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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Poster Session II - Complex Fluids and Perovskites

CPP 14.13: Poster

Tuesday, March 23, 2021, 16:30–18:30, CPPp

Rheological properties of clusters of supracolloidal magnetic polymers in a microchannel — •Ekaterina Novak¹, Vladimir Zverev¹, Marina Gupalo¹, and Sofia Kantorovich^1,2 — ¹Ural Federal University, Ekaterinburg, Russia — ²University of Vienna, Vienna, Austria

Construction of supracolloidal magnetic polymers (polymer-like structures in which magnetic nanoparticles are playing the role of monomers) has recently been made possible. The advantage of such magnetic polymers is that they keep their structure independently from the temperature and that is why they can be potentially used as an alternative to nanoparticles in magnetic fluids to obtain a desired and easily controlled magnetic or rheological response. In this contribution, using Langevin dynamics simulations, we focused on solutions of filaments, the magnetic nanoparticles in which are not only interacting via dipole-dipole potential but also via short-range attractive forces (Lennard-Jones type). Such filaments tend to aggregate in dense spherical droplet-like clusters. The resulting composite soft colloid is placed in the microchannel, where its behavior in the shear flow is investigated, varying a wide range of system parameters. We find that with time the cluster gets elongated. The higher is the shear rate the faster the flow can deform the cluster. The work was supported by RSF 19-72-10033.