How water meets a very hydrophobic surface

Sudeshna Chattopadhyay*, Ahmet Uysal, Benjamin Stripe, Young Geun Ha, Tobin J. Marks, Evguenia A. Karapetrova, Pulak Dutta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


Is there a low-density region ("gap") between water and a hydrophobic surface? Previous x-ray and neutron reflectivity results have been inconsistent because the effect (if any) is subresolution 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.

Original languageEnglish (US)
Article number037803
JournalPhysical review letters
Issue number3
StatePublished - Jul 15 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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