• Open Access

Anisotropic de Gennes Narrowing in Confined Fluids

Kim Nygård, Johan Buitenhuis, Matias Kagias, Konstantins Jefimovs, Federico Zontone, and Yuriy Chushkin
Phys. Rev. Lett. 116, 167801 – Published 21 April 2016

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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  • Received 19 November 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.167801

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft MatterCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Kim Nygård1,*, Johan Buitenhuis2, Matias Kagias3,4, Konstantins Jefimovs3,4, Federico Zontone5, and Yuriy Chushkin5

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

  • *kim.nygard@chem.gu.se

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Issue

Vol. 116, Iss. 16 — 22 April 2016

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