Person: Guzmán Solís, Eduardo
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First Name
Eduardo
Last Name
Guzmán Solís
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Física
Area
Química Física
Identifiers
2 results
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Item Equilibration of a Polycation–Anionic Surfactant Mixture at the Water/Vapor Interface(Langmuir, 2018) Akanno, Andrew; Guzmán Solís, Eduardo; Fernández Peña, Laura; Llamas, Sara; Ortega Gómez, Francisco; González Rubio, RamónThe adsorption of concentrated poly(diallyldimethylammonium chloride) (PDADMAC)–sodium lauryl ether sulfate (SLES) mixtures at the water/vapor interface has been studied by different surface tension techniques and dilational viscoelasticity measurements. This work tries to shed light on the way in which the formation of polyelectrolyte–surfactant complexes in the bulk affects the interfacial properties of mixtures formed by a polycation and an oppositely charged surfactant. The results are discussed in terms of a two-step adsorption–equilibration of PDADMAC–SLES complexes at the interface, with the initial stages involving the diffusion of kinetically trapped aggregates formed in the bulk to the interface followed by the dissociation and spreading of such aggregates at the interface. This latter process becomes the main contribution to the surface tension decrease. This work aids our understanding of the most fundamental basis of the physicochemical behavior of concentrated polyelectrolyte–surfactant mixtures which present complex bulk and interfacial interactions with interest in both basic and applied sciences.Item Towards understanding the behavior of polyelectrolyte–surfactant mixtures at the water/vapor interface closer to technologically-relevant conditions(Physical Chemistry Chemical Physics, 2018) Llamas, Sara; Fernández-Peña, Laura; Akanno, Andrew; Guzmán Solís, Eduardo; Ortega, Víctor; Ortega Gómez, Francisco; García Csaky, Aurelio; Campbell, Richard ; González Rubio, RamónPolyelectrolyte–surfactant mixtures and their interactions with fluid interfaces are an important research field due to their use in technological applications. Most of the existing knowledge on these systems is based on models in which the polyelectrolyte concentration is around 50 times lower than that used in commercial formulations. The present work marks a step to close the gap on the understanding of their behavior under more practically-relevant conditions. The adsorption of concentrated mixtures of poly(diallyldimethyl-ammonium) chloride and sodium N-lauroyl-N-methyltaurate at the water/vapor interface with a crude mixing protocol has been studied by different surface tension techniques, Brewster angle microscopy, neutron reflectometry, and several bulk characterization techniques. Kinetically-trapped aggregates formed during mixing influence the interfacial morphology of mixtures produced in the equilibrium one-phase region, yet fluctuations in the surface tension isotherm result depending on the tensiometric technique applied. At low bulk surfactant concentrations, the free surfactant concentration is very low, and the interfacial composition matches the trend of the bulk complexes, which is a behavior that has not been observed in studies on more dilute mixtures. Nevertheless, a transition to synergistic co-adsorption of complexes and free surfactant is observed at the higher bulk surfactant concentrations studied. This transition appears to be a special feature of these more concentrated mixtures, which deserves attention in future studies of systems with additional components.