Equilibrium and Surface Rheology of Monolayers of Insoluble Polycations with Side Chains

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dc.contributor.authorMiranda, Beatriz
dc.contributor.authorHilles, Hani M.
dc.contributor.authorRubio, Ramon G.
dc.contributor.authorRitacco, Hernan
dc.contributor.authorRadic, Deodato
dc.contributor.authorGargallo, Ligia
dc.contributor.authorSferrazza, Michele
dc.contributor.authorOrtega, Francisco
dc.date.accessioned2024-01-10T12:38:44Z
dc.date.available2024-01-10T12:38:44Z
dc.date.issued2009
dc.description.abstractWe have studied monolayers of poly(n-tetradecyl 4-vinylpyridinium-co-4-vinylpyridine) bromide with different degrees of quaternization at the air-water interface. The isotherms (surface pressure vs area) present several phase transitions: at low monolayer coverage, there is a phase transition over a characteristic area that increases on increasing the quaternization degree. This behavior can be rationalized in terms of a mean-field theory of 2D semiflexible polymeric chains and could be an indication of a disorder-order transition from a 2D isotropic liquid (IL) at low surface concentration to a 2D nematic phase (N) at higher concentrations, Low-frequency oscillatory strain experiments show that at low surface coverage the monolayers exhibit highly nonlinear behavior, even for low strain amplitude, whereas at higher surface coverage the response is linear for strains higher than 20%. In addition, stress relaxation experiments show a minimum in the characteristic times that coincide with the transition area. These unexpected results at low surface coverage might be characteristic of the system or related to the fact that the oscillatory experiments do not strictly correspond to constant surface-coverage conditions. However, they are in agreement with high-frequency viscoelasticity, obtained by surface quasielastic light scattering, that shows that the dilational viscosity is higher at low surface concentration than for concentrations beyond the surface phase transition. At higher coverage, there is a second phase transition, after which the isotherms present hysteresis, which is not observed below. Ellipsometry indicates that, after this transition, the monolayer thicken, which may be related to 3D growth into a multilayer.
dc.description.funderMICINN
dc.description.funderCAM
dc.description.funderFondecyt
dc.fechaingreso.objetodigital2024-04-23
dc.format.extent8 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1021/la901762u
dc.identifier.issn0743-7463
dc.identifier.pubmedidMEDLINE:19689139
dc.identifier.urihttps://doi.org/10.1021/la901762u
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/77092
dc.identifier.wosidWOS:000271106600028
dc.information.autorucQuímica;Gargallo L;S/I;98194
dc.information.autorucQuímica;Miranda B;S/I;88586
dc.information.autorucQuímica;Radic D;S/I;49367
dc.issue.numero21
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final12568
dc.pagina.inicio12561
dc.publisherAMER CHEMICAL SOC
dc.revistaLANGMUIR
dc.rightsacceso restringido
dc.subjectISOTROPIC-NEMATIC TRANSITION
dc.subjectCONDENSED PHASE-TRANSITION
dc.subjectLANGMUIR-BLODGETT-FILMS
dc.subjectAQUEOUS KBR SOLUTION
dc.subjectAIR-WATER-INTERFACE
dc.subjectPOLYELECTROLYTE MONOLAYERS
dc.subjectPOLYMER-CHAINS
dc.subjectCOPOLYMERS
dc.subjectTEMPERATURE
dc.subjectORIENTATION
dc.titleEquilibrium and Surface Rheology of Monolayers of Insoluble Polycations with Side Chains
dc.typeartículo
dc.volumen25
sipa.codpersvinculados98194
sipa.codpersvinculados88586
sipa.codpersvinculados49367
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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