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Polymer-surfactant vesicular complexes in aqueous medium

DOI: 10.1021/la703745z DOI Help
PMID: 18315019 PMID Help

Authors: A. Kelarakis (University of Athens) , Valeria Castelletto (University of Reading) , V. Havredaki (University of Athens) , K. Viras (National and Kapodistrian University of Athens) , Ian Hamley (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Langmuir , VOL 24 (8) , PAGES 3767-3772

State: Published (Approved)
Published: January 2008

Abstract: The introduction of ionic single-tailed surfactants to aqueous solutions of EO18BO10 [EO = poly(ethylene oxide), BO = poly( 1,2-butylene oxide), subscripts denote the number of repeating units] leads to the formation of vesicles, as probed by laser scanning confocal microscopy. Dynamic light scattering showed that the dimensions of these aggregates at early stages of development do not depend on the sign of the surfactant head group charge. Small-angle X-ray scattering (SAXS) analysis indicated the coexistence of smaller micelles of different sizes and varying polymer content in solution. In strong contrast to the dramatic increase of size of dispersed particles induced by surfactants in dilute solution, the d-spacing of corresponding mesophases reduces monotonically upon increasing surfactant loading. This effect points to the suppression of vesicles as a consequence of increasing ionic strength in concentrated solutions. Maximum enhancements of storage modulus and thermal stability of hybrid gels take place at different compositions, indicating a delicate balance between the number and size of polymer-poor aggregates (population increases with surfactant loading) and the number and size of polymer-surfactant complexes (number and size decrease in high surfactant concentrations).

Subject Areas: Chemistry, Materials

Instruments: NONE-No attached Diamond beamline

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