Mixing behaviour of charged and non-charged surfactants described by BET isotherms

Letellier, Pierre; Mayaffre, Alain; Turmine, Mireille

doi:10.1016/j.jcis.2009.05.009

Cited by 5 publications

(7 citation statements)

References 52 publications

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“…The BET model is generally used to account for the properties of concentrated aqueous salt mixtures. We proposed in a recent work to apply it to mixtures of charged and noncharged surfactants [35]. …”

Section: Resultsmentioning

confidence: 99%

Thoughts on the ideal behavior of mixed micelles and the appropriate application of regular solution theory (RST)

Letellier¹,

Mayaffre²,

Turmine³

2011

Journal of Colloid and Interface Science

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Solutions of mixed surfactants are often considered as solvent mixtures. Usually, mixed micellar aggregates are considered as a homogeneous mixture of solvents dispersed in a solution. But the transposition of the usual thermodynamic models of solvent mixtures to mixed micelles is not always so obvious. We discussed this point in this paper by considering several cases of surfactant mixtures. A major problem is to define the molar fraction of each surfactant in the aggregate especially when a charged surfactant is employed in the mixture, because possible dissociation of the components of the mixture must be considered in the bulk as well in the micelle. This definition is crucial especially for the characterization of the ideal behavior which is usually described by the Clint relation, as well as for the application of regular solution theory (RST) which is the most frequently applied model for interpreting the behavior of surfactant mixtures. We show in this paper how the definition of the molar fraction can change the equations and the interpretations.

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Section: Resultsmentioning

confidence: 99%

Thoughts on the ideal behavior of mixed micelles and the appropriate application of regular solution theory (RST)

Letellier¹,

Mayaffre²,

Turmine³

2011

Journal of Colloid and Interface Science

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“…They proposed a relation between the water activity and stoichiometric mole fraction of the salt, and introduced a constant related to the heat of adsorption of water (monomolecular layer solvation). Letellier et al [37] employed this modified BET model to study the mixing behavior of different surfactants beyond their aggregation threshold. This model describes the properties of mixed micelles of two pure surfactants in a wide composition range.…”

Section: Brunauer-emmett-teller Isothermmentioning

confidence: 99%

Insights into the S-shaped sorption isotherms and their dimensionless forms

Inglezakis

Poulopoulos

Kazemian

2018

Microporous and Mesoporous Materials

110

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Isotherms are of paramount importance for the interpretation of adsorption and ion exchange mechanisms, and the design of separation and catalytic processes. Although the literature on sorption isotherms is rich, most of experiments and models employed are limited to systems that obey simple equilibrium isotherms, such as linear, favorable or unfavorable types. This paper deals with the rather overlooked S-shaped isotherms and their dimensionless forms, which is of great importance for modeling of separation processes and interpretation of equilibrium data. A review on the physical significance and applications of S-shaped isotherms in adsorption and ion exchange process is also presented.

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“…Penfold et al (1995);Lu et al (2012)) and are summarized in SI -Section S8. While this approach has been criticized on theoretical thermodynamic grounds (Letellier et al, 2009;Letellier and Turmine, 2015) it remains a useful means of understanding and predicting surfactant mixture behavior (Lu et al, 2012;Liley et al, 2017). expected.…”

Section: A C C E P T E Dmentioning

confidence: 99%

Transport potential of super-hydrophobic organic contaminants in anionic-nonionic surfactant mixture micelles

et al. 2019

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Surfactant mixtures are commonly used in agricultural and soil remediation applications, necessitating an understanding of their micellization behaviour and associated impact on the fate of co-existing chemicals in the subsurface. A polymer-water sorption isotherm approach was shown to present an alternative to traditional methods for quantifying, understanding and predicting surfactant mixture properties. Micelle compositions were measured for anionic-nonionic surfactant mixtures. This is important since micelle composition can alter the apparent aqueous solubility of super-hydrophobic organic contaminants (SHOCs) resulting in surfactant facilitated transport (SFT). A key parameter in predicting SFT for SHOCs is their micelle-water partition constant (K MI ). These were determined for polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated biphenyls (PCBs) with representative anionic-nonionic surfactant mixtures using a polymer depletion method. These previously unreported constants were intermediate between those for pure anionic and nonionic surfactant solutions, with magnitude depending on micelle composition. Separate linear relationships were found between log K MI and log K OW for PCDDs and PCBs. This work provides new methods and preliminary results relating to binary surfactant mixtures (e.g. critical micelle concentration and micelle composition) and SHOCs (K MI ) that are important in the evaluation of the fate and transport of SHOCs in the subsurface environment and provide insight into the environmental mobility of these important contaminants.

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Mixing behaviour of charged and non-charged surfactants described by BET isotherms

Cited by 5 publications

References 52 publications

Thoughts on the ideal behavior of mixed micelles and the appropriate application of regular solution theory (RST)

Thoughts on the ideal behavior of mixed micelles and the appropriate application of regular solution theory (RST)

Insights into the S-shaped sorption isotherms and their dimensionless forms

Transport potential of super-hydrophobic organic contaminants in anionic-nonionic surfactant mixture micelles

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