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Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Elastomers and Gels

CPP 49.4: Talk

Friday, March 26, 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 Richter11Experimentalphysik 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.

[1] G. Lattermann and M. Krekhova, Macromol. Rapid. Commun. 27, 1273 (2006)
R. Richter and J. Bläsing, Rev. Sci. Instrum. 72, 1729 (2001)
M.D. Cowley and R.E. Rosensweig, J. Fluid Mech. 30, 671 (1967)
S. Bohlius, H. Brand, H. Pleiner, and M. Gels, Z. Phys. Chem., 220, 97-104 (2006)
C. Gollwitzer, M. Krekhova, G. Lattermann, I. Rehberg, R. Richter, Soft Matter 5, 2093 (2009)

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