Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Elastomers and Gels
CPP 49.4: Vortrag
Freitag, 26. März 2010, 11:00–11:15, H48
Magnetically induced surface instabilities in a thermoreversible ferrogel — •Tobias Lang1, Christian Gollwitzer1, Marina Krekhova2, Günther Lattermann2, Ingo Rehberg1, and Reinhard Richter1 — 1Experimentalphysik V, Universität Bayreuth — 2Makromolekulare Chemie I, Universität Bayreuth
The viscoelastic properties of thermoreversible ferrogels [1] can be tuned via temperature variation, making them an exciting type of magnetic soft matters. We study the formation of surface instabilities in a layer of thermoreversible ferrogel when exposed to a homogenous vertical magnetic field. The dynamics of the surface evolution is recorded using an specialized X-ray technique [2]. The ferrogel samples are characterized using rheological and magnetometer measurements. The critical magnetic field for the formation of Rosensweig cusps [3] is determined and compared to theoretical predictions [4]. In a conduction to [5] the growth rates of the emerging Rosensweig patterns are measured.
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