Local structure of polymeric ferrogels

José Alberto Galicia (1) , Fabrice Cousin (2) , Emmanuelle Dubois (3) , Valérie Cabuil (3) , Olivier Sandre (3) , Régine Perzynski (3)

1 Fac. de Ing.Quimica, Benemerita Univ. Autonoma de Puebla
2 GDPA - Groupe Diffusion petits angles
3 PECSA - Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques

We synthesize hybrid gels incorporating ‐ nanoparticles (NPs), citrate coated, in a polyacrylamide (PAM) network. The local organisation and the rotational degrees of magnetic nanoparticles are probed in the conditions of gel synthesis and also at swelling equilibrium, to correlate the homogeneous/inhomogeneous structure of the ferrogels to the synthesis parameters and to their macroscopic elasticity. NP adsorption on the PAM network at low citrate concentration is responsible for the reinforcing of the polymer structure. At higher citrate concentration, due to a competition between citrate and NPs, the nanoparticles desorb from the polymer structure weakening the system.

Mots clés: 8235NP; Magneto-optical effect; 6105fg; 7820Ls Keywords: Nanoparticles in polymers; Nanoparticles in polymers; Neutron scattering

Domaines: Polymères; Matériaux; Matière Molle [cond-mat.soft]

José Alberto Galicia, Fabrice Cousin, Emmanuelle Dubois, Valérie Cabuil, Olivier Sandre, et al.. Local structure of polymeric ferrogels. Journal of Magnetism and Magnetic Materials, 2010, 323 (10), pp.1211-1215. ⟨10.1016/j.jmmm.2010.11.008⟩. ⟨hal-02169248⟩