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

Nygard, K.; Perret, E.; van der Veen, J.F.; Sarman, S.; Buitenhuis, J.; Chodankar, S.; Kjellander, R.

doi:10.1103/PhysRevLett.108.037802

Journal Article

PreJuSER-19750

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

Nygard, K. ; Kjellander, R. ; Sarman, S. ; Chodankar, S. ; Perret, E. ; Buitenhuis, J.FZJ* ; van der Veen, J. F.

2012
APS College Park, Md.

Physical review letters 108, 037802 (2012) [10.1103/PhysRevLett.108.037802]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7400 doi:10.1103/PhysRevLett.108.037802

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.

Keyword(s): J

Classification:

Physics, Multidisciplinary

Note: The experiment was carried out at the cSAXS beam line of the Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland. We thank the beam line staff for assistance. One of us (R. K.) gratefully acknowledges support from the Swedish Research council. The calculations in this work were supported by the Swedish National Infrastructure for Computing (SNIC 001-09-152) via PDC.

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