Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: Interfaces and Thin Films II
CPP 7.7: Vortrag
Montag, 14. März 2011, 15:45–16:00, ZEU 114
Dynamics of complex systems in the proximity of a solid interface — •Sulivan D.B. Vianna1, Markus A. Plum1, Hatice Duran1,2, Hans-Jürgen Butt1, and Werner Steffen1 — 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany — 2TOBB Economy and Technology University 43, 06560 Ankara, Turkey
An experimental investigation of the effect of solid surfaces (e.g Au) on the motion of colloids and dynamics of polymers is reported. The novel experimental approach for probing the interphase in a system close to the solid interface is the use of surface plasmons or optical waveguide modes as incident fields in resonance enhanced dynamic light scattering (REDLS) or waveguide enhanced dynamic light scattering (WEDLS). Our incident fields are localized at the surface. For surface plasmons the penetration depth is typically 200 nm and for the waveguides the penetration depth can be tuned typically from 100 to 1000 nm. The influence of a nearby interface on translational and rotational diffusion of colloids in solution is explored. Due to the localization and hence strong enhancement of the field in the surface plasmon or the evanescent part of the waveguides utilized, we are able to study ultrathin polymer films, i.e. dynamic processes above the glass transition.