Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 46: Poster Session: Complex Fluids, Soft Matter, Active Matter, Glasses and Granular Materials
DY 46.5: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P2
Rheological properties of Stcokmayer supracolloidal magnetic polymers under shear flow — •Vladimir Zverev1, Ekaterina Novak1, and Ivan Novikau2 — 1UNIVIE, Vienna, Austria — 2Ekaterinburg, Russia
Supracolloidal magnetic polymers (SPMs) are polymer-like structures in which magnetic nanoparticles Construction SPMs has recently been made possible. Their advantage is that they keep their structure independently from the temperature. SPMs can be potentially used as an alternative to nanoparticles in magnetic fluids to obtain a desired and easily controlled magnetic or rheological response.
We assume SMPs formed by monodisperse magnetic colloids, modeled as identical spherical beads. We consider SMPs of four different topologies: chain-, Y-, X- and ring-like ones. Using Langevin dynamics simulations, we pay our attention to solutions of filaments, the magnetic nanoparticles in which are not only interacting via dipole-dipole potential but also via short-range attractive forces (Van der Waals force). 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 under influence of an external field is investigated, varying a wide range of system parameters. It was found that clusters can demonstrate oscillating in time magnetic response and complex mutual infulence of the flow and the magnetic field.
The work was supported by RSF 19-72-10033.