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IRTG / Soft Matter Science
Freiburger Materialforschungszentrum
Stefan-Meier-Str. 21
79104 Freiburg, Germany

Contact: Jana Husse

+49 761 203 678 34
softmattergraduate[at]uni-freiburg.de


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You are here: Home Events PD Dr. Andreas Menzel "Mesoscopic modeling of magnetic gels"

PD Dr. Andreas Menzel "Mesoscopic modeling of magnetic gels"

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Heinrich-Heine-Universität Düsseldorf, Institut für Theoretische Physik II: Weiche Materie, Germany

What
  • Seminar
When Nov 05, 2015
from 02:15 PM to 03:00 PM
Where Seminarraum A, FMF, Stefan-Meier-Str. 21, Freiburg
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Magnetic gels are generated by embedding assemblies of colloidal magnetic particles into a permanent, possibly swollen elastic polymer matrix [1]. Other terms referring to materials of this type are ferrogels or magnetorheological elastomers. A major interest for this type of materials arises from the fact that, during operation, their properties can readily and reversibly be tuned and switched from outside by external magnetic fields.

We mainly use two types of approaches to characterize these features. On the one hand, simple dipole-spring models reproduce and explain the experimentally observed reversible tunability of the elastic moduli [2,3]. As it turns out, these effects strongly depend on the particle arrangement within the elastic matrix. Likewise, we investigate the tunability of the dynamic behavior [4]. On the other hand, we employ continuum elasticity theory to reveal and analyze switchable nonlinear stress-strain properties [5].

Our mesoscopic approaches resolve individual magnetic colloidal particles, but treat the elastic matrix as an effective elastic background. We have taken first steps to derive our mesoscopic models by coarse-graining from more microscopic descriptions that resolve the presence of individual fluctuating polymer chains [6]. In addition to that, we aim at connecting our mesoscopic level to existing macroscopic continuum approaches [7].


[1] A. M. Menzel, Phys. Rep. 554, 1 (2015).
[2] M. A. Annunziata, A. M. Menzel, and H. Löwen, J. Chem. Phys. 138, 204906 (2013).
[3] G. Pessot, P. Cremer, D. Y. Borin, S. Odenbach, H. Löwen, and A. M. Menzel, J. Chem. Phys. 141, 124904 (2014).
[4] M. Tarama, P. Cremer, D. Y. Borin, S. Odenbach, H. Löwen, and A. M. Menzel, Phys. Rev. E 90, 042311 (2014).
[5] P. Cremer, H. Löwen, and A. M. Menzel, arxiv:1508.00770 (2015).
[6] G. Pessot, R. Weeber, C. Holm, H. Löwen, and A. M. Menzel, J. Phys.: Condens. Matter 27, 325105 (2015).
[7] A. M. Menzel, J. Chem. Phys. 141, 194907 (2014).


 

 

invited by PD Dr. Falko Ziebert

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