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The steric polymer layer of hairy wormlike micelles

G Massiera1, L Ramos1, E Pitard2 and C Ligoure1,3

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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.


PACS

82.70.Uv Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems, (hydrophilic and hydrophobic interactions)

68.55.-a Thin film structure and morphology

Subjects

Soft matter, liquids and polymers

Surfaces, interfaces and thin films

Chemical physics and physical chemistry

Dates

Issue 1 (15 January 2003)

Received 24 October 2002

Published 16 December 2002



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