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How water meets a hydrophobic surface.

Adelé Poynor1, Liang Hong, Ian K Robinson

  • 1Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA.

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|February 7, 2007
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X-ray reflectivity reveals a water depletion layer at hydrophobic surfaces with high contact angles. This finding, observed with methyl-terminated octadecylsilane monolayers, challenges nanobubble explanations.

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Area of Science:

  • Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Hydrophobic surfaces are crucial in various applications, but their interfacial water structure remains debated.
  • Previous studies suggested the presence of 'nanobubbles' at such interfaces.

Purpose of the Study:

  • To investigate the interfacial structure of water on highly hydrophobic surfaces using synchrotron X-ray reflectivity.
  • To determine if 'nanobubbles' can explain observed phenomena at the water-hydrocarbon interface.

Main Methods:

  • Synchrotron X-ray reflectivity measurements were performed on methyl-terminated octadecylsilane (octadecylsilane) monolayers.
  • Contact angle measurements were used to characterize surface hydrophobicity.
  • Analysis considered coherent and incoherent averaging of lateral inhomogeneities.

Main Results:

  • A distinct water depletion layer, 2-4 Angstrom thick, was observed at the interface with stable contact angles >100 degrees.
  • The electron density of this layer was less than 40% of bulk water.
  • The observed depletion layer could not be explained by 'nanobubbles' when considering lateral inhomogeneities.

Conclusions:

  • The study provides conclusive evidence for a water depletion layer at highly hydrophobic interfaces.
  • The findings refute 'nanobubble' models for explaining interfacial water structure under these conditions.
  • Surface smoothness and contact angle stability are critical for observing this interfacial phenomenon.