Electro-optic Kerr effect in the study of mixtures of oppositely charged colloids. The case of polymer-surfactant mixtures in aqueous solutions

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

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

Journal of the Serbian Chemical Society ◽

10.2298/jsc151119024p ◽

2016 ◽

Vol 81 (5) ◽

pp. 575-587 ◽

Cited By ~ 8

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.

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Controlling structure in associating polymer-surfactant mixtures

Pure and Applied Chemistry ◽

10.1351/pac200779081419 ◽

2007 ◽

Vol 79 (8) ◽

pp. 1419-1434 ◽

Cited By ~ 20

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.

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