| Schmidt, K.; Schoberth, H. G.; Schubert, F.; Hänsel, H.; Fischer, F.; Weiss, T.M.; Sevink, G.; Zvelindovsky, A.V.; Böker, A.; Krausch, G.: Scaling Behavior of the Reorientation Kinetics of Block Copolymers exposed to Electric Fields, Soft Matter, 3, 448 - 453 (2007), doi:10.1039/b614143a | |
| Abstract: We have followed the reorientation kinetics of various model block copolymer solutions exposed to an external electric DC field. The characteristic time constants follow a power law indicating that the reorientation is driven by a decrease in electrostatic energy. Moreover, the observed exponent suggests an activated process in line with the expectations for a nucleation and growth process. When properly scaled, the data collapse onto a single master curve spanning several orders of magnitude both in reduced time and in reduced energy. Computer simulations based on dynamic density functional theory quantitatively agree with the experimental observation. First experiments in AC electric fields at sufficiently high frequencies confirm the notion that the reorientation process is dominated by differences in the dielectric constants rather than by mobile ions.  Cover Soft Matter 4/2007 - link to full text |
Sonderforschungsbereich 481
Komplexe Makromolekül- und Hybridsysteme in inneren und äußeren Feldern
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