![]() Polymers are generally power-law fluids that display a strong dependence of observed viscosity on rate of strain. Above the entanglement molecular weight J e 0 becomes constant, at the plateau shear compliance Below the entanglement molecular weight, J e 0 is observed to increase linearly with molecular weight. In terms of compliance, J(t), we consider a "recoverable shear compliance", J e 0, that reflects elastic behavior in the fluid. For polymeric fluids there is a finite storage modulus even when the material is well into the liquid state. If figure 5.15 showed a Newtonian fluid there would be no storage shear modulus, G, in the flow region (low-frequency regime). Hassager, "Dynamics of Polymeric Liquids", Vols 1 and 2, John Wiley and Sons (1977).Īt low frequency the storage shear modulus, G( w ), follows w 2. Ferry, "Viscoelastic Behavior of Polymers" Strobl, Chapter 5 "The Physics of Polymers, 2'nd Ed." Springer, NY, (1997). ![]() Anisotropic rheology and directional mechanotransduction in vascular endothelial cells. Cell locomotion and focal adhesions are regulated by substrate flexibility. Strain history dependence of the nonlinear stress response of fibrin and collagen networks. Intracellular stress tomography reveals stress focusing and structural anisotropy in cytoskeleton of living cells. Single cell mechanics: stress stiffening and kinematic hardening. Rapid stiffening of integrin receptor-actin linkages in endothelial cells stimulated with thrombin: a magnetic bead microrheology study. R., Hellerer, U., Essler, M., Aepfelbacher, M. Comparison of mathematical models for cat lung and viscoelastic balloon derived by Laplace transform methods from pressure-volume data. Time course and heterogeneity of contractile responses in cultured human airway smooth muscle cells. Mesenchymal stem cell mechanics from the attached to the suspended state. Power laws in microrheology experiments on living cells: comparative analysis and modeling. Probing the viscoelastic behavior of cultured airway smooth muscle cells with atomic force microscopy: stiffening induced by contractile agonist. Universal physical responses to stretch in the living cell. Pulmonary retention of primed neutrophils: a novel protective host response, which is impaired in the acute respiratory distress syndrome. Airway obstruction in asthma: does the response to a deep inspiration matter? Respir. Equibiaxial deformation-induced injury of alveolar epithelial cells in vitro. A model for cytoplasmic rheology consistent with magnetic twisting cytometry. Measurement of local viscoelasticity and forces in living cells by magnetic tweezers. Local measurements of viscoelastic parameters of adherent cell surfaces by magnetic bead microrheometry. A serial micropipette microfluidic device with applications to cancer cell repeated deformation studies. Weak ergodicity breaking and aging in disordered systems. Cytoskeletal remodelling and slow dynamics in the living cell. Linear and nonlinear rheology of living cells. ![]() Stiffness and prestress are closely associated in adherent contractile cells. ![]() Physical limits of cell migration: control by ECM space and nuclear deformation and tuning by proteolysis and traction force. Scaling the microrheology of living cells. ![]()
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