Berlin 2008 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 18: SYMPOSIUM Driven Soft Matter III

CPP 18.1: Invited Talk

Tuesday, February 26, 2008, 16:30–17:00, C 130

Bifurcations in complex fluids — •Ingo Rehberg and DFG-Forschergruppe 608 — Universität Bayreuth

The dynamic behavior of complex fluids in the neighborhood of bifurcation points is considered as particularly interesting, because here small changes of the external field lead to a maximal response. Moreover, the reaction of the fluid if often accompanied by symmetry breaking processes, which can be experimentally detected with great precision. In particular, we will present measurements of the reorientation of liquid crystalline gels under electric fields [1], and of the dynamic response of magnetic fluids to the change of external magnetic fields [2,3].

[1] Freedricksz transition in a thermoreversible nematic liquid gel; Matthias Müller, Wolfgang Schöpf, Ingo Rehberg, Günter Lattermann, Andreas Timme (submitted).

[2] Reorientation of a hexagonal pattern under broken symmetry: The hexagon flip; Christopher Groh, Reinhard Richter, Ingo Rehberg, and F. H. Busse, Phys. Rev. E 76, 055301(R) (2007).

[3] Response of a ferrofluid to travelling stripe forcing; Achim Beetz, Christian Gollwitzer, Reinhard Richter, Ingo Rehberg (submitted).