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Anisotropic Pair Correlations and Structure Factors of Confined Hard-Sphere Fluids: An Experimental and Theoretical Study

Journal article
Authors Kim Nygård
Roland Kjellander
Sten Sarman
S. Chodankar
E. Perret
J. Buitenhuis
J. F. van der Veen
Published in Physical Review Letters
Volume 108
Issue 3
Pages artikelns längd: 5 s.
ISSN 0031-9007
Publication year 2012
Published at Department of Chemistry and Molecular Biology
Pages artikelns längd: 5 s.
Language en
Links prl.aps.org/abstract/PRL/v108/i3/e0...
Keywords Colloid dispersion, liquid structure, inhomogeneous fluid, pair distribution, integral equation theory, SAXS, x-ray scattering
Subject categories Condensed Matter Physics, Surfaces and interfaces, Liquid physics, Mesoscopic physics, Physical Chemistry, Surface and colloid chemistry, Chemical physics, Theoretical Chemistry, Statistical mechanics

Abstract

We address the fundamental question: how are pair correlations and structure factors of hard-sphere fluids affected by confinement between hard planar walls at close distance? For this purpose, we combine x-ray scattering from colloid-filled nanofluidic channel arrays and first-principles inhomogeneous liquid-state theory within the anisotropic Percus-Yevick approximation. The experimental and theoretical data are in remarkable agreement at the pair-correlation level, providing the first quantitative experimental verification of the theoretically predicted confinement-induced anisotropy of the pair-correlation functions for the fluid. The description of confined fluids at this level provides, in the general case, important insights into the mechanisms of particle-particle interactions in dense fluids under confinement.

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