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The hydrophobic gap at high hydrostatic pressures

DOI: 10.1002/anie.201706662 DOI Help

Authors: Florian J. Wirkert (TU Dortmund) , Christoph Hölzl (Universität Regensburg) , Michael Paulus (TU Dortmund) , Paul Salmen (TU Dortmund) , Metin Tolan (TU Dortmund) , Dominik Horinek (Universität Regensburg) , Julia Nase (TU Dortmund)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Angewandte Chemie International Edition

State: Published (Approved)
Published: August 2017
Diamond Proposal Number(s): 9224

Abstract: We gain new insight into the so-called hydrophobic gap, a molecularly thin region of decreased electron density at the interface between water and a solid hydrophobic surface, by X-ray reflectivity experiments and molecular dynamics simulations at different hydrostatic pressures. Pressure variation shows that the hydrophobic gap persists up to a pressure of 5 kbar. The depletion in the interfacial region is strongly decreasing with rising pressure, indicating that the interfacial region is compressed more strongly than bulk water. The decrease is most significant up to 2 kbar, beyond that, the pressure response of the depletion is less pronounced.

Journal Keywords: hydrophobic gap; high hydrostatic pressure; Xray reflectivity; MD simulations

Subject Areas: Chemistry, Physics


Instruments: I07-Surface & interface diffraction

Other Facilities: ID15A at ESRF; BL9 at DELTA

Added On: 24/08/2017 15:20

Discipline Tags:

Surfaces Physics Physical Chemistry Chemistry interfaces and thin films

Technical Tags:

Diffraction X-ray Reflectivity (XRR)