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

Ritacco, Hernán

doi:10.1016/j.cis.2017.05.015

Cited by 14 publications

(15 citation statements)

References 154 publications

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“…In a near future we will continue studying these surfactant mixtures focusing on structural changes as a function of micelle composition. In doing so we will introduce a very sensitive technique, electric birefringence [6], which could be capable of discerning the presence of different micelles (with different surface charges and membrane viscoelasticities), in order to explore the validity of the final statement of this conclusion about the coexistence of two types of mixed micelles.…”

Section: Discussionmentioning

confidence: 99%

“…In almost all these applications surfactant mixtures are commonly used instead of pure surfactants, because these mixtures often have better performance, e.g lower CMC's, than one-component systems [1,3,4]. It is worth mentioning here that the mixtures include not only mixtures of different surfactants but also surfactants with polymers, polyelectrolytes, proteins, micro and nano particles [5,6].…”

Section: Introductionmentioning

confidence: 99%

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The aqueous Triton X-100 – dodecyltrimethylammonium bromidemicellar mixed system. Experimental results and thermodynamic analysis

Serafini

Fernández-Leyes

Sánchez

et al. 2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The micellization process of the aqueous mixed system Triton X-100 (TX100) -Dodecyltrimethylammonium Bromide (DTAB) was studied with a battery of procedures: surface tension, static and dynamic light scattering and ion-selective electrodes. Results were also analysed with two thermodynamic procedures. The system shows some changes in its behaviour with changing the mole fraction of DTAB, DTAB, in the whole surfactant mixture. For DTAB  0.40 micelles are predominantly TX100 with scarce solubilized DTA + ions, and TX100 acts as a nearly ideal solvent. In the range 0.50  DTAB  0.75 it seems that none of the components acts as a solvent, and above DTAB  0.75 there are abrupt changes in the size and electrophoretic mobility of micelles.These phenomena have been interpreted in the light of the thermodynamic results and some TX100-ionic surfactant mixtures of literature.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The aqueous Triton X-100 – dodecyltrimethylammonium bromidemicellar mixed system. Experimental results and thermodynamic analysis

Serafini

Fernández-Leyes

Sánchez

et al. 2018

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…When an oppositely charged surfactant is added to a polyelectrolyte solution it first progressively replaces the polyelectrolyte counterions in the vicinity of the macromolecular main chain. Generally, this process does not conduct to observable changes in the bulk properties of the system as could be followed with commonly used techniques as conductivity or light scattering, however they can be detected by more sensitive, and less common techniques such as Electric birefringence [9][10][11][12][13]. This situation changes when a certain surfactant concentration, the critical aggregation concentration (cac) is reached.…”

Section: Introductionmentioning

confidence: 99%

Effect of surfactant concentration on the responsiveness of a thermoresponsive copolymer/surfactant mixture with potential application on “Smart” foams formulations

Lencina

Miconi

Fernández-Leyes

et al. 2018

Journal of Colloid and Interface Science

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The Cop-L/DTAB mixtures were capable of producing thermoresponsive foams but only in a very narrow surfactant concentration (c) range, 0.3 < c< 1.6 mM. The responsiveness is due to a modification of the interfacial compression elasticity induced by conformational changes of the Polyeletrolyte/surfactant aggregates at the interface. This is possible only for c < 1.6 because higher surfactant concentrations induce the polymer collapse at all temperatures, eliminating the thermal responsiveness.

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“…Recently, the giant Kerr effect in the optically isotropic blue phase of LCs received substantial interest from industry and academia. [16] Another class of fluids with anomalous Kerr effect properties are complex ionic fluids such as aqueous solutions of polyelectrolytes [17,18,19] or aqueous micellar solutions of ionic surfactants. [20] Despite their high electric conductivity due to ion migration in the electric field it is possible to measure the Kerr effect in these systems by transient pulse-or ac-electric field techniques.…”

Section: Introductionmentioning

confidence: 99%

Large Electro‐Optic Kerr Effect in Ionic Liquid Crystals: Connecting Features of Liquid Crystals and Polyelectrolytes

et al. 2018

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The electro-optic Kerr effect in simple dipolar fluids such as nitrobenzene has been widely applied in electro-optical phase modulators and light shutters. In 2005, the discovery of the large Kerr effect in liquid-crystalline blue phases (Y. Hisakado et al., Adv. Mater. 2005, 17, 96-98.) gave new directions to the search for advanced Kerr effect materials. Even though the Kerr effect is present in all transparent and optically isotropic media, it is well known that the effect can be anomalously large in complex fluids, namely in the isotropic phase of liquid crystals or in polyelectrolyte solutions. Herein, it is shown that the Kerr effect in the isotropic phase of ionic liquid crystals combines the effective counterion polarization mechanism found in polyelectrolytes and the unique pretransitional growth of the Kerr constant found in the isotropic phase of nematic liquid crystals. Maximum Kerr constants in the order of several 10 m V (ten times higher than the Kerr constant of the toxic nitrobenzene and less temperature sensitive than Kerr constants of nematic liquid crystals) make ionic liquid crystals attractive as new class of functional materials in low-speed Kerr effect applications.

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

Cited by 14 publications

References 154 publications

The aqueous Triton X-100 – dodecyltrimethylammonium bromidemicellar mixed system. Experimental results and thermodynamic analysis

The aqueous Triton X-100 – dodecyltrimethylammonium bromidemicellar mixed system. Experimental results and thermodynamic analysis

Effect of surfactant concentration on the responsiveness of a thermoresponsive copolymer/surfactant mixture with potential application on “Smart” foams formulations

Large Electro‐Optic Kerr Effect in Ionic Liquid Crystals: Connecting Features of Liquid Crystals and Polyelectrolytes

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