Micellar aggregation for ionic surfactant in pure solvent and electrolyte solution: Nonextensive thermodynamics approach

Letellier, Pierre; Mayaffre, Alain; Turmine, Mireille

doi:10.1016/j.jcis.2008.01.030

Cited by 16 publications

(18 citation statements)

References 83 publications

(93 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We can find another example of this feature of  considering the behavior of charged micelles [12]. In micellar solutions, the aggregates formed by the amphiphiles and their counter -ions can be treated as non-extensive interpenetrating phases.…”

Section: The Conceptual Bases Of Non-extensive Thermodynamics Notionmentioning

confidence: 99%

See 1 more Smart Citation

Displacement of voltammetric peaks with nanoparticles size: a nonextensive thermodynamic approach

Letellier

Turmine

2014

Electrochimica Acta

Self Cite

View full text Add to dashboard Cite

We show here that the concepts of nonextensive thermodynamics (NET), described previously (J. Phys. Chem. B, 2004, 108, 18980) and applied to redox behaviour of nanoparticles (J. Phys.Chem. C, 2008, 112, 12116) can be used to express by a power law the variations to the electrochemical kinetics of nanoparticles and in particular to voltammetry. We proposed here a generalization of Plieth's relationship for non-spherical aggregates by assuming that the interface between the particle and its environment is fuzzy. Thus, the relations of non-extensive thermodynamics can quantitatively account for the displacements of electro-oxidation potentials of metal nanoparticles deposited on electrodes, according to their measured size. Our approach also permits to formally justify the stability of the particles may increase as their size decreases, (τ < 0). This is usually found when the aggregates are in close contact with a matrix (in the case, for example, of embedded particles).

show abstract

Section: The Conceptual Bases Of Non-extensive Thermodynamics Notionmentioning

confidence: 99%

“…The interface between the particle and its environment is supposed to be fuzzy. The use of this approach to describe the reactivity of various interfacial systems [9][10][11][12], has been particularly fruitful.…”

Section: Introductionmentioning

confidence: 99%

Displacement of voltammetric peaks with nanoparticles size: a nonextensive thermodynamic approach

Letellier

Turmine

2014

Electrochimica Acta

Self Cite

View full text Add to dashboard Cite

show abstract

“…This operation was repeated several times for the same pH in order to check that the result did not depend on the quantity of surfactant introduced into the medium. In all these operations, the surfactant concentrations were close to the micelle critical threshold to avoid the effect of the quantity of aggregated surfactant on the activity of the constituents of the micelle [47].…”

Section: Determination Of the Ratio Of Ionizationmentioning

confidence: 99%

Acid–Base Equilibrium of Dodecyldimethyl‐Amine‐N‐Oxide Micelles in Water–Butanol Binary at 298 K

Bouguerra

Letellier²,

Turmine³

2009

J Surfact & Detergents

Self Cite

View full text Add to dashboard Cite

Dodecyldimethyl-amine-N-oxide (DDAO) is a zwitterionic surfactant that can be protonated in water to form DDAOH ? if the pH of the medium is appropriate. We proposed, in a previous study, an experimental approach to determine directly the ratio of ionization of the surfactant in the micelle and in the bulk, at a given acidity level, without the need of a presupposed model of protonic exchange. We also showed that the relations of Thermodynamics impose a relationship between the critical micelle concentration (cmc) and the level of protonation of DDAO in the micelle and in the bulk. In order to appreciate the general nature of our approach, we have now modified the protonic exchange equilibrium between DDAO and DDAOH ? by introducing butanol into the solution. We studied three mixed media (2, 4 and 6% alcohol by volume). For all these mixtures, we validated our experimental and theoretical approaches. Moreover, for all the hydroalcoholic mixtures considered and all pH values, the presence of butanol stabilizes the micelle leading to a decrease of the cmc. Similar to pure water (Lair et al. in Langmuir, 20:8490-8495, 2004), we showed that, in these media, the protonic exchange equilibrium between DDAOH ? and DDAO in their micellized forms cannot be characterized by an unique equilibrium constant independent of the pH. However, as the butanol content of the medium increases, the variations in apparent pK with pH decrease, indicating that the behaviour of the acid-base pair in the micelle is classical and corresponds to a stoichiometric proton exchange.

show abstract

“…The interfaces are supposed to be "fuzzy". We so treated the solubility of the small aggregates [17], their redox potential [18], their melting point [19], their surfactant properties in a solvent [20] or their wettabilities [21]. In these studies, we showed that, for non-extensive phases, the chemical potential, which is an intensive variable in the case of the unlimited phases, loses this property.…”

Section: Introductionmentioning

confidence: 99%

Solubility of gas in confined systems. Nonextensive thermodynamics approach

Letellier¹,

Turmine²

2013

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

The use of the concepts of the nonextensive thermodynamics allows reconsidering the equilibrium of bubble solubilization, and more commonly of gaseous aggregates in supersaturated solutions of gas. The introduced relations are general and include as particular cases the equations usually used to describe these phenomena. These equations are discussed.Especially, we specified the domain of application of Kelvin's relation which was illustrated by the solubility of gases in fogs and clouds. Various possibilities of thoughts on the behavior of the gaseous aggregates and nano-systems are proposed. Thus, the introduced relations permit to consider the presence of gaseous aggregates in equilibrium with the solution even for undersaturated solution. Non-extensive thermodynamics admits the notion of negative pressure at the inner of confined phases (solid or liquid).

show abstract

Micellar aggregation for ionic surfactant in pure solvent and electrolyte solution: Nonextensive thermodynamics approach

Cited by 16 publications

References 83 publications

Displacement of voltammetric peaks with nanoparticles size: a nonextensive thermodynamic approach

Displacement of voltammetric peaks with nanoparticles size: a nonextensive thermodynamic approach

Acid–Base Equilibrium of Dodecyldimethyl‐Amine‐N‐Oxide Micelles in Water–Butanol Binary at 298 K

Solubility of gas in confined systems. Nonextensive thermodynamics approach

Contact Info

Product

Resources

About