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BP: Fachverband Biologische Physik

BP 18: Biomaterials and Biopolymers (joint session BP/CPP)

BP 18.5: Talk

Wednesday, March 20, 2024, 10:45–11:00, H 1028

Strain-Controlled Critical Slowing Down in the Rheology of Disordered Networks — •Abhinav Sharma1,2, Jordan Shivers3, and Fred MacKintosh31Mathematisch-Naturwissenschaftlich-Technische Fakultät, Universität Augsburg, 86159 Augsburg — 2Leibniz Institute für Polymerforschung, Dresden — 3Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, USA

Networks and dense suspensions frequently reside near a boundary between soft (or fluidlike) and rigid (or solidlike) regimes. Transitions between these regimes can be driven by changes in structure, density, or applied stress or strain. In general, near the onset or loss of rigidity in these systems, dissipation-limiting heterogeneous nonaffine rearrangements dominate the macroscopic viscoelastic response, giving rise to diverging relaxation times and power-law rheology. Here, we describe a simple quantitative relationship between nonaffinity and the excess viscosity. We test this nonaffinity-viscosity relationship computation- ally and demonstrate its rheological consequences in simulations of strained filament networks and dense suspensions. We also predict critical signatures in the rheology of semiflexible and stiff biopolymer networks near the strain stiffening transition.

Keywords: Biopolymers; Rheology; Criticality; Nonaffine

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