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Anisotropic de Gennes Narrowing in Confined Fluids

Journal article
Authors Kim Nygård
Johan Buitenhuis
Matias Kagias
Konstantins Jefimovs
Federico Zontone
Yuriy Chushkin
Published in Physical Review Letters
Volume 116
Issue 16
Pages artikel nr 167801
ISSN 0031-9007
Publication year 2016
Published at Department of Chemistry and Molecular Biology
Pages artikel nr 167801
Language en
Links dx.doi.org/10.1103/PhysRevLett.116....
https://gup.ub.gu.se/file/190911
Keywords Colloid dispersion, confined fluid, liquid structure, diffusion, pair distribution, x-ray scattering, SAXS, XPCS
Subject categories Condensed Matter Physics, Surfaces and interfaces, Liquid physics, Mesoscopic physics, Physical Chemistry, Surface and colloid chemistry, Chemical physics, Statistical mechanics

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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