IJCsatellite IJCsatellite/nlin

Paper: nlin.AO/0505006
Date: Mon, 2 May 2005 09:53:55 GMT   (661kb)

Chemo-Sensitive Running Droplet

Yutaka Sumino, Masaharu Nagayama, Hiroyuki Kitahata, Shin-ichiro M. Nomura, Nobuyuki Magome, Yoshihito Mori and Kenichi Yoshikawa

Comments: 8 pages, 10 figures
Subj-class: Adaptation and Self-Organizing Systems; Pattern Formation and Solitons

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 within a certain chemical territory of oil-droplet motion, and also its transient behavior. Our results may shed light on physical aspects of reactive spreading and a chemotaxis in living things.

( http://arXiv.org/abs/nlin/0505006 , 661kb)

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