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Nygård K, Buitenhuis J, Kagias M, et al. Anisotropic de Gennes Narrowing in Confined Fluids. Phys Rev Lett. 2016;116(16):167801doi: 10.1103/PhysRevLett.116.167801.
Nygård, K., Buitenhuis, J., Kagias, M., Jefimovs, K., Zontone, F., & Chushkin, Y. (2016). Anisotropic de Gennes Narrowing in Confined Fluids. Physical review letters, 116(16), 167801. https://doi.org/10.1103/PhysRevLett.116.167801
Nygård, Kim, et al. "Anisotropic de Gennes Narrowing in Confined Fluids." Physical review letters vol. 116,16 (2016): 167801. doi: https://doi.org/10.1103/PhysRevLett.116.167801
Nygård K, Buitenhuis J, Kagias M, Jefimovs K, Zontone F, Chushkin Y. Anisotropic de Gennes Narrowing in Confined Fluids. Phys Rev Lett. 2016 Apr 22;116(16):167801. doi: 10.1103/PhysRevLett.116.167801. Epub 2016 Apr 21. PMID: 27152823.
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Phys Rev Lett. 2016 Apr 22;116(16):167801. doi: 10.1103/PhysRevLett.116.167801. Epub 2016 Apr 21.

Anisotropic de Gennes Narrowing in Confined Fluids.

Physical review letters

Kim Nygård, Johan Buitenhuis, Matias Kagias, Konstantins Jefimovs, Federico Zontone, Yuriy Chushkin

Affiliations

  1. Department of Chemistry and Molecular Biology, University of Gothenburg, SE-41296 Gothenburg, Sweden.
  2. Forschungszentrum Jülich, ICS-3, D-52425 Jülich, Germany.
  3. Paul Scherrer Institut, CH-5232 Villigen, Switzerland.
  4. Institute for Biomedical Engineering, UZH/ETH Zürich, CH-8092 Zürich, Switzerland.
  5. European Synchrotron Radiation Facility, 71 Avenue des Martyrs, F-38000 Grenoble, France.

PMID: 27152823 DOI: 10.1103/PhysRevLett.116.167801

Abstract

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.

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