Chemosensitive running droplet.
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.
Sumino
Yutaka
Y
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
Kitahata
Hiroyuki
H
Yoshikawa
Kenichi
K
Nagayama
Masaharu
M
Nomura
Shin-ichiro M
SM
Magome
Nobuyuki
N
Mori
Yoshihito
Y