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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

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Bioinspired Patterned Bubbles for Broad and Low-Frequency Acoustic Blocking.

Zhandong Huang^1,2, Shengdong Zhao, Meng Su¹

¹Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, Beijing National Laboratory for Molecular Sciences (BNLMS) , Beijing 100190 , P. R. China.

ACS Applied Materials & Interfaces

|December 11, 2019

Summary

This summary is machine-generated.

Researchers developed a new method to create stable bubble arrays in water for effective low-frequency acoustic blocking. This technique enables precise control over bubble patterns, leading to advanced acoustic wave manipulation.

Keywords:

Wenzel/Cassie state bubble acoustics metamaterials microfabrication patterned bubbles

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Area of Science:

Acoustic metamaterials
Soft matter physics
Fluid dynamics

Background:

Bubble crystals are promising for acoustic band gaps, essential for blocking sound.
Instability of bubbly liquids hinders the preparation of patterned bubble crystals.

Purpose of the Study:

To develop a simple and rapid method for preparing patterned bubble arrays in water.
To investigate the application of these bubble arrays in low-frequency acoustic blocking.

Main Methods:

Inspired by superhydrophobic biological systems, a novel approach was used to create patterned bubble arrays.
Bubble size, shape, and position were precisely controlled.
Single-layer and multilayer bubble arrays were fabricated.

Main Results:

Patterned bubble arrays with controlled size, shape, and position were successfully prepared.
Single-layer arrays demonstrated low-frequency sound blocking via local resonance.
Operating frequency was tunable from 9 to 1756 kHz by adjusting bubble size and distance.
Multilayer bubbles achieved broad, low-frequency acoustic band gaps with a generalized width (γ) of 1.26.

Conclusions:

The developed method offers a feasible strategy for controlling acoustic waves at low frequencies.
This technique has potential applications in acoustic blocking, focusing, imaging, and detection.