The DODAB–AOT–water system: vesicle formation and interactions with salts or synthetic polyelectrolytes

Pucci, Carlotta; Salvia, Anna Maria; Ortore, María Grazia; Mesa, Camillo La

doi:10.1039/c3sm51624e

Cited by 6 publications

(8 citation statements)

References 47 publications

(52 reference statements)

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“…Observed synergism was not surprising considering that molecular interactions between cationic and anionic surfactants are generally dominated by the electrostatic forces. Numerous surface adsorption studies showed that catanionic mixtures, due to attractive interactions between oppositely charged headgroups, are characterized with pronounced synergism and solution behavior that considerably deviates from ideal mixing compared to other types of surfactant mixtures. ,, …”

Section: Resultsmentioning

confidence: 99%

“…Numerous surface adsorption studies showed that catanionic mixtures, due to attractive interactions between oppositely charged headgroups, are characterized with pronounced synergism and solution behavior that considerably deviates from ideal mixing compared to other types of surfactant mixtures. 3,16,26 The composition of the adsorbed mixed monolayer (X [C 12 mim]Br ), the monolayer interaction parameter (β mon ), and the excess enthalpy of mixing (ΔH mix o ) were calculated by applying the regular solution theory (Table SI1, for details see Supporting Information). The calculated average value for β mon , which describes the nature and the strength of the interactions between two surfactants in the mixed monolayer, equals −21.…”

Section: Methodsmentioning

confidence: 99%

“…Due to their specific properties mixtures containing imidazolium based IL and/or AOT were the subject of a number of papers, ,− but the [C 12 mim]Br/AOT system has not been investigated previously. Additionally, despite numerous papers dealing with SAIL/surfactant interactions, very few provide a complete picture of the systems’ phase behavior.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Interplay of Noncovalent Interactions in Ionic Liquid/Sodium Bis(2-ethylhexyl) Sulfosuccinate Mixtures: From Lamellar to Bicontinuous Cubic Liquid Crystalline Phase

et al. 2016

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Phase transitions in mixtures of imidazolium based ionic liquid ([Cmim]Br) and anionic double tail surfactant, sodium bis(2-ethylhexyl) sulfosuccinate (AOT), were studied using a multitechnique approach. The system was primarily chosen for its expected ability to form a variety of lamellar and nonlamellar liquid crystalline phases which can transform into each other via different mechanisms. Depending on the bulk composition and total surfactant concentration, mixed micelles, coacervates, and lamellar and inverse bicontinuous cubic liquid crystalline phase were observed. Along with electrostatic attractions and geometric packing constraints, additional noncovalent interactions (hydrogen bonding, π-π stacking) enhanced attractive interactions and stabilized low curvature aggregates. At stoichiometric conditions, coexistence of coacervates and vesicles was found at lower, while bicontinuous cubic phase and vesicles were present at higher total surfactant concentrations. The phase transitions from a dispersed lamellar to inverse cubic bicontinuous phase occur as a consequence of charge shielding and closer packing of oppositely charged headgroups followed by a change in bilayer curvature. Transition is continuous with both phases coexisting over a relatively broad range of concentrations and very likely involves a sponge-like phase as a structural intermediate. To the best of our knowledge, this type of phase transition has not been observed before in surface active ionic liquid/surfactant mixtures.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interplay of Noncovalent Interactions in Ionic Liquid/Sodium Bis(2-ethylhexyl) Sulfosuccinate Mixtures: From Lamellar to Bicontinuous Cubic Liquid Crystalline Phase

et al. 2016

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“…The same happens when the polyelectrolyte in excess is adsorbed onto vesicles. 14,59 In this way, there are strong electrostatic repulsions between particles and the system is stable. The achievement of the nal state for both procedures (1 and 2) is slow since the nucleation process leading to the formation of a lamellar phase can be long.…”

Section: Effect Of Saltmentioning

confidence: 99%

Characterization and stability of catanionic vesicles formed by pseudo-tetraalkyl surfactant mixtures

2014

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The phase behavior of an ad hoc synthesized surfactant, sodium 8-hexadecylsulfate (8-SHS), and its mixtures with didecyldimethylammonium bromide (DiDAB) in water is reported. We dealt with dilute concentration regimes, at a total surfactant content of <30 mmol kg(-1) where vesicular aggregates may be formed. The high synergistic behavior of such catanionic mixtures is concomitant with strongly negative interaction parameters, β (≈-18 kBT), significant gain in the free energy of association, ΔGagg, and much lower association concentration compared to the pure surfactants. Vesicle size and ζ-potential depend on the mixture composition. Hydrodynamic diameters increase by progressive addition of oppositely charged surfactants to the one in excess. Counter-intuitively, the ζ-potential becomes more negative at DiDAB molar fractions close to 0.2. The same holds in the reverse case, the ζ-potential becomes more positive after small additions of 8-SHS; anyhow, the effect is more significant in anionic-rich mixtures. This phenomenon was explained by assuming a significant release of counterions and an asymmetric distribution of the two surfactants in the inner and outer vesicle leaflets. The equimolar mixtures form a cubic phase rather than the expected lamellar one. The effect of NaBr concentration on the stability of catanionic vesicles was also investigated. At high NaBr concentrations, all systems are destabilized. For DiDAB-rich vesicles, flocculation is observed, while for 8-SHS-rich ones, lamellar domains are formed at the bottom of the samples. The role played by NaBr depends on whether it is added before or after mixing the surfactants. In particular, preformed catanionic vesicles show a great kinetic stability towards addition of NaBr compared to those obtained by other procedures.

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“…Vesicles have attracted an increasing interest due to their potential application as carriers for active ingredients and controlled release systems [1][2][3][4][5]. In water, vesicle structures result from self-assembly of amphiphilic molecules above the gel-to-liquid crystalline phase transition temperature [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polymer-vesicle latex particles through an ATRP-based approach

Loiko¹,

Heuts

Herk

2022

Colloid Polym Sci

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The synthesis of polymer-vesicle latex particles by using extruded vesicles of dimethyldioctadecyl ammonium bromide (DODAB) via an atom transfer radical polymerization–based approach is reported. Cryo-TEM characterization revealed the growth of polymer from one side of the vesicle, and the final morphology of the resulting particles was affected by monomer feed composition. Protrusions or nanocapsules were synthesized when MMA:BA:EGDMA or MMA were used, respectively. Furthermore, it was found that the co-oligomer composition and chain length affect the resulting morphologies of the particles. Graphical abstract

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The DODAB–AOT–water system: vesicle formation and interactions with salts or synthetic polyelectrolytes

Cited by 6 publications

References 47 publications

Interplay of Noncovalent Interactions in Ionic Liquid/Sodium Bis(2-ethylhexyl) Sulfosuccinate Mixtures: From Lamellar to Bicontinuous Cubic Liquid Crystalline Phase

Interplay of Noncovalent Interactions in Ionic Liquid/Sodium Bis(2-ethylhexyl) Sulfosuccinate Mixtures: From Lamellar to Bicontinuous Cubic Liquid Crystalline Phase

Characterization and stability of catanionic vesicles formed by pseudo-tetraalkyl surfactant mixtures

Synthesis of polymer-vesicle latex particles through an ATRP-based approach

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