Münster 1999 – wissenschaftliches Programm

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CP: Chemische Physik

CP 20: Große Moleküle und Aggregate

CP 20.1: Vortrag

Mittwoch, 24. März 1999, 16:15–16:30, Phy

X-ray investigations of the molecular mobility within polymer surface gratings — •Thomas Geue¹, Markus Schultz¹, Joerg Grenzer¹, Ullrich Pietsch¹, Almeria Natansohn², and Paul Rochon³ — ¹Institute of Physics, University of Potsdam, P.O.B. 601553, D-14415 Germany — ²Department of Chemistry, Queen’s University, Kingston, Ontario, Canada K7L 3N6 — ³Department of Physics, Royal Military College, Kingston, Ontario, Canada K7K 5L0

As previously demonstrated [1,2] laterally patterned surface

gratings can be defined onto the surface of amorphous polymers

containing azobenzene-side chains using holographic exposure

with visible light of about 450 nm. The holographic lateral

periodic illumination provides a non-uniform cis-trans

isomerisation of the azobenzene-side groups induces a material

transport from regions of higher to lower local density of mass.

This results in the creation of a periodic surface grating with

approximately sinusoidal shape. Depending on the power of

illumination the grating depth can approach several 100 nm.

The nature of the induced material transport is not yet finally

understood up to now. Investigations on the origin of the

material flow require time-resolved structure investigations

which we have performed by coherent X-ray scattering at the

mesoscopic surface grating.