“The nature of the coacervate formed in the aqueous dodecyltrimethylammonium bromide – sodium 10-undecenoate mixtures”.

MARÍA BELÉN SIERRA, PAULA V. MESSINA, MARCELA A. MORINI, JUAN M. RUSO, GERARDO PRIETO, PABLO C. SCHULZ, FÉLIX SARMIENTO.

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

ELSEVIER

Año: 2006 vol. 277 p. 75 - 82

0927-7757

Abstract The formation of a coacervate in mixtures of dodecyltrimethylammonium bromide (DTAB)–sodium 10-undecenoate (SUD) aqueous mixtures was studied by light scattering, æ potential measurements, and electronic microscopy. The coacervate appears when the æ potential goes to zero, and the energy barrier against agglomeration disappears, promoting the agglomeration of micelles. Rod-like micelles agglomerate in bundles in the DTAB-rich side of the phase diagram, while spherical or globular micelles agglomerate in clusters in the SUD-rich side. This difference explains the differences in the transition micelles–coacervate in the opposite sides of the two-phase region. © 2005 Elsevier B.V. All rights reserved.æ potential measurements, and electronic microscopy. The coacervate appears when the æ potential goes to zero, and the energy barrier against agglomeration disappears, promoting the agglomeration of micelles. Rod-like micelles agglomerate in bundles in the DTAB-rich side of the phase diagram, while spherical or globular micelles agglomerate in clusters in the SUD-rich side. This difference explains the differences in the transition micelles–coacervate in the opposite sides of the two-phase region. © 2005 Elsevier B.V. All rights reserved. Keywords: Coacervate; Dodecyltrimethylammonium bromide; Sodium 10-undecenoate; Catanionic mixtures; Mixed surfactantsCoacervate; Dodecyltrimethylammonium bromide; Sodium 10-undecenoate; Catanionic mixtures; Mixed surfactants