Physik-Kolloquium

Prof. Dr. S. Hollands
Prof. Dr. R. Seidel
Fakultät für Physik und Geowissenschaften
Physik-Kolloquium
Dienstag, den 07.06.2016, 16.00 Uhr
Prof. Dr. Regine von Klitzing
Department of Chemistry, Applied Physical Chemistry, TU Berlin
Stimuli Sensitive Polymer Coatings with different
film architectures triggered by light
For fabrication of stimuli responsive coatings one challenge is to generate stable films which are still mobile and
sensitive to outer parameters. The talk will focus on 2 different types of thin polymer films at solid interfaces: 1)
films formed by deposition of hydrogel microgels and 2) polymer brushes. Both architectures have in common that
they consist of N-isopropylacrylamide (NIPAM) monomers.
During the last decades microgels made of N-isopropylacrylamide (NIPAM) have attracted much interest and were
studied by several techniques like microscopy and light scattering. These polymer particles show thermoresponsive
behaviour and can therefore be classified as “smart” materials. By copolymerisation with organic acids such as
acrylic acid (AAc) the temperature of the volume phase transition as well as the swelling ratio can be influenced.
Moreover charged copolymers are sensitive to changes in pH and ionic strength. Our work focuses on the
fabrication of stimuli responsive films and on the effect of geometrical confinement on the phase volume transition
of these microgel particles [1]. The effect of cross-linker and co-monomers on the swelling behaviour and on the
elasticity is presented [2]. The second example is coating with PNIPAM brushes synthesized via ATRP and grafting
from method [3].
Beside pH, temperature or solvent [4] light is a very efficient stimulus, since it can trigger quite fast and local the
volume phase transition. Therefore additives like surfactants with azobenzene groups [5] and gold nanoparticles
[6,7] are embedded within both microgels and brushes. In case of gold nanoparticles, the change in optical
properties of microgels and brushes and the impact of gold nanoparticles as hot spots is studied.
Selected Publications:
[1] A. Burmistrova, R. von Klitzing J. Mat. Chem, 2010, 20, 3502.
[2] A. Burmistrova, M. Richter, C. Üzüm, R. von Klitzing, Coll. Polym. Sci. 2011, 289, 613.
[3] S. Christau, S. Thurandt, Z. Yenice, R. von Klitzing Polymers 2014, 6 1877.
[4] M. Richter, M. Hunnenmörder, R. von Klitzing Coll. Polymer Sci. 2014, 292 2439.
[5] Y.Zakrevskyy, M. Richter, S. Zakrevska, N. Lomadze, R. von Klitzing, S. Santer Advanced Funtional Materials 2012, 22 5000.
[6] K. Gawlitza, S. T. Turner, F. Polzer, S. Wellert, M. Karg, P. Mulvaney, R. von Klitzing PCCP 2013, 15 15623.
[7] S. Christau, T. Möller, F. Brose, J. Genzer, O. Soltwedel, R.von Klitzing Polymer, 2016.
Ort: Hörsaal für Theoretische Physik, Linnéstraße 5
Alle Teilnehmer sind ab 15.30 Uhr zu Kaffee vor dem Hörsaal eingeladen.

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