How water meets a very hydrophobic surface

Details How water meets a very hydrophobic surface How water meets a very hydrophobic surface

2010-06-23

arxiv.org/abs/1006.4620v1

Phys. Rev. Lett., 105, 37803 (2010)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 3 figures; Phys. Rev. Lett., to be published

Scientific paper

10.1103/PhysRevLett.105.037803

Is there a low-density region ('gap') between water and a hydrophobic surface? Previous X-ray/neutron reflectivity results have been inconsistent because the effect (if any) is sub-resolution for the surfaces studied. We have used X-ray reflectivity to probe the interface between water and more hydrophobic smooth surfaces. The depleted region width increases with contact angle and becomes larger than the resolution, allowing definitive measurements. Large fluctuations are predicted at this interface; however, we find that their contribution to the interface roughness is too small to measure.

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