the desired increase of sound pressure towards low frequencies. However, the protective enclosure restricts heat dissipation from the resistively heated CNTS and the interior of the encapsulated device. Here, the heat dissipation issue is addressed by short pulse excitations of the CNTS. An overall increase of energy conversion efficiency by more than four orders (from 10-5 to 0.1) and the SPL of 120 dB re 20 μPa @ 1 m in air and 170 dB re 1 μPa @ 1 m in water were demonstrated. The short pulse excitation provides a stable linear increase of output sound pressure with substantially increased input power density (>2.5 W cm-2). We provide an extensive experimental study of pulse excitations in different thermodynamic regimes for freestanding CNTSs with varying thermal inertias (single-walled and multiwalled with varying diameters and numbers of superimposed sheet layers) in vacuum and in air. The acoustical and geometrical parameters providing further enhancement of energy conversion efficiency are discussed.

AB - The combination of smooth, continuous sound spectra produced by a sound source having no vibrating parts, a nanoscale thickness of a flexible active layer and the feasibility of creating large, conformal projectors provoke interest in thermoacoustic phenomena. However, at low frequencies, the sound pressure level (SPL) and the sound generation efficiency of an open carbon nanotube sheet (CNTS) is low. In addition, the nanoscale thickness of fragile heating elements, their high sensitivity to the environment and the high surface temperatures practical for thermoacoustic sound generation necessitate protective encapsulation of a freestanding CNTS in inert gases. Encapsulation provides the desired increase of sound pressure towards low frequencies. However, the protective enclosure restricts heat dissipation from the resistively heated CNTS and the interior of the encapsulated device. Here, the heat dissipation issue is addressed by short pulse excitations of the CNTS. An overall increase of energy conversion efficiency by more than four orders (from 10-5 to 0.1) and the SPL of 120 dB re 20 μPa @ 1 m in air and 170 dB re 1 μPa @ 1 m in water were demonstrated. The short pulse excitation provides a stable linear increase of output sound pressure with substantially increased input power density (>2.5 W cm-2). We provide an extensive experimental study of pulse excitations in different thermodynamic regimes for freestanding CNTSs with varying thermal inertias (single-walled and multiwalled with varying diameters and numbers of superimposed sheet layers) in vacuum and in air. The acoustical and geometrical parameters providing further enhancement of energy conversion efficiency are discussed.

KW - carbon nanotubes

KW - heat transfer

KW - pulse excitation

KW - sonar projectors

KW - sound

KW - thermoacoustics

UR - http://www.scopus.com/inward/record.url?scp=85048345530&partnerID=8YFLogxK

U2 - 10.1088/1361-6528/aac509

DO - 10.1088/1361-6528/aac509

M3 - Article

VL - 29

SP - 1

EP - 17

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 32

M1 - 325704

ER -

ID: 26482299