Journal
LANGMUIR
Volume 33, Issue 46, Pages 13234-13241Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.7b03356
Keywords
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Funding
- Israel Ministry of Absorption
- Ministry of Education and Science of the Russian Federation [14.607.21.0160, RFMEFI60716X0160]
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Self-locomotion of liquid marbles, coated with lycopodium or fumed fluorosilica powder, filled with a saturated aqueous solution of camphor and placed on a water/vapor interface is reported. Self-propelled marbles demonstrated a complicated motion, representing a superposition of translational and rotational motions. Oscillations of the velocity of the center of mass and the angular velocity of marbles, occurring in the antiphase, were registered and explained qualitatively. Self-propulsion occurs because of the Marangoni solutocapillary flow inspired by the adsorption of camphor (evaporated from the liquid marble) by the water surface. Scaling laws describing translational and rotational motions are proposed and checked. The rotational motion of marbles arises from the asymmetry of the field of the Marangoni stresses because of the adsorption of camphor evaporated from marbles.
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