Spontaneous Mode Selection of Self-Motile Object under Chemical Noneqilibricity

It is known that chemical nonequilibricity causes spontaneous agitation on the interface under isothermal condition, i.e., Chemical Marangoni effect. In the present paper, we show that random chaotic fluctuation of the interface is transformed into several specific motions under suitable boundary conditions by adapting oil/water two-phase system. The emergence of regular motion on such oil/water system is discussed in relation to the intrinsic mechanism of the transduction from chemical into mechanical energy in living organisms.