Simulating confined particles with a flat density profile

Particle simulations confined by sharp walls usually develop an oscillatory density profile. For some applications, most notably soft matter liquids, this behavior is often unrealistic and one expects a monotonic density climb instead. To reconcile simulations with experiments, we propose mirror-and...

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Bibliographic Details
Published in:Physical review. E 2016-08, Vol.94 (2-1), p.021302-021302, Article 021302
Main Author: Korolkovas, Airidas
Format: Article
Language:English
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Summary:Particle simulations confined by sharp walls usually develop an oscillatory density profile. For some applications, most notably soft matter liquids, this behavior is often unrealistic and one expects a monotonic density climb instead. To reconcile simulations with experiments, we propose mirror-and-shift boundary conditions where each interface is mapped to a distant part of itself. The main result is that the particle density increases almost monotonically from zero to bulk, over a short distance of about one particle diameter. The method is applied to simulate a polymer brush in explicit solvent, grafted on a flat silicon substrate. The simulated density profile agrees favorably with neutron reflectometry measurements and self-consistent field theory results.
ISSN:2470-0045
2470-0053
DOI:10.1103/PhysRevE.94.021302