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Condensation on Superhydrophobic Copper Oxide Nanostructures

[+] Author Affiliations
Ryan Enright

Massachusetts Institute of Technology, Cambridge, MAUniversity of Limerick, Limerick, Ireland

Nicholas Dou, Nenad Miljkovic, Youngsuk Nam, Evelyn N. Wang

Massachusetts Institute of Technology, Cambridge, MA

Paper No. MNHMT2012-75277, pp. 419-425; 7 pages
doi:10.1115/MNHMT2012-75277
From:
  • ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer
  • ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer
  • Atlanta, Georgia, USA, March 3–6, 2012
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 978-0-7918-5477-8
  • Copyright © 2012 by ASME

abstract

Condensation is an important process in both emerging and traditional power generation and water desalination technologies. Superhydrophobic nanostructures promise enhanced condensation heat transfer by reducing the characteristic size of departing droplets via a surface-tension-driven mechanism [1]. In this work, we investigated a scalable synthesis technique to produce oxide nanostructures on copper surfaces capable of sustaining superhydrophobic condensation and characterized the growth and departure behavior of condensed droplets. Nanostructured copper oxide (CuO) films were formed via chemical oxidation in an alkaline solution. A dense array of sharp CuO nanostructures with characteristic heights and widths of ∼1 μm and ∼300 nm, respectively, were formed. A gold film was deposited on the surface and functionalized with a self-assembled monolayer to make the surfaces hydrophobic. Condensation on these surfaces was then characterized using optical microscopy (OM) and environmental scanning electron microscopy (ESEM) to quantify the distribution of nucleation sites and elucidate the growth behavior of individual droplets with a characteristic size of ∼1 to 10 μm at low supersaturations. Comparison of the observed behavior to a recently developed model for condensation on superhydrophobic surfaces [2, 3] suggests a restricted regime of heat transfer enhancement compared to a corresponding smooth hydrophobic surface due to the large apparent contact angles demonstrated by the CuO surface.

Copyright © 2012 by ASME

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