http://www.cnr.it/ontology/cnr/individuo/prodotto/ID201828

Aggregation processes in micellar solutions: A Raman study (Articolo in rivista)

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Aggregation processes in micellar solutions: A Raman study (Articolo in rivista) (literal)

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G. Cazzolli,a* S. Caponi,b A. Defant,a C. M. C. Gambi,c S. Marchetti,c M. Mattarelli,a M. Montagna,a B. Rossi,a F. Rossia and G. Viliani (2012)
Aggregation processes in micellar solutions: A Raman study
in Journal of Raman spectroscopy; WILEY-BLACKWELL, 111 RIVER ST, HOBOKEN 07030-5774, NJ (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

G. Cazzolli,a* S. Caponi,b A. Defant,a C. M. C. Gambi,c S. Marchetti,c M. Mattarelli,a M. Montagna,a B. Rossi,a F. Rossia and G. Viliani (literal)

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http://onlinelibrary.wiley.com/doi/10.1002/jrs.4120/abstract;jsessionid=71F030F4AC1E8E68BE0F5D7D79375E35.d01t02 (literal)

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* Correspondence to: G. Cazzolli, Dipartimento di fisica, Università di Trento, via Sommarive 14, I-38123, Povo, Trento, Italy. E-mail: cazzolli@science.unitn.it + Deceased a Dipartimento di fisica, Università di Trento, via Sommarive 14, I-38123, Povo, Trento, Italy b Istituto di Biofisica, Consiglio Nazionale delle Ricerche, via alla Cascata 56/C, I-38123 Trento, Italy c Dipartimento di fisica, Università di Firenze and CNISM, via G. Sansone, I-50019, Sesto Fiorentino, Firenze, Italy (literal)

Titolo

Abstract

Ionic surfactants such as sodium dodecyl sulfate (SDS) belong to the amphiphile family: they possess a long hydrophobic hydrocarbon chain and a polar hydrophilic headgroup. In a polar solvent and over the critical micellar concentration these molecules join to form micelles. The micellar solutions, in turn, if doped with various ligands tend to aggregate. Solid SDS, micelles of SDS in water and micelles of SDS doped with two types of macrocyclic ligands, Kryptofix 2.2.2 (K222) and crown ether 18-Crown-6 (18C6), at different concentrations are studied by Raman scattering, that represents a new approach to such systems. The experimental Raman spectrum, obtained on crystalline powders of SDS, is compared with the ab initio computed spectrum in order to assign the vibrational bands. After discriminating sensitive peaks by comparing the crystalline powders of the single components and their water solutions, the aggregation process and the action of the ligands are analyzed following the evolution of the intensity and wavenumber of these characteristic Raman peaks. This shows that Raman spectroscopy is sensitive to the aggregation dynamics and to the effects induced by the hydration layer on the molecules in solutions. A saturation effect in the aggregation process with the increase of the ligand concentration is observed. (literal)

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