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

Hiroki Sakuta | Zendy; Nobuyuki Magome | Zendy; Yoshihito Mori | Zendy; Kenichi Yoshikawa | Zendy

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

Author(s) -

Hiroki Sakuta,

Nobuyuki Magome,

Yoshihito Mori,

Kenichi Yoshikawa

Publication year - 2016

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4952396

Subject(s) - stimulant , surface tension , chemistry , aqueous solution , hydrochloric acid , aniline , chemical physics , inorganic chemistry , thermodynamics , organic chemistry , physics , pharmacology , medicine

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.

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