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Separation of floating oil drops based on drop-liquid substrate interfacial tension.

08:00 EDT 18th July 2019 | BioPortfolio

Summary of "Separation of floating oil drops based on drop-liquid substrate interfacial tension."

Though various strategies exist for the transport of oil drops suspended on a liquid substrate, selective manipulation of different kind of drops based on their respective characteristics remains a challenge. In practical, it is possible to have multiple drops having different wetting states with the liquid substrate, whose separation is desired. In this work, we exploit curvature induced capillary forces for the selective manipulation (transport as well as separation) of oil droplets based on their interfacial tension (IFT) with the underlying liquid substrate. To demonstrate this, we have selected two oils having different IFT with the aqueous liquid substrate, and tuned their curvature induced capillary interaction (inward or outward from the source) by controlled addition of surfactant. We experimentally realize three droplet manipulation regimes: repulsion, attraction and separation regime. In the repulsion as well as attraction regimes, both the drops behave in the similar manner. Strikingly, in the separation regime, drops can be effectively separated based on their IFT; low IFT droplets are attracted towards the source while high IFT droplets do the reverse.

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This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
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