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Double-negative acoustic metamaterial with enhanced dipole resonance and application thereof

An acoustic metamaterial and double-negative technology, applied in the field of acoustic metamaterials, can solve problems such as weak dipole resonance and difficulty in obtaining double-negative acoustic parameters, and achieve the effect of broad application prospects

Active Publication Date: 2021-10-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current dipole resonances of acoustic metamaterials based on porous silica microspheres or porous hydrogel microspheres are generally weak, and it is difficult to simultaneously obtain double negative acoustic parameters over a wide frequency range.

Method used

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  • Double-negative acoustic metamaterial with enhanced dipole resonance and application thereof
  • Double-negative acoustic metamaterial with enhanced dipole resonance and application thereof
  • Double-negative acoustic metamaterial with enhanced dipole resonance and application thereof

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Embodiment

[0032] Add BATIO 3Porous polyethylene glycol double acrylate hydrogel microspheres of nanoparticles as ultrafondens, scattered body density is 800 kg / m 3 The sound speed is 100m / s, the radius is 40 μm; the density of the ultrasonic coupling agent is 1000kg / m. 3 The sound speed is 1500 m / s; uniformly disperse the scatterer microspheres in the ultrasonic coupling agent matrix, and the required double-negative acoustic super material is obtained, wherein the volume fraction of the measuring sphere is 20%. Equivalent mass density and equivalent modulus of multi-scattering model calculated with frequency change curves figure 2 As shown, the acoustic super material can achieve strong single-pole resonance and dipole resonance at a wide frequency range of 1.08 to 1.32 MHz, thereby obtaining negative equivalent mass density and negative elastic modulus.

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Abstract

The invention discloses a double-negative acoustic metamaterial with enhanced dipole resonance. The double-negative acoustic metamaterial with enhanced dipole resonance comprises an ultrasonic coupling agent serving as a base body and a scatterer dispersed in the base body and used for generating Mie resonance; the scatterer is a porous polyethylene glycol diacrylate hydrogel microsphere PEGDA added with high-density nanoparticles. The invention also discloses an application of the double-negative acoustic metamaterial in craniocerebral ultrasonic imaging and high-intensity focused ultrasound therapy. The double-negative acoustic metamaterial provided by the invention can realize strong monopole resonance and dipole resonance in a relatively wide frequency range of 1.08-1.32 MHz, so that the negative equivalent mass density and the negative equivalent elastic modulus are obtained at the same time, and the double-negative acoustic metamaterial has a wide application prospect in the medical fields of craniocerebral ultrasonic imaging, high-intensity focused ultrasound therapy and the like.

Description

Technical field [0001] The present invention belongs to the field of acoustic super material, and in particular, the present invention relates to a dual-negative acoustic ultra-material and its application thereof. Background technique [0002] Super material is an artificial periodic material having an exceptional physical property consisting of sub-wavelength structural units. Since its structural scale is much smaller than the working wavelength, it cannot be distinguished by the sound wave, and therefore it can be described as a homogeneous material and is described in equivalent parameters. By cleverly designing the structural unit of the super material, the transmission direction of the acoustic wave can be accurately manipulated, thereby achieving unique functions of conventional materials, such as negative reflection, negative reflection, sound invisible, etc., in military invisible, damping and noise reduction, medical imaging The field has a broad application prospect. ...

Claims

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Application Information

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IPC IPC(8): A61K49/22A61B8/00A61N7/00
CPCA61K49/22A61B8/4281A61N7/00
Inventor 黄玉辉陈洁吴勇军金一铭洪子健
Owner ZHEJIANG UNIV
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