Radio-frequency actuated polymer-based phononic meta-materials for control of ultrasonic waves

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This article describes the achievement of radio-frequency control of a n ultrasonic phononic crystal by encapsulating it in a composite of high k-10% KF-doped BaTiO₃ dielectric nanoparticles with poly(N-isopropylacrylamide) (PNIP Am)-based hydrogel.

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8 p.

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Walker, Ezekiel; Wang, Zhiming & Neogi, Arup February 24, 2017.

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This article is part of the collection entitled: UNT Scholarly Works and was provided by UNT College of Arts and Sciences to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 14 times . More information about this article can be viewed below.

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  • Walker, Ezekiel University of North Texas; Institute of Fundamental and Frontier Sciences
  • Wang, Zhiming Institute of Fundamental and Frontier Sciences
  • Neogi, Arup University of North Texas; Institute of Fundamental and Frontier Sciences

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Description

This article describes the achievement of radio-frequency control of a n ultrasonic phononic crystal by encapsulating it in a composite of high k-10% KF-doped BaTiO₃ dielectric nanoparticles with poly(N-isopropylacrylamide) (PNIP Am)-based hydrogel.

Physical Description

8 p.

Notes

Abstract: Radio-frequency (RF) control of an ultrasonic phononic crystal was achieved by encapsulating it in a composite of high k-10% KF-doped BaTiO3 dielectric nanoparticles with poly(N-isopropylacrylamide) (PNIPAm)-based hydrogel. The combination of the nanoparticles and hydrogel produced a composite with elastic properties susceptible to RF actuation. The novel acoustic meta-material enables the regulation of sound waves by electromagnetic waves, which is not possible in a conventional medium as elasto-mechanical waves, and electromagnetic waves do not directly couple. Compared with light waves, radio waves can penetrate deeper into bulk structures and enable the control of propagation of ultrasonic waves through a macroscale phononic crystal. An RF antenna emitting at 318.6 and 422.5 kHz was used to modulate the device in water and ambient air, respectively. An increased transparency of the ultrasonic wave in the material was observed due to an increase in the bandwidth of the modulated device exceeding 8 kHz with a 30-fold increase in the signal modulation at select frequencies. The radio waves induced changes in the transmission and demonstrated the control of ultrasound with applied RF. The synthetic acoustic properties in the resultant meta-material device were actively manipulated through the interaction of electromagnetic waves with the material.

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  • NPG Asia Materials, 2017. London, UK: Nature Publishing Group

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Publication Information

  • Publication Title: NPG Asia Materials
  • Volume: 9
  • Pages: 1-8
  • Peer Reviewed: Yes

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Submitted Date

  • July 14, 2016

Accepted Date

  • November 21, 2016

Creation Date

  • February 24, 2017

Added to The UNT Digital Library

  • Aug. 29, 2017, 9:38 a.m.

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Walker, Ezekiel; Wang, Zhiming & Neogi, Arup. Radio-frequency actuated polymer-based phononic meta-materials for control of ultrasonic waves, article, February 24, 2017; London, United Kingdom. (digital.library.unt.edu/ark:/67531/metadc991042/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.