Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 5: Polymer Networks and Dynamics I: Elastomers and Magnetic Materials
CPP 5.4: Vortrag
Montag, 20. März 2017, 11:15–11:30, ZEU 255
Force-induced matrix-mediated interactions between rigid inclusions in elastic media — Mate Puljiz1, Shilin Huang2, Günter K. Auernhammer2, and •Andreas M. Menzel1 — 1Heinrich Heine University Düsseldorf, Düsseldorf, Germany — 2Max Planck Institute for Polymer Research, Mainz, Germany
The situation of forces acting on rigid inclusions in elastic matrix environments is addressed. These forces can be imposed from outside, or they are induced between the inclusions, if, for example, external electric or magnetic fields generate interacting electric or magnetic moments in the inclusions. Resulting translations of the inclusions distort the embedding elastic matrix, which gives rise to long-ranged matrix-mediated interactions between the inclusions.
We demonstrate that these induced interactions can be calculated analytically in the case of rigid spherical inclusions [1]. For this purpose, a formalism used to capture hydrodynamic interactions between particles in colloidal suspensions [2] is adapted to the situation of an elastic environment. Experiments on rigid magnetic particles in a soft elastic gel matrix confirm our approach [1]. The description is readily extended to include induced torques [3].
Our results will be important in the future to characterize, for instance, the external tunability of mechanical properties in electric or magnetic composite materials, and for microrheological applications.
[1] Puljiz et al., Phys. Rev. Lett. (accepted, 2016).
[2] Dhont, An Introduction to Dynamics of Colloids (Elsevier, 1996).
[3] Puljiz et al., arXiv preprint arXiv:1611.08823 (2016).