Thermally excited capillary waves at vapor/liquid interfaces of water-alcohol mixtures

Details Thermally excited capillary waves at vapor/liquid interfaces of water-alcohol mixtures Thermally excited capillary waves at vapor/liquid interfaces of water-alcohol mixtures

2009-04-15

arxiv.org/abs/0904.2412v1

Journal of Physics -- Condensed Matter Vol 21, Issue 11, article Number: 115105, Published: 2009

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1088/0953-8984/21/11/115105

The density profiles of liquid/vapor interfaces of water-alcohol (methanol, ethanol and propanol) mixtures were studied by surface sensitive synchrotron X-ray scattering techniques. X-ray reflectivity and diffuse scattering measurements, from the pure and mixed liquids, were analyzed in the framework of capillary-wave theory to address the characteristics length-scales of the intrinsic roughness and the shortest capillary-wavelength (alternatively, the upper wave-vector cutoff in capillary wave theory). Our results establish that the intrinsic roughness is dominated by average interatomic distances. The extracted effective upper wave-vector cutoff indicates capillary wave theory breaks-down at distances on order of bulk correlation lengths.

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