Inducing drop to bubble transformation via resonance in ultrasound

Duyang Zang (), Lin Li, Wenli Di, Zehui Zhang, Changlin Ding, Zhen Chen, Wei Shen, Bernard P. Binks and Xingguo Geng
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Duyang Zang: Northwestern Polytechnical University
Lin Li: Northwestern Polytechnical University
Wenli Di: Northwestern Polytechnical University
Zehui Zhang: Northwestern Polytechnical University
Changlin Ding: Northwestern Polytechnical University
Zhen Chen: Northwestern Polytechnical University
Wei Shen: Monash University
Bernard P. Binks: University of Hull
Xingguo Geng: Northwestern Polytechnical University

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Bubble formation plays an important role in industries concerned with mineral flotation, food, cosmetics, and materials, which requires additional energy to produce the liquid–gas interfaces. A naturally observed fact is, owing to the effect of surface tension, a bubble film tends to retract to reduce its surface area. Here we show a “reverse” phenomenon whereby a drop is transformed into a bubble using acoustic levitation via acoustic resonance. Once the volume of the cavity encapsulated by the buckled film reaches a critical value V*, resonance occurs and an abrupt inflation is triggered, leading to the formation of a closed bubble. Experiments and simulations both reveal that V* decreases with increasing acoustic frequency, which agrees well with acoustic resonance theory. The results afford enlightening insights into acoustic resonance and highlight its role in manipulating buckled fluid–fluid interfaces, providing a reference for fabricating unique core–shell-like materials.

Date: 2018
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DOI: 10.1038/s41467-018-05949-0

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