Interfacial Behavior of Catanionic Surfactants

Stocco, Antonio; Carriere, David; Cottat, Maximilien; Langévin, D.

doi:10.1021/la100954v

Cited by 83 publications

(62 citation statements)

References 39 publications

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“…25 Here, the water/oil interfacial tension as a function of time is deduced from the capillary pressure of a water droplet in oil for two different compositions (Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

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Pickering emulsions stabilized by stacked catanionic micro-crystals controlled by charge regulation

et al. 2011

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In this paper the mechanism behind the stabilization of Pickering emulsions by stacked catanionic micro-crystals is described. A temperature-quench of mixtures of oppositely charged surfactants (catanionics) and tetradecane from above the chain melting temperature to room temperature produces stable oil-in-water (o/w) Pickering emulsions in the absence of Ostwald ripening. The oil droplets are decorated by stacks of crystalline discs. The stacking of these discs is controlled by charge regulation as derived from conductivity, scattering and zeta potential measurements. Catanionic nanodiscs are ideal solid particles to stabilize Pickering emulsions since they present no density difference and a structural surface charge which is controlled by the molar ratio between anionic and cationic components. The contact angle of catanionic nanodiscs at a water/oil interface is also controlled by the nonstoichiometry of the components. The resulting energy of adhesion and the repulsion between droplets is much larger than kT. As a consequence of these unique properties of nanodiscs, this type of emulsions presents an extremely high resistance towards coalescence and creaming, even in the presence of salt.

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“…25 Here, the water/oil interfacial tension as a function of time is deduced from the capillary pressure of a water droplet in oil for two different compositions (Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…25 Thus, we estimated the surface energies s i for catanionics from the equilibrium surface tensions g i 25 by applying Connor's equation: [30][31][32] …”

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confidence: 99%

Pickering emulsions stabilized by stacked catanionic micro-crystals controlled by charge regulation

et al. 2011

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“…On the other hand, some effects that are not expected in single surfactant systems can take place in aqueous solution containing mixed surfactants [1][2][3][4][5]. The performance superiority exhibited by the mixtures of surfactants is attributed to the synergistic or to the antagonistic interaction, depending on the properties of the surfactants [6][7][8][9][10][11][12]. Decreased critical micelle concentration (CMC), high interfacial activity, altered micellar morphology as compared to unmixed surfactant alone, reduce the total amount of surfactant and hence the cost and environmental impact [13,14].…”

Section: Introductionmentioning

confidence: 99%

Interaction Between Nonionic and Gemini (Cationic) Surfactants: Effect of Spacer Chain Length

Chavda

Bahadur

Aswal³

2011

J Surfact & Detergents

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The interaction between mixtures of nonionic surfactant polyethylene glycol p-(1,1,3,3-tetramethyl butyl)-phenyl ether and cationic gemini surfactants alkanediyl-a,x-bis(dimethyldodecylammonium bromide) (12-s-12, where s = 2, 4 and 6) was studied using surface tension and small-angle neutron scattering measurements. Marked interaction was observed for the investigated surfactants mixtures which depend upon the hydrophobic spacer length of the gemini surfactant and also on the fraction of nonionic surfactant in the mixed systems. The results are discussed in terms of interaction parameters calculated according to the theory of regular solutions which uses the critical micelle concentration determined tensiometrically to calculate the molecular interaction parameter and the mole fractions of the two components in the mixed micelles. A relatively high negative molecular interaction parameter value (up to -3.40) obtained for mixtures of nonionic and cationic gemini surfactant indicates a presence of strong attractive interaction in the mixed system that increases with the spacer length of the gemini surfactant. Micellar parameters deduced from small-angle neutron scattering measurements also compliment the surface tension results.

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“…High values of surface viscoelasticity can potentially lead to the suppression of marginal regeneration and a reduced rate of foam film drainage [24][25][26] and coalescence [3,12] therefore, a good correlation between the liquid film or foam stability and the surface viscoelasticity has been found [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. If the enhanced viscoelasticity is developed on airwater interface during foam generation (at surface ages < 1s), foamability can also be enhanced.…”

Section: Surface Viscoelasticitymentioning

confidence: 99%

Foamability of sodium dodecyl sulfate solutions: Anomalous effect of dodecanol unexplained by conventional theories

Wang

Nguyen

Farrokhpay

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. • Antifoam efficacy of DOH and decreased bubble surface potential explain the decreased foamability of pre-CMC SDS-DOH solutions.• Complex effect of surfactant mixtures on foamability is demonstrated.4 AbstractConventional theories indicate that surfactant solutions with low surface tension, fast adsorption kinetics, and high interfacial viscoelasticity increase foamability. These theories are applicable to single surfactants of pre-CMC. Here, we examine whether these theories are applicable for surfactant mixtures. Specifically, we investigated the foamability of sodium dodecyl sulfate (SDS)-dodecanol (DOH) solutions. We found that the foamability of SDS-DOH solutions exhibited 'anomalies' that were unexplained by conventional theories. The remarkable decrease in the foamability of SDS solutions caused by the addition of DOH could not be easily explained by the theories of surface tension and surface viscoelasticity.Instead, we proposed alternative mechanisms to resolve these unexpected results. Below the DOH solubility limit, the replacement of SDS molecules by DOH molecules at the air-water interface results in a reduced surface potential, leading to a lower foamability. The antifoam effects of DOH droplets can account for the reduced foamability above this limit. This paper highlights the complex effect of surfactant mixtures on foamability.

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Interfacial Behavior of Catanionic Surfactants

Cited by 83 publications

References 39 publications

Pickering emulsions stabilized by stacked catanionic micro-crystals controlled by charge regulation

Pickering emulsions stabilized by stacked catanionic micro-crystals controlled by charge regulation

Interaction Between Nonionic and Gemini (Cationic) Surfactants: Effect of Spacer Chain Length

Foamability of sodium dodecyl sulfate solutions: Anomalous effect of dodecanol unexplained by conventional theories

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