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dc.contributor.author
Cuenca, Victor Ezequiel  
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Fernández Leyes, Marcos Daniel  
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Falcone, Ruben Dario  
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Correa, Nestor Mariano  
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Langevin, Dominique  
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Ritacco, Hernán Alejandro  
dc.date.available
2020-03-16T21:07:38Z  
dc.date.issued
2019-06  
dc.identifier.citation
Cuenca, Victor Ezequiel; Fernández Leyes, Marcos Daniel; Falcone, Ruben Dario; Correa, Nestor Mariano; Langevin, Dominique; et al.; Interfacial Dynamics and its relations with "negative" surface viscosities measured at water-air interfaces covered with a cationic surfactant; American Chemical Society; Langmuir; 35; 25; 6-2019; 8333-8343  
dc.identifier.issn
0743-7463  
dc.identifier.uri
http://hdl.handle.net/11336/99716  
dc.description.abstract
We studied the dynamics of a cationic surfactant monolayer, Gemini 12-2-12, at the air-water interface for surfactant aqueous solutions at concentrations below the critical micelle concentration. We present surface rheology experiments performed in a Langmuir trough by the oscillatory barrier technique. From these, we found negative surface viscosities at certain frequencies. We demonstrate that this unphysical result is a consequence of an unconsidered surfactant dynamics within the interfacial region. By surface pressure relaxation experiments, after a sudden modification of the interfacial area and by dynamic surface tension and surface potential measurements, several relaxation phenomena and relaxation times were identified. We found that surfactant adsorption and desorption processes are asymmetric: the characteristic times and the number of processes involved in the mechanisms of adsorption and desorption are different. This asymmetry invalidates the usual data analysis procedure that leads to the negative viscosities. Similar mechanisms could be at the origin of the negative viscosities reported in other systems, a possibility that remains to be explored.  
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
SURFACTANTS  
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SURFACE RHEOLOGY  
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NEGATIVE VISCOSITIES  
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Otras Ciencias Físicas  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Interfacial Dynamics and its relations with "negative" surface viscosities measured at water-air interfaces covered with a cationic surfactant  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2020-02-26T19:37:15Z  
dc.journal.volume
35  
dc.journal.number
25  
dc.journal.pagination
8333-8343  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Washington DC  
dc.description.fil
Fil: Cuenca, Victor Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; Argentina  
dc.description.fil
Fil: Fernández Leyes, Marcos Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; Argentina  
dc.description.fil
Fil: Falcone, Ruben Dario. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina  
dc.description.fil
Fil: Correa, Nestor Mariano. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Langevin, Dominique. Université Paris Sud; Francia  
dc.description.fil
Fil: Ritacco, Hernán Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; Argentina  
dc.journal.title
Langmuir  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://pubs.acs.org/doi/10.1021/acs.langmuir.9b00534  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/acs.langmuir.9b00534