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Langmuir : the ACS journal of surfaces and colloids

Self-Propelled Motion of Monodisperse Underwater Oil Droplets Formed by a Microfluidic Device.


PMID 28502179

Abstract

We evaluated the speed profile of self-propelled underwater oil droplets comprising a hydrophobic aldehyde derivative in terms of their diameter and the surrounding surfactant concentration using a microfluidic device. We found that the speed of the oil droplets is dependent on not only the surfactant concentration but also the droplet size in a certain range of the surfactant concentration. This tendency is interpreted in terms of combination of the oil and surfactant affording spontaneous emulsification in addition to the Marangoni effect.