title: Mesoscopic Hamiltonian for the fluctuations of adsorbed Lennard-Jones liquid films.
abstract: We use Monte Carlo simulations of a Lennard-Jones fluid adsorbed on a short-range planar wall substrate to study the fluctuations in the thickness of the wetting layer, and we get a quantitative and consistent characterization of their mesoscopic Hamiltonian, H[ξ]. We have observed important finite-size effects, which were hampering the analysis of previous results obtained with smaller systems. The results presented here support an appealing simple functional form for H[ξ], close but not exactly equal to the theoretical nonlocal proposal made on the basis a generic density-functional analysis by Parry and coworkers. We have analyzed systems under different wetting conditions, as a proof of principle for a method that provides a quantitative bridge between the molecular interactions and the phenomenology of wetting films at mesoscopic scales.
authors.affiliation: Departamento de Física Fundamental, Universidad Nacional de Educación Distancia, Madrid, Spain and Instituto de Ciencia de Materiales de Madrid, CSIC, 28049, Madrid, Spain.
authors.forename: Eva M
authors.initials: EM
authors.lastname: Fernández
authors.affiliation: Instituto de Ciencia de Materiales de Madrid, CSIC, 28049, Madrid, Spain and Instituto de Ciencia de Materiales Nicolás Cabrera, Universidad Autońoma de Madrid, Madrid, 28049, Spain.
authors.forename: Enrique
authors.initials: E
authors.lastname: Chacón
authors.affiliation: Departamento de Química Física, Universidad Complutense de Madrid, 28040, Madrid, Spain.
authors.forename: Luis G
authors.initials: LG
authors.lastname: MacDowell
authors.affiliation: Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center IFIMAC and Instituto de Ciencia de Materiales Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid, 28049, Spain.
authors.forename: Pedro
authors.initials: P
authors.lastname: Tarazona