SKM 2021 – wissenschaftliches Programm
CPP 6.6: Poster
Dienstag, 28. September 2021, 17:30–19:30, P
Rotating spherical particle in a continuous viscoelastic medium — a microrheological example situation — •Sonja K. Richter, Claudius D. Deters, and Andreas M. Menzel — Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany
We consider rigid spherical particles in a continuous one-component viscoelastic environment that are subject to an external dynamic torque. A dynamic relaxation parameter quantifies the deformational memory of the embedding material. Consequently we can interpolate between damped reversible deformation dynamics and net terminal flow of the viscoelastic surroundings using the same formalism . On this basis, we determine the dynamic linear response function for particle rotations that are driven by the external torque under no-slip conditions on the particle surface . Specifically, we derive explicit expressions for the induced deformation and flow fields in the surrounding viscoelastic medium. To link to magnetic microrheology, we address magnetically anisotropic particles that are driven by a dynamic external magnetic field. Corresponding magnetic susceptibility functions are evaluated . Overall, we expect that our results will be important in the context of microrheological measurements on soft and biological viscoelastic matter.
 M. Puljiz, A. M. Menzel, Phys. Rev. E 99, 012601 (2019).
 S. K. Richter, C. D. Deters, A. M. Menzel, EPL (Europhys. Lett.), accepted.