Microscopic determination of correlations in the fluid interfacial region in the presence of liquid-gas asymmetry

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dc.contributor.author Parry, A. O.
dc.contributor.author Rascón, Carlos
dc.date.accessioned 2019-11-15T12:07:16Z
dc.date.available 2019-11-15T12:07:16Z
dc.date.issued 2019-11
dc.identifier.bibliographicCitation Parry, A.O., Rascón, C. (2019). Microscopic determination of correlations in the fluid interfacial region in the presence of liquid-gas asymmetry. Physical Review E, 100 (5) 052801
dc.identifier.issn 2470-0053 (online)
dc.identifier.issn 2470-0045 (print)
dc.identifier.uri http://hdl.handle.net/10016/29177
dc.description.abstract In a recent article, we showed how the properties of the density-density correlation function and its integral, the local structure factor, in the fluid interfacial region, in systems with short-ranged forces, can be understood microscopically by considering the resonances of the local structure factor [A. O. Parry and C. Rascón, Nat. Phys. 15, 287 (2019)]. Here, we illustrate, using mean-field square-gradient theory and the more microscopic Sullivan density functional model, and how this approach generalizes when there is liquid-gas asymmetry, i.e., when the bulk correlation lengths of the coexisting liquid and gas phases are different. In particular, we are able to express the correlation function exactly as a simple average of contributions arising from two effective Ising-symmetric systems referred to as the symmetric gas and symmetric liquid. When combined with our earlier results, this generates analytical approximations for the correlation function and the local structure factor, which are near indistinguishable from the numerical solution to the Ornstein-Zernike equations over the whole range of wave vectors. Our results highlight how asymmetry affects the correlation function structure and describes the crossover from a long-ranged Goldstone mode to short-ranged properties determined by the local density as the wave vector increases.
dc.description.sponsorship A.O.P. acknowledges the EPSRC, UK for Grant No. EP/L020564/1 (multiscale analysis of complex interfacial phenomena). C.R. acknowledges the support from Grant No. PGC2018-096606-B-I00 (MCIU/AEI/FEDER, UE).
dc.format.extent 10
dc.language.iso eng
dc.publisher American Physical Society
dc.rights © 2019 American Physical Society
dc.title Microscopic determination of correlations in the fluid interfacial region in the presence of liquid-gas asymmetry
dc.type article
dc.subject.eciencia Matemáticas
dc.identifier.doi https://doi.org/10.1103/PhysRevE.100.052801
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. PGC2018-096606-B-I00
dc.type.version publishedVersion
dc.identifier.publicationfirstpage 052801-1
dc.identifier.publicationissue 5
dc.identifier.publicationlastpage 052801-10
dc.identifier.publicationtitle Physical Review E
dc.identifier.publicationvolume 100
dc.identifier.uxxi AR/0000024032
dc.contributor.funder Engineering and Physical Sciences Research Council (EPSRC)
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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