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Anomalous Dielectric Behavior of Water in Ionic Newton Black Films

AutorFaraudo, Jordi ; Bresme, Fernando
Palabras clave[PACS] Liquid thin films
[PACS] Molecular dynamics and particle methods
[PACS] Permittivity (dielectric function)
[PACS] Thin layers, films, monolayers, membranes
Fecha de publicación10-jun-2004
EditorAmerican Physical Society
CitaciónPhys. Rev. Lett. 92(23): 236102 (2004)
ResumenThe electrostatics of two charged surfactant layers in aqueous media (surfactant/water/surfactant films) is investigated using molecular dynamics simulations. In the films studied (with a surfactant-surfactant distance from ~35 Å to contact) we observe an anomalous dielectric response of water. The electrostatic potential Φ(z) inside the aqueous core of the films (containing bulk water with ρ = 1 g/cm3) is completely different from that expected for a film containing a dielectric medium with the dielectric constant of water. In addition, our results are not consistent with a local relation between the water polarization Pz(z) and the electric field Ez(z). The polarization Pz(z) is maximum at the interfaces (due to solvent molecules forming part of the structure of the surfactant layers) and decays from the interfaces inside the aqueous core with a decay length of order of ~10 Å.
Descripción4 pages, 2 figures.-- PMID: 15245172 [PubMed].-- PACS nrs.: 68.15.+e, 02.70.Ns, 77.22.Ch, 82.45.Mp.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.92.236102
URIhttp://hdl.handle.net/10261/8450
DOI10.1103/PhysRevLett.92.236102
ISSN0031-9007
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