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Segregation in dissolving binary-component sessile droplets

Published online by Cambridge University Press:  28 December 2016

Erik Dietrich ,
Maaike Rump ,
Pengyu Lv ,
E. Stefan Kooij ,
Harold J. W. Zandvliet  and
Detlef Lohse
Erik Dietrich
Affiliation:
Physics of Fluids, MESA+ Institute for Nanotechnology and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Maaike Rump
Affiliation:
Physics of Fluids, MESA+ Institute for Nanotechnology and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Pengyu Lv
Affiliation:
Physics of Fluids, MESA+ Institute for Nanotechnology and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
E. Stefan Kooij
Affiliation:
Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Harold J. W. Zandvliet*
Affiliation:
Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Detlef Lohse*
Affiliation:
Physics of Fluids, MESA+ Institute for Nanotechnology and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands Max Planck Institute for Dynamics and Self-Organization, 37077 Goettingen, Germany
*
†Email addresses for correspondence: h.j.w.zandvliet@utwente.nl, d.lohse@utwente.nl
†Email addresses for correspondence: h.j.w.zandvliet@utwente.nl, d.lohse@utwente.nl
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Abstract

The dissolution of a single droplet, containing a mixture of oils, in water is experimentally studied. The oils in the droplet varied in terms of their solubility in water and their hydrophobicity. We demonstrate that the polarity of the droplet constituents strongly influences the dissolution dynamics. A binary-component droplet, containing two polar components (one soluble the other insoluble) exhibits a retarded dissolution as compared to a droplet containing only the soluble component. We argue that in this case the mixture in the droplet can be assumed homogeneous, leading to a smaller effective contact area of the soluble liquid in the droplet with the bulk water, and thus delayed dissolution. On the other hand, it is shown that this is not the case when a polar, soluble component is mixed with an insoluble non-polar component, in which case segregation between the different liquids inside the droplet occurs, leading to Marangoni flows and superspreading of the droplet. The segregation is confirmed by volumetric measurements and by the use of a solvatochromic dye in combination with confocal microscopy, which clearly showed that during dissolution local concentration differences inside the droplet developed.

JFM classification

Convection: Convection Drops and Bubbles: Drops and Bubbles Convection: Plumes/thermals
Type
Papers
Information
Journal of Fluid Mechanics , Volume 812 , 10 February 2017 , pp. 349 - 369
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Copyright
© 2016 Cambridge University Press 

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