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Anisotropic de Gennes Narrowing in Confined Fluids

Nygård, Kim LU ; Buitenhuis, Johan ; Kagias, Matias LU orcid ; Jefimovs, Konstantins ; Zontone, Federico and Chushkin, Yuriy (2016) In Physical Review Letters 116(16).
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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author
; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
116
issue
16
article number
167801
publisher
American Physical Society
external identifiers
  • scopus:84964253325
ISSN
0031-9007
DOI
10.1103/PhysRevLett.116.167801
language
English
LU publication?
no
additional info
Publisher Copyright: © 2016 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »http://creativecommons.org/licenses/by/3.0/» 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.
id
eab561e5-04e1-4f52-8ce8-8e17cc4a72f2
date added to LUP
2023-11-27 09:09:08
date last changed
2024-06-05 16:15:43
@article{eab561e5-04e1-4f52-8ce8-8e17cc4a72f2,
  abstract     = {{<p>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.</p>}},
  author       = {{Nygård, Kim and Buitenhuis, Johan and Kagias, Matias and Jefimovs, Konstantins and Zontone, Federico and Chushkin, Yuriy}},
  issn         = {{0031-9007}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{16}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Anisotropic de Gennes Narrowing in Confined Fluids}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.116.167801}},
  doi          = {{10.1103/PhysRevLett.116.167801}},
  volume       = {{116}},
  year         = {{2016}},
}