Structure of vesicles in homogeneous short-chain polyoxyethylene cholesterol ether systems

Citation
C. Rodriguez et al., Structure of vesicles in homogeneous short-chain polyoxyethylene cholesterol ether systems, COLL SURF A, 181(1-3), 2001, pp. 237-246
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
ISSN journal
0927-7757 → ACNP
Volume
181
Issue
1-3
Year of publication
2001
Pages
237 - 246
Database
ISI
SICI code
0927-7757(20010615)181:1-3<237:SOVIHS>2.0.ZU;2-9
Abstract
Mixtures of the homogeneous nonionic surfactant trioxyethylene cholesterol ether, ChEO(3) and water were examined by microscopy, small-angle X-ray sca ttering, differential scanning calorimetry, electron-spin resonance and flu orescence spectrometry. A lamellar liquid-crystalline phase with peculiar c haracteristics is found above 75% of surfactant concentration. This phase s eems to consist of a rather rigid and ordered bilayer when compared with ty pical L-alpha-phases although the degree of crystallinity is less than that of Lp-phases in nonionic systems with the same EO chain. The peculiarities of this phase are attributed to the rigid and bulky hydrophobic group of s urfactant. The dispersion of this lamellar phase in water leads to the form ation of very stable vesicles with a wide range of morphologies at rather l ow surfactant concentrations. (C) 2001 Elsevier Science B.V. All rights res erved.