Small- and large-amplitude oscillatory rheometry with bead–spring dumbbells in Stokesian Dynamics to mimic viscoelasticity

Large amplitude oscillatory microrheology

Single polymer dynamics under large amplitude oscillatory extension

Yuecheng Zhou1 and Charles M. Schroeder1,2,3,* 1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA 2Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA 3Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, I...

Modeling hydrodynamic self-propulsion with Stokesian Dynamics. Or teaching Stokesian Dynamics to swim

We develop a general framework for modeling the hydrodynamic self-propulsion (i.e., swimming) of bodies (e.g., microorganisms) at low Reynolds number via Stokesian Dynamics simulations. The swimming body is composed of many spherical particles constrained to form an assembly that deforms via relative motion of its constituent particles. The resistance tensor describing the hydrodynamic interact...

Transient and Average Unsteady Dynamics of Single Polymers in Large-Amplitude Oscillatory Extension

Oscillatory rheometry has been widely used in bulk rheological measurements of complex fluids such as polymer solutions and melts. Despite recent progress on bulk oscillatory rheology, however, the vast majority of single polymer studies has focused on chain dynamics in simple on/ off step strain-rate experiments. In order to fully understand dynamic polymer microstructure and to establish conn...

Dynamics of melting and recrystallization in a polymeric micellar crystal subjected to large amplitude oscillatory shear flow.

Shear-induced structural transitions of a micellar cubic phase during large amplitude oscillatory shear flow is studied with time-resolved oscillatory rheological small angle neutron scattering. This technique allows us to resolve the structural changes within a cycle of oscillation. By applying a strain rate near the critical melting shear rate, melting and recrystallization occurs in a cyclic...