Regensburg 2007 – wissenschaftliches Programm

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SYPE: Symposium Polyelectrolytes

SYPE 2: Polyelectrolytes I

SYPE 2.1: Hauptvortrag

Donnerstag, 29. März 2007, 14:00–14:30, H37

Coulomb and Flory: Fathers of SONS. Polyelectrolytes in Self Organized Nano Systems — •Martien Cohen Stuart — Laboratory of Physical Chemistry and Colloid Science, Wageningen University, P.O. Box 8038, 6700 EK Wageningen,The Netherlands

Supramolecular chemistry exploits the many non-covalent interactions between molecules to create novel and functional structures. A most versatile interaction is the electrostatic force that emerges between ions and polyions. We have seen an enormous activity in recent years to fabricate novel materials using pairs of oppositely charged macromolecules; in particular, fabrication of thin films consisting of polyelectrolyte complexes by controlled deposition in alternating fashion has captured the imagination of many chemists and physicists. The debate concerning the description of these systems in terms of fundamental physical laws and chemical properties is going on.

In the present contribution we exploit the same tendency of oppositely charged chains to form a condensed phase, but we add new features, with the aim to make new complex and functional nanoparticles. The new feature is a 'stop mechanism' that suppresses growth of a macroscopic phase so that only small particles result. Connecting a neutral, water soluble to at least one of the polyelectrolytes participating in complexation, one will get micellar particles, which we call 'Complex Coacervate Core Micelles (C3M's), and which have been denoted as 'Poly Ion Complexes' (PIC's) or 'Block Ionomer Complexes' (BIC's) by others.