Critical micelle concentrations of aqueous surfactant systems

Mukerjee, Pasupati; Mysels, Karol J.

doi:10.6028/nbs.nsrds.36

Cited by 1,402 publications

(1,143 citation statements)

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“…No significant effects of headgroups were observed, and surfactants with sulfate 24 5.0 × 10 -1 1.5 × 10 -1 2.1 × 10 -2 9.8 × 10 -3 1.9 × 10 -3 6.1 × 10 -4 ((9.1 × 10 -3 ) ((2.0 × 10 -4 ) ((2.0 × 10 -4 ) ((9.0 × 10 -5 ) emission intensity 4.8 × 10 -1 9.7 × 10 -1 3.2 × 10 -2 7.9 × 10 -3 1.1 × 10 -3 2.3 × 10 -4 emission wavelength 3.7 × 10 -1 1.2 × 10 -1 4.0 × 10 -3 4.3 × 10 -3 3.0 × 10 -4 2.0 × 10 -4 ((5.8 × 10 -2 ) ((1.1 × 10 -2 ) ((1.4 × 10 -4 ) ((2.1 × 10 -4 ) ((6.2 × 10 -5 ) ((9.8 × 10 -6 ) specific conductivity 3.3 × 10 -2 1.2 × 10 -2 2.2 × 10 -3 7.6 × 10 -4 ((3.3 × 10 -4 ) ((2.0 × 10 -5 ) ((4.0 × 10 -5 ) ((6.5 × 10 -5 ) and sulfonate groups have both been used in the subsequent experiments to obtain the best experimental conditions.…”

Section: Resultsmentioning

confidence: 92%

Modulating the Emission Intensity of Poly-(9,9-bis(6‘-N,N,N-trimethylammonium)hexyl)-Fluorene Phenylene) Bromide Through Interaction with Sodium Alkylsulfonate Surfactants

et al. 2007

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The interaction between the cationic HTMA-PFP (Poly-(9,9-bis(6′-N,N,N-trimethylammonium)hexyl-fluorene phenylene) bromide) and oppositely charged sodium n-alkyl sulfonate surfactants of different chain lengths has been studied in DMSO-water solutions (4% v/v) by UV-visible absorption, fluorescence spectroscopy, fluorescence lifetimes, electrical conductivity, and 1 H NMR spectroscopy. Polymer-surfactant interactions lead to complex spectroscopic behaviors which depends on surfactant concentration. At low surfactant concentrations, the observed strong static fluorescence quenching of fluorescence seems to be associated with formation of aggregates between polymer chains neutralized through interaction with surfactants. This is supported by conductivity and by analysis of absorption spectra deconvoluted at each surfactant concentration using an adapted iterative method. In contrast, above the surfactant critical micelle concentration, there is a strong fluorescence enhancement, leading in some cases to higher intensities than in the absence of surfactants. This is attributed to the transformation of the initially formed aggregates into some new aggregate species involving surfactant and polymer. These changes in HTMA-PFP fluorescence as a function of n-alkyl sulfonate concentration are important for the general understanding of polymer-surfactant interactions, and the aggregates formed may be important as novel systems for applications of these conjugated polyelectrolytes.

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Section: Resultsmentioning

confidence: 92%

Modulating the Emission Intensity of Poly-(9,9-bis(6‘-N,N,N-trimethylammonium)hexyl)-Fluorene Phenylene) Bromide Through Interaction with Sodium Alkylsulfonate Surfactants

et al. 2007

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“…The concentration of SLS used in this study was well above the CMC, which is ca. 0.23% (m/v) (Mukerjee & Mysels 1971). The polar region of the surfactant is strongly attracted to water due to charge interactions, which maintains a favorable energy balance in the system, at equilibrium, when solute is present in the solvent at relatively high concentrations.…”

Section: Discussionmentioning

confidence: 99%

Effect of vehicles and sodium lauryl sulphate on xenobiotic permeability and stratum corneum partitioning in porcine skin

Merwe

Riviere

2005

Toxicology

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Dermal contact with potentially toxic agricultural and industrial chemicals is a common hazard encountered in occupational, accidental spill and environmental contamination scenarios. Different solvents and chemical mixtures may influence dermal absorption. The effects of sodium lauryl sulphate (SLS) on the stratum corneum partitioning and permeability in porcine skin of 10 agricultural and industrial chemicals in water, ethanol and propylene glycol were investigated. The chemicals were phenol, p-nitrophenol, pentachlorophenol, methyl parathion, ethyl parathion, chlorpyrifos, fenthion, simazine, atrazine and propazine. SLS decreased partitioning into stratum corneum from water for lipophilic compounds, decreased partitioning from propylene glycol and did not alter partitioning from ethanol. SLS effects on permeability were less consistent, but generally decreased permeability from water, increased permeability from ethanol and had an inconsistent effect on permeability from propylene glycol. It was concluded that, for the compounds tested, partitioning into the stratum corneum was determined by the relative solubility of the solute in the donor solvent and the stratum corneum lipids.Permeability, however, reflected the result of successive, complex processes and was not predictable from stratum corneum partitioning alone. Addition of SLS to solvents altered partitioning and absorption characteristics across a range of compounds, which indicates that partition coefficients or skin permeability from neat chemical exposure should be used with caution in risk assessment procedures for chemical mixtures.

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“…9), the platinum salt and CTAB are dissolved in the aqueous solution. CTAB probably forms micellar species since its concentration in solution (around 5 mM in the final solution) is higher than the Critical Micellar Concentration (0.8-1.1 mM) [37]. When the aged H 2 PtCl 6 solution is added, the Pt 4+ cation could be surrounded by different coordination shells since the ageing of the solution is supposed to lead to the partial or complete substitution of chloride ligands by hydroxides ones [21,22,38]: (1), an interaction between CTAB and the platinate salt could be envisaged.…”

Section: Proposition Of a Mechanism For Platinum Nanoparticles Formationmentioning

confidence: 99%

Nanostructured Heterogeneous Catalysts: Well Defined Platinum Nanoparticles Supported on Alumina. Preparation, Characterization and Application to the Selective Hydrogenation of Buta-1,3-diene

Minh

Oudart

Baubet

et al. 2009

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Catalyseurs hétérogènes nanostructurés : nanoparticules de platine de morphologies définies supportées sur alumine. Préparation, caractérisation et application en hydrogénation sélective du buta-1,3-diène -Des nanoparticules de platine possédant des morphologies particulières ont été préparées en solution aqueuse. Des paramètres clefs, tels que le ratio entre le tensioactif (bromure de cetyltrimethylammonium, CTAB) et le précurseur de platine (H 2 PtCl 6 ), la température, l'atmosphère (argon ou hydrogène), doivent être maîtrisés pour contrôler la formation des particules de platine nanostructurées et leurs morphologies. Des nanoparticules de platine se présentant soit sous la forme de cubes, soit sous la forme d'un mélange de formes (bâtonnets, cubes, tétraèdres), soit sous la forme de polyèdres ont ainsi été obtenues selon le ratio CTAB/Pt utilisé, l'atmosphère et la température. Un mécanisme de formation de ces nanoparticules de platine est proposé. Les nanoparticules de platine ont ensuite été déposées sur alumine et leurs propriétés catalytiques évaluées dans la réaction d'hydrogénation sélective du buta-1,3-diene. Les catalyseurs préparés avec des nanoparticules de platine se présentant sous la forme de polyèdres, qui exposent préférentiellement les plans cristallographiques (111), sont les plus sélectifs pour l'hydrogénation du buta-1,3-diene en butènes, avec une diminution considérable de l'hydrogénation complète vers les butanes. Abstract -Nanostructured Heterogeneous Catalysts: Well Defined Platinum Nanoparticles Supported on Alumina. Preparation, Characterization and Application to the Selective Hydrogenation of Buta-1,3-diene -Platinum nanoparticles with specific morphologies were prepared in aqueous solution. Key parameters, such as cationic surfactant (cetyltrimethylammonium bromide CTAB) and platinum precursor (H 2 PtCl 6 ) ratio, temperature, atmosphere (argon or hydrogen), were required to control the formation of nanostructured platinum particles, with well defined morphologies, and even to control their morphology. Platinum nanoparticles with mainly cubic morphologies, with a mix of morphologies (rods, cubes, tetrahedra)

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Critical micelle concentrations of aqueous surfactant systems

Cited by 1,402 publications

References 34 publications

Modulating the Emission Intensity of Poly-(9,9-bis(6‘-N,N,N-trimethylammonium)hexyl)-Fluorene Phenylene) Bromide Through Interaction with Sodium Alkylsulfonate Surfactants

Modulating the Emission Intensity of Poly-(9,9-bis(6‘-N,N,N-trimethylammonium)hexyl)-Fluorene Phenylene) Bromide Through Interaction with Sodium Alkylsulfonate Surfactants

Effect of vehicles and sodium lauryl sulphate on xenobiotic permeability and stratum corneum partitioning in porcine skin

Nanostructured Heterogeneous Catalysts: Well Defined Platinum Nanoparticles Supported on Alumina. Preparation, Characterization and Application to the Selective Hydrogenation of Buta-1,3-diene

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