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AKB: Biologische Physik
AKB 25: Cell Mechanics I
AKB 25.6: Vortrag
Donnerstag, 30. März 2006, 16:15–16:30, ZEU 260
High-frequency stress relaxation in semiflexible polymer solutions and networks — •Gijsberta H. Koenderink1, Maryam Atakhorrami2, Frederick C. MacKintosh2, and Christoph F. Schmidt2 — 1Division of Engineering and Applied Sciences, Harvard University, Cambridge, USA — 2Dept. Physics, Vrije Universiteit, Amsterdam, NL
We measure the linear viscoelasticity of sterically entangled as well as chemically crosslinked networks of actin filaments over more than five decades of frequency. The high-frequency response reveals rich dynamics unique to semiflexible polymers, in particular a previously unobserved relaxation due to rapid axial tension propagation. For high molecular weight, and for crosslinked gels, we obtain quantitative agreement with theoretical predictions of the shear modulus in both amplitude and frequency dependence.