Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: Poster: Interfaces and Thin Films (joint session with DECHEMA and VDI)
CPP 9.31: Poster
Monday, March 11, 2013, 17:30–19:30, Poster C
Brushes of weak Polyelectrolytes (PE): Complex interactions with Solvent and Gold Nanoparticles — •Zuleyha Yenice1, Jan Genzer2, Ralf Köhler1,3, and Regine v.Klitzing1 — 1Stranski Lab, Inst. of Chemistry, TU Berlin, Germany — 2Dept. of Chemical & Biomolecular Engineering, NCSU, Raleigh, USA — 3Inst. of Soft Matter and Functional Materials, HZB, Berlin, Germany
PE-brushes represent a new class of thin film materials with tunable surface parameters and interactions, allowing functionalisation, or incorporation and exchange of solvents or particles. The swelling behaviour of PDMAEMA-brushes* was investigated by means of different solvents as ethanol and water of varying pH, and different water vapours. This ellipsometric study revealed a complex picture of the internal interactions of PE-brushes. Neutron reflectometry (NR) was used to determine, first, the structure of these films, either collapsed in dry state, or fully extended when swollen in buffer, secondly, the distribution and penetration depth of gold nanoparticles (Au-NP) in these brushes, after the exposure to suspensions of Au-NP with ca 5 or 15nm diameter. The study showed a comparatively homogeneous distribution of the brush length for our preparation technique. It proved that nanoparticles were incorporated into the PE-brushes irrespective from the size of the Au-NP and the length of the brush. But due to the complexity of the system it was not possible to determine a profile or horizon of deposition for the gold particles up to now. PE-brushes open a wide field for applications, and manifold of interesting, fundamental questions as well. *poly[2-(dimethylamino) ethyl methacrylate]