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(119) Production(s) de LIGOURE C.
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Temporal heterogeneity of the slow dynamics of a colloidal paste.
Auteur(s): Ballesta P., Ligoure C., Cipelletti L.
Conférence invité: AIP (, FR, 2004)
Actes de conférence: AIP Conf. Proc., vol. 708 p.68 (2004)
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The steric polymer layer of hairy wormlike micelles
Auteur(s): Massiera G., Ramos L., Pitard E., Ligoure C.
(Article) Publié:
Journal Of Physics: Condensed Matter, vol. 15 p.S225-S231 (2003)
Résumé: Hairy wormlike micelles are constituted of surfactant micelles onto which amphiphilic copolymers are adsorbed. The copolymer layer induces a steric repulsion between the micelles, which is evidenced by the emergence of a broad peak in the structure factor for semi-dilute solutions. In this paper, we propose three experimental determinations of the thickness of the copolymer layer, h. We compare the results of the different approaches and show that both the numerical values of h and its variation with the surface density of the copolymer layer are in very good agreement with simple theoretical expectations.
Commentaires: English Article Sp. Iss. SI 669HX
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Structure Factor of Polymers Interacting via a Short Range Repulsive Potential: Application to Hairy Wormlike Micelles
Auteur(s): Massiera G., Ramos L., Ligoure C., Pitard E.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 68 p.021803 (2003)
Texte intégral en Openaccess :
Ref HAL: hal-00338950_v1
PMID 14524997
DOI: 10.1103/PhysRevE.68.021803
WoS: 000185193900060
Exporter : BibTex | endNote
9 Citations
Résumé: We use the random phase approximation to compute the structure factor S(q) of a solution of chains interacting through a soft and short range repulsive potential V. Above a threshold polymer concentration, whose magnitude is essentially controlled by the range of the potential, S(q) exhibits a peak whose position depends on the concentration. We take advantage of the close analogy between polymers and wormlike micelles and apply our model, using a Gaussian function for V, to quantitatively analyze experimental small angle neutron scattering profiles of solutions of hairy wormlike micelles. These samples, which consist in surfactant self-assembled flexible cylinders decorated by amphiphilic copolymer, provide indeed an appropriate experimental model system to study the structure of sterically interacting polymer solutions.
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Electrostatic Effects in Equilibrium Polyelectrolyte Block copolymer Micelles.
Auteur(s): Morel Alain, In M., Ligoure C., Deroo S., Destarac M.
Conference: XVII Conference of the European Colloid and Interface Society (Florence, Italy, FR, 2003)
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Hairy wormlike micelles: structure and interactions.
Auteur(s): Massiera G., Ramos L., Pitard E., Ligoure C.
Conference: 11th International Conference on Colloidal and Surface Science (Foz do Iguaçu, Brasil, FR, 2003-09-15)
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Viscoelastic properties of hairy wormlike micelles.
Auteur(s): Ligoure C.
Conference: CECAM/ESF Workshop Mesoscopic models of polymer dynamics. (Lyon, France, FR, 2003-02-03)
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Hairy wormlike micelles: an experimental model to adress the role of polydispersity and connections in the viscoelastic properties of polymer solutions
Auteur(s): Ligoure C.
Conférence invité: Jûlich Soft Matter days 2003. (Kerkrade, NL, 2003-11-18)
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