Towards understanding the behavior of polyelectrolyte–surfactant mixtures at the water/vapor interface closer to technologically-relevant conditions

2018 ◽  
Vol 20 (3) ◽  
pp. 1395-1407 ◽  
Author(s):  
Sara Llamas ◽  
Laura Fernández-Peña ◽  
Andrew Akanno ◽  
Eduardo Guzmán ◽  
Víctor Ortega ◽  
...  
Keyword(s):  
Water Vapor ◽  
Neutron Reflectometry ◽  
Fluid Interfaces ◽  
Surfactant Mixtures ◽  
Vapor Interface ◽  
Surface Tensiometry

The adsorption of technologically relevant polyelectrolyte–surfactant mixtures at fluid interfaces was studied by neutron reflectometry and surface tensiometry.

Behavior of the water/vapor interface of chitosan solutions with an anionic surfactant: effect of polymer–surfactant interactions

2020 ◽  
Vol 22 (40) ◽  
pp. 23360-23373
Author(s):  
Andrew Akanno ◽  
Eduardo Guzmán ◽  
Francisco Ortega ◽  
Ramón G. Rubio
Keyword(s):  
Water Vapor ◽  
Anionic Surfactant ◽  
Surfactant Mixtures ◽  
Vapor Interface ◽  
P Adsorption ◽  
Surfactant Effect ◽  
Surfactant Interactions ◽  
Polymer Surfactant ◽  
Oppositely Charged

Adsorption of chitosan–sodium laureth sulfate mixtures at the water/vapor interface appears very different to that of other oppositely charged polyelectrolyte–surfactant mixtures.

scholarly journals Electromechanics of the liquid water vapour interface

2020 ◽  
Vol 22 (19) ◽  
pp. 10676-10686 ◽  
Author(s):  
Chao Zhang ◽  
Michiel Sprik
Keyword(s):  
Water Vapor ◽  
Stress Tensor ◽  
Water Vapour ◽  
Surface Potential ◽  
Liquid Water ◽  
Maxwell Stress ◽  
Capillary Effect ◽  
Vapor Interface ◽  
Maxwell Stress Tensor ◽  
Anisotropic Stress

The response of the anisotropic stress at the liquid water vapor interface to a finite electric suggests that the surface potential of water can be seen as an electro-capillary effect coupled to the Maxwell stress tensor.

scholarly journals Two Different Scenarios for the Equilibration of Polycation—Anionic Solutions at Water–Vapor Interfaces

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 438 ◽  
Author(s):  
Eduardo Guzmán ◽  
Laura Fernández-Peña ◽  
Andrew Akanno ◽  
Sara Llamas ◽  
Francisco Ortega ◽  
...  
Keyword(s):  
Water Vapor ◽  
Vapor Interface ◽  
Interfacial Layers ◽  
Sodium Lauryl Ether Sulfate ◽  
Complex Interactions ◽  
Surfactant Interactions ◽  
Physico Chemical ◽  
Lauryl Ether ◽  
Shed Light ◽  
Dilational Rheology

The assembly in solution of the cationic polymer poly(diallyldimethylammonium chloride) (PDADMAC) and two different anionic surfactants, sodium lauryl ether sulfate (SLES) and sodium N-lauroyl-N-methyltaurate (SLMT), has been studied. Additionally, the adsorption of the formed complexes at the water–vapor interface have been measured to try to shed light on the complex physico-chemical behavior of these systems under conditions close to that used in commercial products. The results show that, independently of the type of surfactant, polyelectrolyte-surfactant interactions lead to the formation of kinetically trapped aggregates in solution. Such aggregates drive the solution to phase separation, even though the complexes should remain undercharged along the whole range of explored compositions. Despite the similarities in the bulk behavior, the equilibration of the interfacial layers formed upon adsorption of kinetically trapped aggregates at the water–vapor interface follows different mechanisms. This was pointed out by surface tension and interfacial dilational rheology measurements, which showed different equilibration mechanisms of the interfacial layer depending on the nature of the surfactant: (i) formation layers with intact aggregates in the PDADMAC-SLMT system, and (ii) dissociation and spreading of kinetically trapped aggregates after their incorporation at the fluid interface for the PDADMAC-SLES one. This evidences the critical impact of the chemical nature of the surfactant in the interfacial properties of these systems. It is expected that this work may contribute to the understanding of the complex interactions involved in this type of system to exploit its behavior for technological purposes.

X-ray reflectivity of a polymer monolayer at the water/vapor interface

1991 ◽  
Vol 95 (17) ◽  
pp. 6628-6632 ◽  
Author(s):  
M. L. Schlossman ◽  
D. K. Schwartz ◽  
E. H. Kawamoto ◽  
G. J. Kellogg ◽  
P. S. Pershan ◽  
...  
Keyword(s):  
Water Vapor ◽  
Vapor Interface ◽  
X Ray

Quantum chemical analysis of thermodynamics of 2D cluster formation of alkanes at the water/vapor interface in the presence of aliphatic alcohols

2015 ◽  
Vol 17 (43) ◽  
pp. 28901-28920 ◽  
Author(s):  
Yu. B. Vysotsky ◽  
E. S. Kartashynska ◽  
E. A. Belyaeva ◽  
V. B. Fainerman ◽  
D. Vollhardt ◽  
...  
Keyword(s):  
Water Vapor ◽  
Chemical Analysis ◽  
Quantum Chemical ◽  
Cluster Formation ◽  
Chemical Model ◽  
Ionic Surfactants ◽  
Quantum Chemical Analysis ◽  
Vapor Interface ◽  
Monolayer Formation ◽  
Quantum Chemical Model

A quantum-chemical model for alkane monolayer formation is developed at the water/vapor interface containing non-ionic surfactants.

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