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Thermocapillary motion on lubricant-impregnated surfaces

Nada Bjelobrk1, Henri-Louis Girard1, Srinivas Bengaluru Subramanyam2, Hyuk-Min Kwon1, David Quéré3,*, and Kripa K. Varanasi1,*

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA
  • 2Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA
  • 3Laboratoire de Physique et Mécanique des Milieux Hétérogènes, UMR No. 7636 du CNRS, ESPCI, 75005 Paris, France

  • *Corresponding authors: david.quere@espci.fr; varanasi@mit.edu
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Phys. Rev. Fluids 1, 063902 – Published 14 October, 2016

DOI: https://doi.org/10.1103/PhysRevFluids.1.063902

Abstract

We show that thermocapillary-induced droplet motion is markedly enhanced when using lubricant-impregnated surfaces as compared to solid substrates. These surfaces provide weak pinning, which makes them ideal for droplet transportation and specifically for water transportation. Using a lubricant with viscosity comparable to that of water and temperature gradients as low as 2 K/mm, we observe that drops can propel at 6.5 mm/s, that is, at least 5 times quicker than reported on conventional substrates. Also in contrast with solids, the liquid nature of the different interfaces makes it possible to predict quantitatively the thermocapillary Marangoni force (and velocity) responsible for the propulsion.

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Phys. Rev. Fluids 1, 063902– Published 14 October, 2016
  • Received 28 March 2016

©2016 American Physical Society

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