Sonderforschungsbereich 481

    Komplexe Makromolekül- und Hybridsysteme in inneren und äußeren Feldern

Subproject A12:


Prof. Matthias Ballauff (Physical Chemistry I)
Prof. Axel H.E. Müller (Macromolecular Chemistry II)

The aim of the project is a thorough understanding of the phase behavior and dynamics of charged star polymers in aqueous solution. We have already proven experimentally some predictions of the theory, like the dependence of the osmotic pressure on the arm number or the contraction of stars in presence of multivalent counterions. By continuing our work we want to thoroughly investigate mainly cationic stars. To do so, parameters like star concentration, valency of counterions, temperature and the architecture of the stars (arm length and arm number) will be varied. Specific interactions between counterions and star polymers are of interest. Attractive interactions, which can be triggered by temperature changes, will play a role (in particular, LCST). All experimental findings shall be compared with results of MD simulation and analytical theory. The search for ordered structures in concentrated polyelectrolyte star solutions will continuously be a major topic. In addition we want to intensify the work regarding the manipulation of charged star polymers with help of external stimuli (e.g., light => „nanoblossoms“) and investigate their potential use in nanotechnology.
AFM Analyse von spin-gecoateten Sternpolymerlösungen ((PMETAI170)18; ~ 0.005 g/L) auf Glimmer (links: ohne trivalente Gegenionen, dialysiert gegen reines Wasser von 0.1 N NaCl; rechts: dialysiert gegen reines Wasser von 0.1 N NaCl und 3.7 . 10-4 mol/L [Co(CN)]3-); unten: vergrößerte 3D-Representationen)

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