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Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Oct;72(4 Pt 1):041603. Epub 2005 Oct 10.

Chemosensitive running droplet.

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  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.

Abstract

Chemical control of the spontaneous motion of a reactive oil droplet moving on a glass substrate under an aqueous phase is reported. Experimental results show that the self-motion of an oil droplet is confined on an acid-treated glass surface. The transient behavior of oil-droplet motion is also observed with a high-speed video camera. A mathematical model that incorporates the effect of the glass surface charge is built based on the experimental observation of oil-droplet motion. A numerical simulation of this mathematical model reproduced the essential features concerning confinement of oil droplet motion within a certain chemical territory and also its transient behavior. Our results may shed light on physical aspects of reactive spreading and a chemotaxis in living things.

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