Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/244358
Type: Artigo
Title: Calorimetric and light scattering investigations of the transition from spherical to wormlike micelles of C14TAB triggered by salicylate
Author: Ito, Thiago Heiji
Rodrigues, Roberta Kamei
Loh, Watson
Sabadini, Edvaldo
Abstract: Although wormlike micelles (WLM) were first described more than 30 years ago, many aspects of their formation process are still unclear. Herein, a systematic experimental investigation of the process for wormlike micelle (WLM) formation in mixtures of tetradecyltrimethylammonium bromide (C(14)TAB) and salicylate (2-hydroxybenzoate) was carried out. This system was used as a model to investigate the conditions for the formation of the giant aggregate. For comparison, the other two isomers of salicylate (3- and 4-hydroxybenzoate) were also investigated, once in these cases wormlike micelles are not formed. The studies were based on calorimetric titration, static light scattering, and rheological measurements. Enthalpy changes upon titration of C(14)TAB into 2-hydroxybenzoate solutions revealed a highly Cooperative and exothermic process that was associated with micelle growth. The size of the aggregates, obtained by static light scattering measurements, confirms the shape transition. In addition, the correlation of these two sets of results with measurements of micelle charge surface indicates that this transition occurs around the point of charge neutralization.
Although wormlike micelles (WLM) were first described more than 30 years ago, many aspects of their formation process are still unclear. Herein, a systematic experimental investigation of the process for wormlike micelle (WLM) formation in mixtures of tet
Subject: Micelas gigantes
Calorimetria
Técnicas de espalhamento
Country: Estados Unidos
Editor: American Chemical Society
Citation: Calorimetric And Light Scattering Investigations Of The Transition From Spherical To Wormlike Micelles Of C(14)tab Triggered By Salicylate. Amer Chemical Soc, v. 31, p. 6020-6026 Jun-2015.
Rights: fechado
Identifier DOI: 10.1021/acs.langmuir.5b01027
Address: https://pubs.acs.org/doi/abs/10.1021/acs.langmuir.5b01027
Date Issue: 2015
Appears in Collections:IQ - Artigos e Outros Documentos

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