Dynamics of nanoscale droplets on moving surfaces

Konstantinos Ritos, Nishanth Dongari, Matthew K. Borg, Yonghao Zhang, Jason M. Reese

Research output: Contribution to journalArticle

34 Citations (Scopus)
63 Downloads (Pure)

Abstract

We use molecular dynamics (MD) simulations to investigate the dynamic wetting of nanoscale water droplets on moving surfaces. The density and hydrogen bonding profiles along the direction normal to the surface are reported, and the width of the water depletion layer is evaluated first for droplets on three different static surfaces: silicon, graphite, and a fictitious superhydrophobic surface. The advancing and receding contact angles, and contact angle hysteresis, are then measured as a function of capillary number on smooth moving silicon and graphite surfaces. Our results for the silicon surface show that molecular displacements at the contact line are influenced greatly by interactions with the solid surface and partly by viscous dissipation effects induced through the movement of the surface. For the graphite surface, however, both the advancing and receding contact angles values are close to the static contact angle value and are independent of the capillary number; i.e., viscous dissipation effects are negligible. This finding is in contrast with the wetting dynamics of macroscale water droplets, which show significant dependence on the capillary number.
Original languageEnglish
Pages (from-to)6936-6943
Number of pages8
JournalLangmuir
Volume29
Issue number23
Early online date28 May 2013
DOIs
Publication statusPublished - 11 Jun 2013

Keywords

  • nanoscale fluid dynamics
  • moving surfaces
  • droplet microfluidics
  • molecular dynamics
  • silicon surfaces

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