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Weiche Materie Poster: Do., 13:00–15:30 D-P322
Magnetic particles in supported polymer structure
M. M. Abul Kashem 1 , L. Schulz 1 , J. Perlich 1 , S. V. Roth 2 , P. Müller-
Buschbaum 1
1 TU München, Physik-Department E13, James-Franck-Str. 1, D- 85747 Garching,
Germany – 2 HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg, Germany
A new class of composite materials is formed from the addition of magnetic particles
in supported polymer nano-structures. The great potential of these composites are the
substantial modification of the magnetic properties of polymers. The polymer nanostructures
act as a template and enable a completely new arrangement of magnetic
particles which is inaccessible with common magnetic materials [1]. The controlled
incorporation of the magnetic particles (iron oxide) covered by polystyrene hairs yields
to magnetic properties of the polymer composite. The polymer films containing particles
are prepared by the spin-coating technique on the top of solid support. We
use the diblock copolymer, polystyrene-block-polyisoprene, denoted by P(S-b-I), with
a symmetric degree of polymerization of both monomer types. The nano-structures
are created by additional preparation resulting in dewetting and micro-phase separation
of P(S-b-I). Dewetting creates a drop-like structure of the polymer matrix. The
self assembly process due to micro-phase separation inside such a superstructure produces
an ordered nano-structure. Magnetic particles arrange themselves inside this
nano-structured polymer matrix. Organization in a particular block is due to the selective
affinity to one block in the diblock copolymer P(S-b-I). Such superstructure
hosted nanoparticles are investigated with grazing incident small angle x-ray scattering
(GISAXS) and atomic force microscopy (AFM). GISAXS experiments are carried
out with synchrotron radiation at the beam line BW4 at HASYLAB, DESY, Hamburg.
GISAXS gives us information (e.g., average statistics of length, height, and periodicity)
of structures of nano- to micro- scale present inside the polymer films and on the
surface [2]. Real space analysis by AFM provides us image of the structured surface in
real space. Some of results of our investigation are presented.
[1] V. Lauter-Pasyuk, H. J. Lauter, G. P. Gordeev, P. Müller-Buschbaum, B .P. Toperverg,
M. Jernenkov, W. Petry; Langmuir 19 (2003) 7783
[2] P. Müller-Buschbaum; Anal. Bioanal. Chem. 376 (2003) 3