Determination of Critical Micelle Concentration of Anionic Surfactants: Comparison of Internal and External Fluorescent Probes

Goon, Piyali; Manohar, C.; Kumar, Vinod

doi:10.1006/jcis.1997.4804

Cited by 35 publications

(30 citation statements)

References 13 publications

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“…The compositions of each system are summarized in Table 1. The concentration of the surfactants in all the aqueous dispersion systems were much higher than their critical micelle concentrations (Goon et al, 1997;Rodoríguez-Cruz et al, 2005;Sánchez-Martín et al, 2008). The allophane, 1.0 g, was suspended in these aqueous dispersion systems as well as the aqueous solutions, 30 cm 3 , of LAS (1.0  10 −2 −1.0  10 −1 mol dm −3 ) and linoleic acid (1.0  10 −3 mol dm −3 ).…”

Section: Measurementsmentioning

confidence: 99%

Removal of detergents and fats from waste water using allophane

Nishikiori¹,

Kobayashi²,

Kubota³

et al. 2010

Applied Clay Science

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Micelles, consisting of an anionic surfactant and a fatty acid released from a fat, were removed from an aqueous phase using the ion exchange characteristics of a natural clay mineral, allophane. The UV spectral measurements revealed that the concentrations of the anionic surfactant and the fatty acid in the aqueous phase decreased and that these species were removed from the aqueous phase. The adsorption of the surfactant and the fatty acid onto the allophane was confirmed by FT-IR spectroscopy. Furthermore, this adsorption was confirmed by the adsorption of anthracene added as a probe molecule.

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Section: Measurementsmentioning

confidence: 99%

Removal of detergents and fats from waste water using allophane

Nishikiori¹,

Kobayashi²,

Kubota³

et al. 2010

Applied Clay Science

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“…In recent years, aggregation behavior of NaLAS has been extensively studied (1)(2)(3)(4)(5)(6). Spectroscopic studies done in our laboratory on these classes of surfactants indicated some interesting aggregation-induced conformational changes.…”

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confidence: 98%

Detergency and foam studies on linear alkylbenzene sulfonate and secondary alkyl sulfonate

Goon¹,

Bhirud

Kumar³

1999

J Surfact & Detergents

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Among anionic surfactants used in detergent products, the sodium salt of linear alkylbenzene sulfonate (NaLAS) is the only surfactant belonging to the aromatic class; the others are aliphatic, e.g., the sodium salt of secondary alkyl sulfonate (NaSAS). We observed earlier that certain conformational changes taking place in aromatic anionic surfactants (NaLAS) upon micellization can be brought about in aliphatic anionic surfactants (NaSAS) by addition of phenol. In this paper we examined how conformational changes at the molecular level translated into macroscopic properties such as foam and detergency. We performed foam and detergency measurements on NaLAS, NaSAS, and NaSAS/phenol systems. Foam behavior of these systems is shown to be dependent only upon calcium ion sensitivities of the surfactants whereas the detergency results have a dependence on conformational changes at the molecular level.Among anionic surfactants used in detergent products, the sodium salt of linear alkylbenzene sulfonate (NaLAS) is the only aromatic one; the others are aliphatic. In recent years, aggregation behavior of NaLAS has been extensively studied (1-6). Spectroscopic studies done in our laboratory on these classes of surfactants indicated some interesting aggregation-induced conformational changes. Specifically, in the case of NaLAS, the proton nuclear magnetic resonance (NMR) peaks corresponding to terminal methyl groups of the hydrocarbon chains appeared as a composite triplet below the critical micelle concentration (CMC). However, upon micellization, two well-defined triplets corresponding to each of the terminal methyl groups were observed. Based on these results, it was concluded that in NaLAS micelles, the shorter alkyl chain loops toward the palisade layer and experiences the phenyl ring effect (7). These conformational changes were not observed in the case of nonaromatic surfactants, specifically the sodium salt of secondary alkyl sulfonates/sulfates (NaSAS). However, the conformational changes encountered in NaLAS were brought about in NaSAS by the external incorporation of a phenyl ring by the addition of phenol (8). These phenomena indicate that the aggregation-induced conformation changes caused by the aromatic ring in NaLAS can be mimicked in the aliphatic anionic surfactant NaSAS by introducing a phenyl group externally.The objective of this paper was to examine how conformational changes observed at the molecular level translated into macroscopic properties. In view of this, the foam and detergency behavior of NaLAS, NaSAS, and NaSAS/phenol systems was studied. MATERIALS AND METHODSA sample of the sodium salt of LAS was prepared in the laboratory by neutralizing commercial linear alkylbenzene sulfonic acid (Reliance Industries, Mumbai, India) with sodium hydroxide solution in a Z-blade (Sigma) mixer. The resulting paste of NaLAS was dried in an oven at about 60°C, followed by vacuum drying. This dried NaLAS was subjected to Soxhlet solvent extraction using hexane to remove nondetergent organic matter. The paste was...

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“…There were two contradictory factors: the exclusion between polar heads impeded micel lization, while interaction between surfactant and SC-CO 2 promoted micellization. These two phenomena were all affected by temperature [7]. Specifically, as an anionic surfactant, the repulsion forces between ion heads of AOT always performed dominating effects on micelle formation, thus w CM of the surfactant increased with increased temperature.…”

Section: Critical Micelle Concentration Of Surfactant In Sc-comentioning

confidence: 95%

Formation of reverse micelles in supercritical carbon dioxide and its thermodynamics

Wen

Dang

Zhu

et al. 2007

Front. Chem. Eng. China

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The solubilization behavior of methyl orange as a solvation probe in multiple systems composed of supercritical carbon dioxide, surfactants and co-solvents, is studied. It is concluded that some surfactants, such as sodium bis-(2-ethylhexyl) sulfosuccinate (AOT) and isooctyl phenol polyethoxylate (TX-10), could form reverse micelles in supercritical carbon dioxide under the action of butanol. The formation of reverse micelles is a spontaneous process thermodynamically. Specifically for the nonionic surfactant TX-10, the formation of reverse micelles is dependent on the entropy increase in the system, while for the anionic surfactant AOT, the micellization is mainly dominated by the increase in enthalpy at higher temperatures, but by the increase in entropy at lower temperatures.

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Determination of Critical Micelle Concentration of Anionic Surfactants: Comparison of Internal and External Fluorescent Probes

Cited by 35 publications

References 13 publications

Removal of detergents and fats from waste water using allophane

Removal of detergents and fats from waste water using allophane

Detergency and foam studies on linear alkylbenzene sulfonate and secondary alkyl sulfonate

Formation of reverse micelles in supercritical carbon dioxide and its thermodynamics

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