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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: Hydrogels and Microgels
CPP 34.3: Talk
Thursday, September 8, 2022, 10:00–10:15, H39
Behaviour of a magnetic nanogel in a shear flow — •Ivan Novikau1, Ekaterina Novak2, Elena Pyanzina2, and Sofia Kantorovich1,2 — 1University of Vienna, Austria — 2Russia
Magnetic nanogels (MNG) are promising magneto-controllable drug carriers. In order to develop this potential, one needs to study MNG's behavior in various microfluidic systems, one of which can be modelled as a channel with a given flow.
Considering the size of the MNG and typical time and velocity scales involved in their nanofluidics, experimental characterisation of the system is challenging. In this work, we perform molecular dynamics (MD) simulations combined with the Lattice-Boltzmann (LB) scheme aiming at describing the impact of the shear rate on the shape, magnetic structure and motion of an MNG.
We find that in a shear flow, the centre of mass of an MNG tends to be in the centre of a channel and to move, preserving the distance to both walls. The MNG monomers along with translation are involved in two more types of motion, they rotate around the centre of mass and oscillate with respect to the latter. It results in synchronised tumbling and wobbling of the whole MNG accompanied by its volume oscillates. We show that the volume oscillations and rotations are two faces of the same periodic process whose frequency is a growing function of the shear rate and depends on strength of magnetic interaction between magnetic nanoparticles. We demonstrate that the oscillations of the volume lead to the periodic changes in MNG magnetic energy.