[Todos] Seminarios DQIAyQF INQUIMAE/ Lunes 8 de Mayo, 13h

[sara elizabeth bari]

Seminarios del Dpto. de Química Inorgánica, Analítica y Química Física / INQUIMAE

FCEyN - Universidad de Buenos Aires

http://www.qi.fcen.uba.ar/es

 

1er. Cuatrimestre, 2006

 

 

Lunes 8 de mayo, 13.00h
Aula Seminarios, DQIAyQF- INQUIMAE

Ciudad Universitaria, Pab. II, Piso 3 

 

 

Dominique Langevin

 

Laboratoire de Physique des Solides

Université Paris Sud, Orsay, France

 


Polyelectrolyte/surfactant aggregates. Influence of the polymer backbone rigidity

 

Siwar Trabelsi, Daragh McLoughlin, Samuel Guillot, Dominique Langevin*



Studies of aqueous solutions of polyelectrolytes and surfactants of opposite charges will be presented. Various techniques have been used: specific electrodes, scattering of light, X-ray and neutrons, electrophoretic mobility. We will show results obtained with cationic surfactants and anionic polyelectrolytes of different backbone rigidity, including DNA. In some cases, we find well defined aggregates, with a size controlled by the surfactant concentration. These aggregates possess an internal structure, similar to that of the liquid crystalline phases obtained in the precipitated phases obtained at higher surfactant concentrations.

 

 

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