Anisotropic de Gennes Narrowing in Confined Fluids.
- Nygård K Department of Chemistry and Molecular Biology, University of Gothenburg, SE-41296 Gothenburg, Sweden.
- Buitenhuis J Forschungszentrum Jülich, ICS-3, D-52425 Jülich, Germany.
- Kagias M Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
- Jefimovs K Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
- Zontone F European Synchrotron Radiation Facility, 71 Avenue des Martyrs, F-38000 Grenoble, France.
- Chushkin Y European Synchrotron Radiation Facility, 71 Avenue des Martyrs, F-38000 Grenoble, France.
- 2016-05-07
Published in:
- Physical review letters. - 2016
English
The collective diffusion of dense fluids in spatial confinement is studied by combining high-energy (21 keV) x-ray photon correlation spectroscopy and small-angle x-ray scattering from colloid-filled microfluidic channels. We find the structural relaxation in confinement to be slower compared to the bulk. The collective dynamics is wave vector dependent, akin to the de Gennes narrowing typically observed in bulk fluids. However, in stark contrast to the bulk, the structure factor and de Gennes narrowing in confinement are anisotropic. These experimental observations are essential in order to develop a microscopic theoretical description of collective diffusion of dense fluids in confined geometries.
- Language
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- English
- Open access status
- hybrid
- Identifiers
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- DOI 10.1103/PhysRevLett.116.167801
- PMID 27152823
- Persistent URL
- https://sonar.ch/global/documents/278326
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