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Título: | Anomalous Dielectric Behavior of Water in Ionic Newton Black Films |
Autor: | Faraudo, Jordi CSIC ORCID; 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 publicación: | 10-jun-2004 | Editor: | American Physical Society | Citación: | Phys. Rev. Lett. 92(23): 236102 (2004) | Resumen: | The 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. | Descripción: | 4 pages, 2 figures.-- PMID: 15245172 [PubMed].-- PACS nrs.: 68.15.+e, 02.70.Ns, 77.22.Ch, 82.45.Mp. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.92.236102 | URI: | http://hdl.handle.net/10261/8450 | DOI: | 10.1103/PhysRevLett.92.236102 | ISSN: | 0031-9007 |
Aparece en las colecciones: | (ICMAB) Artículos |
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