Gaudino, Danila (2016) Morphology and dynamics of ionic Cetylpyridinium Chloride-Sodium Salicylate micellar solutions. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: Morphology and dynamics of ionic Cetylpyridinium Chloride-Sodium Salicylate micellar solutions
Creators:
CreatorsEmail
Gaudino, Daniladanila.gaudino@unina.it
Date: 24 March 2016
Number of Pages: 129
Institution: Università degli Studi di Napoli Federico II
Department: Ingegneria Chimica, dei Materiali e della Produzione Industriale
Scuola di dottorato: Ingegneria industriale
Dottorato: Ingegneria chimica
Ciclo di dottorato: 28
Coordinatore del Corso di dottorato:
nomeemail
D'Anna, Andreaanddanna@unina.it
Tutor:
nomeemail
Grizzuti, NinoUNSPECIFIED
Date: 24 March 2016
Number of Pages: 129
Uncontrolled Keywords: Micelles; rheology; neutron scattering; dynamics; morphology; surfactants
Settori scientifico-disciplinari del MIUR: Area 09 - Ingegneria industriale e dell'informazione > ING-IND/24 - Principi di ingegneria chimica
Date Deposited: 11 Apr 2016 19:42
Last Modified: 16 Nov 2016 10:35
URI: http://www.fedoa.unina.it/id/eprint/10723

Abstract

Micellar solutions are made of amphiphilic molecules, with a hydrophilic head and a hydrophobic tail, dispersed in an aqueous medium. In order to minimize the contact between the hydrophobic part and the water, these molecules form different morphological structures, referred to as micelles, which are tied together through physico-chemical interactions. Depending on the micellar morphology, they show strong different dynamical responses. The possibility to easily change the structure they assume and, thus, their rheological properties, makes these systems suitable for a wide range of applications. However, although micellar solutions have been widely investigated for about thirty years, they still represent a challenge since a direct correlation between their microstructure and their macroscopic dynamics is still largely lacking. Hence, the aim of this work is to give a contribution in the morphological and dynamical analysis of such solutions. In particular, among all the wide variety of micellar scenarios, a specific ionic surfactant, the Cetylpyridinium Chloride, and a strong binding salt, the Sodium Salicylate, have been chosen as main characters of the model system selected for this PhD Thesis. In the first part of the work, the crucial role played by the binding salt in the determination of the micellar microstructures and their linear dynamics is highlighted through static scattering experiments and linear viscoelastic measurements. The second part of the thesis deals with the investigation of flow dynamics properties of micellar solutions characterized by different morphologies. In this analysis, in situ rheology-scattering experiments have been performed.

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