Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/85744
Type: Artigo de periódico
Title: Influence Of Organic Acids On Surfactant Self-assemblies In Surfactant/oil/water Systems
Author: Fasolin L.H.
Santana R.C.
Cunha R.L.
Abstract: The cosurfactant effect of short-chain organic acids (acetic and propionic acids) and their behavior in relation to the oil prevailing unsaturation (HOSO or sunflower oil) was evaluated from SAXS and rheological measurements in systems formed by water, oil, Tween80 and the organic acid. Self-assemble of the surfactants was influenced by the structure and ratio of the components, which formed different structures (microemulsions and liquid crystal) with different rheological behaviors. The water content exerted influence on the organization of the surfactant moieties and on the dissociation of the cosurfactant, modifying its partition to the water phase. Systems with acetic acid formed more rigid structures with higher viscosity, shear-thinning behavior and bigger distances between the structures due to the tendency of this acid to migrate to water phase. On the other hand, propionic acid was less susceptible to dissociation, being in its neutral form, which makes it able to remain at the interface and solubilize higher oil content. As a result, structures were softer with lower viscosity and slightly smaller distances between them. The interaction between oil and cosurfactant exerted influence on the colloidal properties that reflected on bulky properties. In general, the more hydrophobic oil (sunflower oil) facilitated the partition of the acetic acid to the water, giving to this structure greater distance, as compared to HOSO. +. acetic acid. Thus, small differences in the structure of the components can influence the interaction between them, changing the partition of the components and the surfactant behavior. © 2014 Elsevier B.V.
Editor: Elsevier
Rights: fechado
Identifier DOI: 10.1016/j.colsurfa.2014.07.010
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84905227462&partnerID=40&md5=e8ac2440034de2c832f82e3737c2afb7
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
2-s2.0-84905227462.pdf1.26 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.