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Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Elastomers and Gels

CPP 14.6: Vortrag

Dienstag, 15. März 2011, 12:00–12:15, ZEU 114

Magnetophoretic transport in thermoreversible ferrogels — •Tobias Lang1, Marina Krekhova2, Holger Schmalz2, Reinhard Richter1, and Ingo Rehberg11EP5, Universität Bayreuth — 2MC1, Universität Bayreuth

The viscoelastic properties of thermoreversible ferrogels [1] can be tuned via the temperature, making such gels an exciting type of magnetic soft matter [2]. Preliminary studies with these materials showed a separation effect of gel and ferrofluid. So far magnetophoresis was studied by optical means, and limited to dilute magnetic fluids [3]. With our x-ray based technique [4], we are able to investigate magnetophoretic transport in any kind of magnetic fluid as well as in ferrogels.
Most recently, we were able to synthesize cobalt ferrite hydrogels [5]. These thermoreversible hydrogels have cubic and hexagonal mesophases which are tunable via the temperature. As a consequence, the magnetophoretic transport in different phases can be studied as a function of the viscoelasticity. For a further characterization of the samples, magnetometric and magneto-rheometric measurements have been carried out.

[1] G. Lattermann and M. Krekhova, Macromol. Rapid. Commun. 27. 1273 (2006) [2] C. Gollwitzer et al., Soft Matter 5, 2093 (2009) [3] A.S. Ivanov, A.F. Pshenichnikov, JMMM 322, 2575-2580 (2010) [4] R. Richter and J. Bläsing, Rev. Sci. Instrum. 72, 1729 (2001) [5] M. Krekhova et al., Langmuir (DOI: 10.1021/la1040823) (2010)

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