Dye solubilization in polyelectrolyte—micelle complexes

Sudbeck, Elise A.; Dubin, Paul L.; Curran, Mary; Skelton, John

doi:10.1016/0021-9797(91)90081-i

Cited by 60 publications

(42 citation statements)

References 24 publications

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“…For instance, they catalyze some reactions, act as solubilizers for water insoluble dyes, break down dye aggregates in order to accelerate adsorption processes on fibers, are auxiliaries for improving dye adsorption and are used as leveling agents [1][2][3][4]. Gemini or dimeric surfactants are rather novel surfactants that have become of considerable interest in the academic and industrial areas.…”

Section: Introductionmentioning

confidence: 99%

Aggregation and Thermodynamic Properties of Some Cationic Gemini Surfactants

Akbaş

Elemenli

Boz

2011

J Surfact & Detergents

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In this study, the gemini surfactants of the alkanediyl-a-x-bis(alkyl dimethyl ammonium) dibromide type, on the one hand, with different alkyl groups containing m carbon atoms and an ethanediyl spacer, referred to as ''m-2-m'' (m = 10, 12 and 16) and, on the other hand, with n-C 16 alkyl groups and different spacers containing s carbon atoms, referred to as ''16-s-16'' (s = 2, 6, 10 and Ar (8)) have been synthesized, purified and characterized. The critical micelle concentration (CMC), micelle ionization degree (a) and Gibbs free energy of micellization (DG mic ) of these surfactants and the monomeric cationic surfactants DTAB and CTAB have been determined by means of electric conductivity measurements. In addition, the temperature dependence of the CMC was determined for the 10-2-10 gemini surfactant. The CMCs of the gemini surfactants are found to be much lower than those of the corresponding monomeric surfactants and the effect of the hydrophobic alkyl chain length is more important than that of the spacer. The CMC of 16-s-16 passes through a maximum of (or around) s = 6 and then decreases for s = 10. The presence of a maximum CMC is explained by the contribution of a change of conformation of the surfactant with increasing spacer chain length. The changes of a with s and m are found qualitatively similar to those found for CMC values. The values of DG mic are more negative for the dimers than for the monomers and also change with an increasing spacer carbon number, as CMC values do. The thermodynamic parameters of micellization indicate that the micellization of 10-2-10 is enthalpy driven.

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Section: Introductionmentioning

confidence: 99%

Aggregation and Thermodynamic Properties of Some Cationic Gemini Surfactants

Akbaş

Elemenli

Boz

2011

J Surfact & Detergents

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“…Many experimental approaches have been used to study polymer -surfactant interactions such as turbidimetry [21,23], light scattering [26 -30], small-angle neutron scattering [35], electrophoretic light scattering [36,37], NMR [38], dialysis [26,39,40], surface tension [41 -44], viscometry [28,41], calorimetry [45], dye-solubilization [46,47], and solvatochromic studies [48], but relatively few techniques can be utilized to identify the phase transition and to clarify the dynamics of polyelectrolyte -micelle association. Static [28,30,49] and quasielastic [25,[27][28][29]49] light scattering especially have provided important information on the size and structure of polymermicelle complexes but soluble complexes can only be detected by QELS if their lifetime (residence time) is sufficiently long and the scattering intensity of the complexes is sufficiently large compared with those of the micelles and polymers from which they form.…”

Section: Introductionmentioning

confidence: 99%

Interactions of micelles with fluorescence-labeled polyelectrolytes

Morishima

Mizusaki

Yoshida

et al. 1999

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Pyrene-labeled polyelectrolytes can be used to study the interaction between the polyelectrolyte and an oppositely charged micelle, if the micelle incorporates a fluorescence quencher. If the charge on the micelle is varied systematically, polymer-micelle complex formation can be observed at some well-defined micelle surface charge density. Applying a kinetic model to steady-state and time-dependent fluorescence quenching data, one can estimate the binding constant (K), association rate constant, and lifetime (residence time). K increases strongly with increase in micelle surface charge density (|) or decrease in ionic strength (v). These effects arise from the dependence of association rate constant and residence time on | and v. While these observations reflect the fundamental electrostatic nature of the interaction, it is also found that micelles preferentially bind to pyrene sites, so that complex formation results from the conjoint action of electrostatic and hydrophobic forces.

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“…In practical applications, the mixtures of surfactant are often used because they are usually more effective than a single surfactant. On the other hand, some effects that are not expected in single systems can take place in aqueous solution containing mixed surfactants [1][2][3][4][5]. The performance superiority exhibited by the mixtures of surfactant is attributed to the synergistic or to the antagonistic interaction, depending on the properties of surfactant [6,7].…”

Section: Introductionmentioning

confidence: 93%

The Viscous Properties of Anionic/Cationic and Cationic/Nonionic Mixed Surfactant Systems

Akbaş

Sidim

2005

Colloid J

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The behavior of mixed cationic/anionic and cationic/nonionic surfactants solutions have been studied by viscosimetry. The systems studied were sodium dodecyl sulfate (SDS)/cetyltrimethylammonium bromide (CTAB) and CTAB/Brij (polyoxyethylene lauryl ether, n = 10 and 23) in aqueous and sodium chloride solutions. The relative viscosity of single nonionic surfactant solutions is larger than that of SDS or CTAB solutions. It increases with the number of ethylene oxide groups. In the mixed systems, viscosity deviates from ideal behavior. The deviation results from electrostatic interactions. The surfactant mixture composition affects the self-assembled microstructure and rheology. A new mixed system that forms clear micellar solution above CMC was detected. In CTAB/Brij systems, the experimental data also deviate from ideal behavior due to mixed micelle formation and electroviscous effect. This effect is less pronounced than that of SDS/CTAB system and could be suppressed by adding an electrolyte (NaCl). ş 1 The text was submitted by the authors in English.

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Dye solubilization in polyelectrolyte—micelle complexes

Cited by 60 publications

References 24 publications

Aggregation and Thermodynamic Properties of Some Cationic Gemini Surfactants

Aggregation and Thermodynamic Properties of Some Cationic Gemini Surfactants

Interactions of micelles with fluorescence-labeled polyelectrolytes

The Viscous Properties of Anionic/Cationic and Cationic/Nonionic Mixed Surfactant Systems

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