How water meets a very hydrophobic surface

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

doi:10.1103/PhysRevLett.105.037803

How water meets a very hydrophobic surface

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

Northwestern University

Research output: Contribution to journal › Article › peer-review

59 Citations (Scopus)

Abstract

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 language	English
Article number	037803
Journal	Physical review letters
Volume	105
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.105.037803
Publication status	Published - Jul 15 2010

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.105.037803

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