What is it about?
Antibubble is an opposite to the common soap bubble which is an air film separating the inner and outer liquid phases. The fragile air film is usually stabilized by surfactant molecules. We generated surfactant-free antibubbles with air films stabilized by air drainage due to the evaporation of the inner droplet. Moreover, the ejection of the inner droplet is realized, which is almost impossible for the common antibubbles.
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Why is it important?
The surfactant-free antibubbles can promote the practical applications in various liquids, avoiding the influence of surfactant molecules on the liquid properties. The release of the inner droplet implies the possibility to manipulate droplet accross the air-liquid interface.
Perspectives
We hope this article can stimulate the investigation on the droplet manipulation accross the air-liquid interface. This can connect the common closed microfluidics in channels and open microfluids in air: the droplet moves in air can be transported in liquid as an antibubble while released into air again for the convenience of manipulations.
Wei WANG
Hangzhou City University
Read the Original
This page is a summary of: Drop impact on a heated liquid bath: Formation of antibubbles, Physics of Fluids, February 2024, American Institute of Physics,
DOI: 10.1063/5.0187791.
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