ESEM imaging of condensation on a nanostructured superhydrophobic surface

C. Dietz, Konrad Rykaczewski, A. Fedorov, Y. Joshi

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Environmental SEM images of water vapor at 5 Torr condensing on a CuO superhydrophobic surface held at 0°C. The drop growth, pinning on the surface, and coalescence is depicted in this series of images. The flower-like, CuO nanostructures, consisting of a ~3 μm diameter bud and ~200 nm thick petals, are formed by immersing copper into a solution of 2.5 M NaOH and 0.1 M (NH4)2S2O8. The self assembled nanostructures are then functionalized with a fluorinated polymer. The result is a superhydrophobic surface (a surface in which the contact angle is greater than 150o). Condensation on a superhydrophobic surface may lead to a permanent increase in the heat transfer coefficient. By using an environmental SEM and a Peltier stage, high resolution images of water vapor condensing on these surfaces is visualized. Due to drop pinning on the structures, the drops are not spherical after coalescence. As a result, the surface tends to be wetted by the condensate, bringing in to question whether superhydrophobic surfaces are still superhydrophobic under ESEM operating conditions.

Original languageEnglish (US)
Pages (from-to)1
Number of pages1
JournalJournal of Heat Transfer
Volume132
Issue number8
StatePublished - Aug 2010
Externally publishedYes

Fingerprint

Condensation
condensation
Imaging techniques
condensing
Steam
Coalescence
Water vapor
coalescing
Fluorocarbon Polymers
water vapor
Nanostructures
petals
Scanning electron microscopy
scanning electron microscopy
Image resolution
heat transfer coefficients
Heat transfer coefficients
Contact angle
condensates
Copper

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

ESEM imaging of condensation on a nanostructured superhydrophobic surface. / Dietz, C.; Rykaczewski, Konrad; Fedorov, A.; Joshi, Y.

In: Journal of Heat Transfer, Vol. 132, No. 8, 08.2010, p. 1.

Research output: Contribution to journalArticle

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