Negative/positive chemotaxis of a droplet: Dynamic response to a stimulant gas

作者：Sakuta Hiroki; Magome Nobuyuki; Mori Yoshihito; Yoshikawa Kenichi^*

来源：Applied Physics Letters, 2016, 108(20): 203703.

DOI：10.1063/1.4952396

We report here the repulsive/attractive motion of an oil droplet floating on an aqueous phase caused by the application of a stimulant gas. A cm-sized droplet of oleic acid is repelled by ammonia vapor. In contrast, a droplet of aniline on an aqueous phase moves toward hydrochloric acid as a stimulant. The mechanisms of these characteristic behaviors of oil droplets are discussed in terms of the spatial gradient of the interfacial tension caused by the stimulant gas.

• 出版日期2016-5-16