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dc.contributor.author Galassi, Vanesa Viviana
dc.contributor.author del Popolo, Mario Gabriel
dc.contributor.author Fischer, Thomas M.
dc.contributor.author Wilke, Natalia
dc.date.available 2018-08-29T15:46:39Z
dc.date.issued 2017-06
dc.identifier.citation Galassi, Vanesa Viviana; del Popolo, Mario Gabriel; Fischer, Thomas M.; Wilke, Natalia; Molecular explanation for the abnormal flux of material into a Hot Spot in Ester Monolayers; American Chemical Society; Journal of Physical Chemistry B; 121; 22; 6-2017; 5621-5632
dc.identifier.issn 1520-6106
dc.identifier.uri http://hdl.handle.net/11336/57512
dc.description.abstract Langmuir monolayers of certain surfactants show a negative derivative of the surface pressure with respect to temperature. In these monolayers, a local temperature gradient leads to local yielding of the solid phase to a kinetically flowing liquid, so that the material flows toward the hotter regions that act as sinks. The accumulation of material leads to the formation of nonequilibrium multilamellar bubbles of different sizes. Here we investigate the molecular factors leading to such a peculiar behavior. First, we identify the required structural molecular moieties, and second we vary the composition of the subphase in order to analyze its influence. We conclude that esters appear to be unique in two key aspects: they form monolayers whose compression isotherms shift to lower areas as the temperature increases, and thus collapse into a hot spot; and they bind weakly to the aqueous subphase, i.e., water does not attach to the monolayer at the molecular level, but only supports it. Molecular simulations for a selected system confirm and help explain the observed behavior: surfactant molecules form a weak hydrogen bonding network, which is disrupted upon heating, and also the molecular tilting changes with temperature, leading to changes in the film density.
dc.format application/pdf
dc.language.iso eng
dc.publisher American Chemical Society
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject NEGATIVE PYROBARIC COEFICIENT
dc.subject NEGATIVE THERMAL EXPANSIVITY
dc.subject ESTERS THIN FILMS
dc.subject ABNORMAL THERMAL BEHAVIOR
dc.subject.classification Astronomía
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Molecular explanation for the abnormal flux of material into a Hot Spot in Ester Monolayers
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-08-27T18:57:23Z
dc.identifier.eissn 1520-5207
dc.journal.volume 121
dc.journal.number 22
dc.journal.pagination 5621-5632
dc.journal.pais Estados Unidos
dc.description.fil Fil: Galassi, Vanesa Viviana. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales; Argentina
dc.description.fil Fil: del Popolo, Mario Gabriel. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales; Argentina
dc.description.fil Fil: Fischer, Thomas M.. University of Bayreuth; Alemania
dc.description.fil Fil: Wilke, Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Química Biológica de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Centro de Investigaciones en Química Biológica de Córdoba; Argentina
dc.journal.title Journal of Physical Chemistry B
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/abs/10.1021/acs.jpcb.7b00949
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/acs.jpcb.7b00949
dc.conicet.fuente individual


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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)