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 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.

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.

Equilibration of a Polycation–Anionic Surfactant Mixture at the Water/Vapor Interface

Langmuir ◽  
2018 ◽  
Vol 34 (25) ◽  
pp. 7455-7464 ◽  
Author(s):  
Andrew Akanno ◽  
Eduardo Guzmán ◽  
Laura Fernández-Peña ◽  
Sara Llamas ◽  
Francisco Ortega ◽  
...  
Keyword(s):  
Water Vapor ◽  
Anionic Surfactant ◽  
Surfactant Mixture ◽  
Vapor Interface

scholarly journals An investigation of chitosan and sodium dodecyl sulfate interactions in acetic media

2016 ◽  
Vol 81 (5) ◽  
pp. 575-587 ◽  
Author(s):  
Lidija Petrovic ◽  
Jelena Milinkovic ◽  
Jadranka Fraj ◽  
Sandra Bucko ◽  
Jaroslav Katona
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Cationic Polyelectrolyte ◽  
Mass Ratio ◽  
Surfactant Mixtures ◽  
Surfactant Complex ◽  
Wide Range ◽  
Dodecyl Sulfate ◽  
Polymer Surfactant ◽  
Oppositely Charged

Polymer/surfactant association is a cooperative phenomenon where surfactant binds to the polymer in the form of aggregates, usually through electrostatic or hydrophobic forces. As already known, polyelectrolytes may interact with oppositely charged surfactants through electrostatic attraction that results in polymer/surfactant complex formation. This behavior could be desirable in wide range of application of polymer/surfactant mixtures, such as improving colloid stability, gelling, emulsification and microencapsulation. In the present study surface tension, turbidity, viscosity and electrophoretic mobility measurements were used to investigate interactions of cationic polyelectrolyte chitosan (Ch) and oppositely charged anionic surfactant, sodium dodecyl sulfate (SDS), in buffered water. Obtained results show the presence of interactions that lead to Ch/SDS complexes formation at all investigated pH and for all investigated polymer concentrations. Mechanisms of interaction, as well as characteristics of formed Ch/SDS complexes, are highly dependent on their mass ratio in the mixtures, while pH has no significant influence.

Controlling structure in associating polymer-surfactant mixtures

2007 ◽  
Vol 79 (8) ◽  
pp. 1419-1434 ◽  
Author(s):  
L. Piculell ◽  
A. Svensson ◽  
J. Norrman ◽  
J. S. Bernardes ◽  
L. Karlsson ◽  
...  
Keyword(s):  
Charge Density ◽  
Chain Length ◽  
Surfactant Mixtures ◽  
Simplified Approach ◽  
Ongoing Work ◽  
Minimum Number ◽  
Polymer Surfactant ◽  
Oppositely Charged ◽  
As Effects ◽  
Associating Polymer

Structures of concentrated mixtures of associating polymer-surfactant mixtures are important in many technical applications. Yet an in-depth understanding of how molecular parameters affect these structures is lacking. We here summarize the results of ongoing work using a novel simplified approach to the study of associating oppositely charged polymer-surfactant mixtures, introducing a minimum number of components to the various mixtures. The results illustrate the relations between systems with and without polyions, as well as effects of systematic changes of parameters such as surfactant chain length, polyion length, polyion charge density, and the charge density of the surfactant aggregate.

Heat capacities and volumes in aqueous polymer and polymer–surfactant solutions

1987 ◽  
Vol 65 (5) ◽  
pp. 990-995 ◽  
Author(s):  
Gérald Perron ◽  
Josée Francoeur ◽  
Jacques E. Desnoyers ◽  
Jan C. T. Kwak
Keyword(s):  
Thermodynamic Properties ◽  
Chain Length ◽  
Polymer Concentration ◽  
Heat Capacities ◽  
Aqueous Mixtures ◽  
Alkyltrimethylammonium Bromides ◽  
Aqueous Polymer ◽  
Surfactant Interactions ◽  
Polymer Surfactant ◽  
Polymer Interaction

The apparent molar volumes and heat capacities of aqueous mixtures of neutral polymers and ionic surfactants were measured at 25 °C. The polymers chosen were poly(vinylpyrrolidone) (PVP) and poly(ethyleneoxide) (PEO) and the surfactants were the C8, C10, and C12 homologs of sodium alkylsulfates and the C10, C12, and C16 homologs of alkyltrimethylammonium bromides. The polymer–surfactant interactions depend on the nature of both components and on the chain length of the surfactant. The thermodynamic properties of the cationic surfactants are essentially the same in the absence and presence of polymer indicating little surfactant–polymer interaction. On the other hand, the thermodynamic properties of anionic surfactants are shifted, upon the addition of polymers, in the direction of enhanced hydrophobic association. The effect increases with the surfactant chain length and with the polymer concentration. The effect is larger with PVP than with PEO.

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