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BP: Fachverband Biologische Physik

BP 15: Biopolymer Solutions and Networks

BP 15.7: Vortrag

Dienstag, 27. März 2007, 16:45–17:00, H44

Active and passive microrheology — •Daisuke Mizuno^1,2, Fredrick MacKintosh¹, and Christoph Schmidt^1,2 — ¹Department of Physics and Astronomy, Vrije Universiteit, Amsterdam, The Netherlands — ²III. Physikalisches Institut, Fakultät f. Physik, Georg-August-Universität, Göttingen, Germany

We have developed active and passive, 1- and 2-particle microrheology (MR) using micron-sized colloidal particles as probes. Two laser beams focused through a microscope objective serve to both detect probe motion and exert controlled forces on the probes. Both active and passive MR can be done in a frequency range of 0.1Hz to 100 kHz. We compare results on model systems and discuss pros and cons of both technologies.