Water at hydrophobic surfaces
Water at hydrophobic surfaces
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The density deficit of water adjacent to hydrophobic interfaces, frequently called the
“hydrophobic gap”, has been subject of numerous experimental and theoretical studies.
We employ high-energy x-ray reflectivity to investigate how the water depletion is affected
by the chemistry and molecular geometry of a particular hydrophobic coating.
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X-ray reflectivity from a perfluorinated SAM. From the experimental data (red symbols) a interfacial
depletion length of 1.38 Å was extracted by parameter refinement of a slab model (blue curves).
For reference, the green lines give the Fresnel reflectivity of an ideal silicon substrate.
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- M. Mezger, F. Sedlmeier, D. Horinek, H. Reichert, D. Pontoni, and H. Dosch:
On the origin of the hydrophobic water gap: An x-ray reflectivity and MD simulation study.
J. Am. Chem. Soc., 132, 6735–6741 (2010).
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Contact:
Markus Mezger
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Deutsch
