Berlin 2008 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 6: Ferrofluids
DY 6.1: Vortrag
Montag, 25. Februar 2008, 14:30–14:45, A 053
The Rosensweig instability in thermoreversible ferrogels — •Christian Gollwitzer1, Marina Krekhova2, Ingo Rehberg1, Günter Lattermann2, and Reinhard Richter1 — 1Experimentalphysik V, Universität Bayreuth — 2Makromolekulare Chemie I, Universität Bayreuth
Ferrogels are an interesting new class of materials that enhance the properties of magnetic fluids by elastic components [1]. According to Bohlius et al. [2], the famous Rosensweig instability should also be possible in ferrogels. Compared to the pure ferrofluid, the critical magnetic field is shifted to higher values due to elastic forces, and the critical wavenumber remains the same.
We use a thermoreversible ferrogel [3] and expose it to a homogeneous magnetic field. By controlling the temperature we can easily change the elastic modulus over several orders of magnitude. The surface profile of the ferrogel is then recorded using an X-ray technique.
[1] Zrinyi, M., Barsi, L., Szabo, D. & Kilian, H.-G. 1997
The Journal of Chemical Physics 106 (13), 5685–5692.
[2]Bohlius, Brand & Pleiner 2006 Z. Phys. Chem
220, 97
[3]Lattermann, G. & Krekhova, M. 2006 Macromol. Rapid Commun. 27, 1373–1379.