Volume 58, Number 6, June 2002
|Page(s)||912 - 918|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 June 2002|
Novel core-shell structure for colloids made of neutral/polyelectrolyte diblock copolymers and oppositely charged surfactants
Complex Fluids Laboratory, CNRS-Cranbury
Research Center Rhodia Inc. 259 Prospect Plains
Road CN 7500, Cranbury, NJ 08512, USA
2 Rhodia, Centre de Recherches d'Aubervilliers - 52 rue de la Haie Coq F-93308 Aubervilliers Cedex, France
3 IPNS Division, Argonne National Labs 9700 South Cass Avenue, Argonne IL 60439, USA
4 Laboratoire Léon-Brillouin, CEA Saclay - F-91191 Gif-sur-Yvette, France
5 Institute Laue-Langevin - BP 156, F-38042 Grenoble cedex 9, France
Corresponding author: firstname.lastname@example.org
Accepted: 20 March 2002
Using neutron and light scattering experiments, we show that neutral/poly- electrolyte diblock copolymers and oppositely charged surfactants in dilute aqueous solutions associate into colloidal aggregates which have an original core-shell microstructure. We have found that the core is constituted of densely packed surfactant micelles, most likely connected between them by the polyelectrolyte blocks. The outer part of the colloid is a corona and is made of the neutral chains. We suggest that the mechanism of formation of these colloids is identical to that of the associative transition reported in homopolyelectrolyte/surfactant solutions. However, here, the macroscopic phase separation is hindered by the presence of the neutral chains.
PACS: 82.70.Dd – Colloids
© EDP Sciences, 2002
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