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Nanostrukturen und Grenzflächen Poster: Do., 13:00–15:30 D-P295
Highly ordered self-organized copolymer-nanoparticle composite films studied
by specular reflectometry and off-specular neutron scattering
V. Lauter-Pasyuk 1,2 , H. Lauter 2 , M. Jernenkov 2,3 , B. Toperverg 4 , P.
Müller-Buschbaum 1 , W. Petry 1
1 TU München, Germany – 2 ILL, Grenoble, France – 3 JINR, Dubna, Russia – 4 PNPI,
Gatchina, Russia
How to organize complex materials at the nano-scale is investigated with neutron
grazing incidence techniques (specular reflection, off-specular scattering and grazing
incidence small angle scattering). A “smart” method based on the principle of selforganization
is employed to construct new nano-composite materials containing a high
density of magnetic nano-particles arranged into well ordered regular block-copolymer
lamellar structures. We investigated how the particle concentration and particle size
affect the architecture of the composite film. New morphologies predicted theoretically
[1] are obtained and explored in our studies. The creation of the nano-sheets was followed
up to the destruction of the ordering of the nanoparticles and of the polymer
lamellar structure. We show that the details of the internal structure of composite films
are encoded in the two-dimensional map of the intensity scattered by the film and can
be extracted via the quantitative data analysis. A dedicated theoretical approach based
on the distorted-wave Born approximation (DWBA) is developed for the analysis of the
full two-dimensional intensity. This approach will be applied to a wide range of technologically
important systems and can be used to design novel composite architectures.
This research project has been supported by the BMBF under the project No 03DU03MU.
[1] R.B. Thompson et al., Science 292, 2469 (2001)