Regensburg 2007 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

SYPE: Symposium Polyelectrolytes

SYPE 2: Polyelectrolytes I

SYPE 2.5: Vortrag

Donnerstag, 29. März 2007, 15:15–15:30, H37

Self-assembly of thermoresponsive polyelectrolyte microgels on polyelectrolyte coated surfaces — Stephan Schmidt¹, •Thomas Hellweg², and Regine von Klitzing² — ¹MPI KGF, Wissenschaftspark Golm, 14424 Potsdam, Germany — ²TU Berlin, Stranski-Lab., Strasse des 17.Juni 124, 10623 Berlin, Germany

PNIPAM-co-poly(acrylic acid) micorgels are deposited on poly(ethylene imine) coated silicon wavers using the well known layer-by-layer approach. The obtained surface coverage strongly depends on the degree of charge of the microgels, which is controled via the pH-value of the used buffer. at intermediate pH (approx. 6) a coverage of about 40 % is obtained and the formation of island strcuctures can be observed. However, placing these surfaces in a similar buffer a second time leads to a complete rearangement of the structure. Highly ordered surface pattern are obtained. The process is studied in situ using confocal microscopy. In addtion ellipsometry and AFM measurements are perfromed to characterize the prepared surfaces.