STABILIZATION OF DISPERSED SYSTEMS/ NANOPARTICLES BY POLYMERS

by Sandor Barany (University of Miskolc, Hungary)

Wednesday 30 May 2012, 15:00 → 16:00 Europe/Rome

Aula 8 (Dipartimento di Fisica - Ed E. Fermi)

The laws and mechanisms of stabilization of disperse systems, including nanoparticles, by non-ionic polymers and polyelectrolytes are considered. The effect of the polymer nature, its molecular mass, charge density and dose, as well as the role of the particles size and concentration in the stabilization of colloids are discussed. The contribution of van der Waals attraction, electrostatic, structural (hydration) and steric (volume restriction and mixing effects) repulsion in the mechanism of stabilization by polymers is considered. The laws of stabilization of polydisperse systems are described. Typical results of direct measurements of repulsion forces between adsorbed polymers are presented. Preparation of silver, gold and some metal oxide nanoparticles as well as biocolloids and their stabilization by polymer layers are described.