69th Annual Meeting of the APS Division of Fluid Dynamics (November 20, 2016 — November 22, 2016)

V0103: Evaporative crystallization on nano-textured surfaces

  • Samantha McBride, Massachusetts Institute of Technology
  • Susmita Dash, Massachusetts Institute of Technology
  • Kripa Varanasi, Massachusetts Institute of Technology
DOI: https://doi.org/10.1103/APS.DFD.2016.GFM.V0103

Controlling evaporative crystal deposits is important for a variety of applications, including printing, corrosion control, and study of crystal polymorphs. In this video we demonstrate evaporative crystallization of calcium sulfate salt from a small drop of water on different surfaces. Evaporation on a regular hydrophilic surface is contrasted to specialty superhydrophobic surfaces. We use a variety of superhydrophobic surfaces with different nano- and micro-textures to demonstrate how surface texture can be used to control contact angle, which controls evaporative flow, which then ultimately controls the form of the crystal deposit. 

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