Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: Single Molecules
CPP 15.5: Vortrag
Dienstag, 26. Februar 2008, 18:00–18:15, C 230
Unravelling single polymers on surfaces by scanning force microscopy manipulation — •Wei Zhuang1, Edis Kasemi2, Fikri E. Alemdaroglu3, A. Dieter Schlüter2, Andreas Herrmann3, and Jürgen P. Rabe1 — 1Department of Physics, Humboldt University Berlin, Newtonstr. 15, 12489 Berlin, Germany — 2Institute of Polymers, Swiss Federal Institute of Technology, ETH-Hönggerberg, HCI J 541, 8093 Zürich, Switzerland — 3Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
Scanning Force Microscopy (SFM) has become a powerful tool to reveal the superstructure of single polymer molecules as well as to manipulate individualized polymers on solid substratesinto supermolecular functional entities, which would not form spontaneously. The manipulation can be brought about by either exerting a heterogeneous point force with an SFM tip in contact to a single polymer, or by a so called blowing manipulation with a tapping tip, which can exert a homogeneous force to the single polymer with circular topology. Here, we report an SFM tip manipulation of single dendronized polymers (denpols), which allows to determine the self-organized superstructure of denpols and can finally unravel the duplex superstructure of single charged denpols absorbed on solid substrate upon vacuum drying. In addition, we report an SFM blowing manipulation of single DNA-PEG-DNA triblock copolymer, so that the ds-DNA and the organic polymer chain have been unravelled against random coil, which afforded for the first time to visualize all three blocks of a single linear triblock copolymer chain with recognizable contours by SFM.