Dresden 2009 – wissenschaftliches Programm
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SYSO: Symposium Self-organizing Surfaces and Interfaces
SYSO 4: Self-Organizing Surfaces and Interfaces III
SYSO 4.5: Vortrag
Donnerstag, 26. März 2009, 10:30–10:45, GÖR 226
Sensitive Tethered Membranes — •Marco Werner1,2 and Jens-Uwe Sommer1,2 — 1Leibniz Institute of Polymer Research Dresden, Germany — 2Technische Universität Dresden - Institute for Theoretical Physics
We study static and dynamical properties of tethered structures such as membranes and fractal polymer objects embedded in three-dimensional space using the Bond-Fluctuation-Model. Tethered structures can be distinguished by their internal connectivity characterized by their spectral dimension. For two-dimensional structures (perfect membranes) we can confirm the theory of excluded volume induced stiffness which leads to flat membranes on larger scales [Kantor and Kremer, 1993, Phys. Rev. E, 48(4):2490]. By contrast, for fractal objects such as Sierpinski gaskets we obtain crumpled structures with a fractal dimension in good agreement with mean-field arguments [Kantor et al., 1986, Phys. Rev. Lett., 57(7):791].
Furthermore, we have investigated tethered membranes where one side is grafted with linear chains under variation of grafting density, chain-length and solvent-quality. We demonstrate switching between convex and concave spontaneous bending by changing the solvent quality of the linear chains. In athermal solvent, the crossover between spontaneous bended state and flat state of the decorated membrane is controlled by the overlap density of the chains indicating that the self-organized bending stiffness of thethered membranes is of the order of kT.