Abstract
In this paper, we demonstrate our recent attempt to construct a chemical model system of amoeboid motion. The system is intended to mimic biological motility based on the generation and collapse of an elastic aggregate; it is composed of oil, water, and surfactants. In this chemical system, the oil–water interface shows extension and retreat of spherical extrusions accompanied by the generation of aggregate on the interface. This instability of the oil–water interface can cause autonomous splitting and motion of a floating oil droplet. The current mathematical model based on the generation of a passive elastic gel is explained, as well as the discrepancy between the model and the experiments. We further describe recently observed microscopic characteristics of the aggregate formation process that might cause the interfacial instability. Finally, we discuss the disadvantage of a chemical model system compared with active colloid and in vitro biological systems, and also mention its potential advantages.
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Sumino, Y., Yoshikawa, K. Amoeba-like motion of an oil droplet. Eur. Phys. J. Spec. Top. 223, 1345–1352 (2014). https://doi.org/10.1140/epjst/e2014-02194-x
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DOI: https://doi.org/10.1140/epjst/e2014-02194-x