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

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

Langmuir : the ACS journal of surfaces and colloids (2017-05-16)
Naoko Ueno, Taisuke Banno, Arisa Asami, Yuki Kazayama, Yuya Morimoto, Toshihisa Osaki, Shoji Takeuchi, Hiroyuki Kitahata, Taro Toyota
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Poly(dimethylsiloxane), viscosity 1.0 cSt (25 °C)
Sigma-Aldrich
4-Butoxybenzaldehyde, 98%
Sigma-Aldrich
Trimethyloctylammonium bromide, ≥98.0% (AT)