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CP: Chemische Physik
CP 31: Poster: Große Moleküle und Aggregate
CP 31.1: Poster
Monday, March 22, 1999, 18:00–20:00, R52/R72
Tapping Mode Force Microscopy Imaging of Elastic Properties of Core-Shell Latex Particles — •Inga Stapff1, Gerd Weidemann1, Carsten Schellenberg2, Matthias Regenbrecht1, Sabri Akari1, and Markus Antonietti2 — 1Max-Planck-Institut fuer Kolloid-und Grenzflaechenforschung, Rudower Chaussee 5, Haus 9.9, 12489 Berlin — 2Max-Planck-Institut fuer Kolloid-und Grenzflaechenforschung, Kantstr. 55, 14513 Teltow
In this study films of core-shell structured latex particles are
investigated by dynamic Scanning Force Microscopy ”tapping mode
imaging”. Polymer dispersions with cores of the low viscosity
poly(2-ethylhexyl methacrylate (PEtHMA) and shells of the cross
linked rubber Poly(n-buty acrylate) (PBA) were spread on a flat
mica surface to form a monolayer. Topographic as well as phase
images were recorded at different amplitudes and damping factors
(so called soft and hard tapping). While the topographic images
are showing a continuos matrix formed by the particles, a clear
contrast of individual particles in the phase images could be
obtained at high damping factors of the cantilever oscillation.
The soft cores embedded in the matrix of the shell polymers
caused percptible reduction of the phase of the oscillation.
Consequently, the total particle appeared soft enough since it allowed
deformation of the soft cores below.