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Issue 7, 2011
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Dynamical blebbing at a droplet interface driven by instability in elastic stress: a novel self-motile system

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Abstract

Dynamical blebbing in an oil–water system is reported together with a quantitative analysis of interfacial deformation. An oil droplet containing a fatty acid that floats on an aqueous phase containing a cationic surfactant shows blebbing-type deformation at the oil–water interface. Such deformation is caused by an out-of-equilibrium concentration distribution across the interface. The generation and breakage of aggregates at the interface is associated with the time-dependent instability of the interface that accompanies the blebbing. In a quantitative analysis, the size of the bleb depended on the size of the oil droplet: the size of the bleb was inversely proportional to the square root of the radius of the oil droplet approximately. Furthermore, the experimental results showed that an oil droplet undergoes translational motion, i.e., active Brownian motion, under a suitable size of the oil droplet. A simple mathematical model based on the elasticity of the aggregates is proposed, and this agrees well with the experimental results.

Graphical abstract: Dynamical blebbing at a droplet interface driven by instability in elastic stress: a novel self-motile system

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Publication details

The article was received on 01 Sep 2010, accepted on 09 Feb 2011 and first published on 03 Mar 2011


Article type: Paper
DOI: 10.1039/C0SM00906G
Citation: Soft Matter, 2011,7, 3204-3212
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    Dynamical blebbing at a droplet interface driven by instability in elastic stress: a novel self-motile system

    Y. Sumino, H. Kitahata, H. Seto and K. Yoshikawa, Soft Matter, 2011, 7, 3204
    DOI: 10.1039/C0SM00906G

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