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Issue 15, 2014
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Breathing, crawling, budding, and splitting of a liquid droplet under laser heating

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Abstract

The manipulation of droplets with sizes on the millimetre scale and below has attracted considerable attention over the past few decades for applications in microfluidics, biology, and chemistry. In this paper, we report the response of an oil droplet floating in an aqueous solution to local laser heating. Depending on the laser power, distinct dynamic transitions of the shape and motion of the droplet are observed, namely, breathing, crawling, budding, and splitting. We found that the selection of the dynamic modes is determined by dynamic instabilities due to the interplay between the convection flows and capillary effects. Our findings can be useful for constructing microfluidic devices to control the motion and shape of a small droplet by simply altering the laser power, and for understanding thermal convective systems with fully soft boundaries.

Graphical abstract: Breathing, crawling, budding, and splitting of a liquid droplet under laser heating

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Publication details

The article was received on 25 Sep 2012, accepted on 13 Jan 2014 and first published on 14 Jan 2014


Article type: Paper
DOI: 10.1039/C2SM27207E
Citation: Soft Matter, 2014,10, 2679-2684

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    Breathing, crawling, budding, and splitting of a liquid droplet under laser heating

    C. Song, J. K. Moon, K. Lee, K. Kim and H. K. Pak, Soft Matter, 2014, 10, 2679
    DOI: 10.1039/C2SM27207E

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