Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 1: Critical phenomena and phase transitions
DY 1.7: Vortrag
Montag, 25. Februar 2008, 11:45–12:00, MA 004
Investigation of adsorption of star polymers in the framework of massive field theory approach — •Zoryana Usatenko — Leibniz Institute for Polymer Research Dresden e.V., 01069 Dresden, Germany — Institute for Condensed Matter Physics, NAS Ukraine, 79011 Lviv, Ukraine
Adsorption on a planar repulsive and "inert" wall of a star polymer with f arms with the same length immersed in a good solvent are studied on the basis of renormalization group field theoretical approach directly in d=3 dimensions for one-loop order. The performed scaling analysis is based on formal analogy between the polymer adsorption problem and the equivalent problem of critical phenomena in the semi-infinite n-vector model (in the limit n→0) with a planar boundary. The case of a center adsorbed star and star polymer with two adsorbed arm ends are considered. We have calculated the configuration-number exponents γ(f) for center adsorbed star and γII(f) for two ends adsorbed star polymer. The obtained results for critical exponents are compared with results obtained in the framework of є - expansions. We also calculated the mean force between free star polymer and surface.