Structure and Depletion at Fluoro- and Hydro-carbon/Water Liquid/Liquid Interfaces

Details Structure and Depletion at Fluoro- and Hydro-carbon/Water Liquid/Liquid Interfaces Structure and Depletion at Fluoro- and Hydro-carbon/Water Liquid/Liquid Interfaces

2008-07-18

arxiv.org/abs/0807.3048v1

Physics

Condensed Matter

Soft Condensed Matter

28 pages, 9 figures, main text plus supplementary, to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.101.076102

The results of x-ray reflectivity studies of two oil/water (liquid/liquid) interfaces are inconsistent with recent predictions of the presence of a vapor-like depletion region at hydrophobic/aqueous interfaces. One of the oils, perfluorohexane, is a fluorocarbon whose super-hydrophobic interface with water provides a stringent test for the presence of a depletion layer. The other oil, heptane, is a hydrocarbon and, therefore, is more relevant to the study of biomolecular hydrophobicity. These results are consistent with the sub-angstrom proximity of water to soft hydrophobic materials.

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