Even in simple geometries, many complex fluids display nontrivial flow fields, with regions
where shear is concentrated. The possibility for such shear banding has been known for …

Single polymer dynamics offers a powerful approach to study molecular-level interactions
and dynamic microstructure in materials. Direct visualization of single polymer chains has …

We experimentally investigate the flow of hydrolyzed polyacrylamide (HPAM) solution with
and without salt in model porous media at high Weissenberg numbers (Wi> 1.0). The effect …

Many soft materials, including microgels, dense colloidal emulsions, star polymers, dense
packings of multilamellar vesicles, and textured morphologies of liquid crystals, share the …

The recent particle-tracking velocimetric (PTV) observations revealed that well-entangled
polymer solutions and melts tend to either exhibit wall slip or assume an inhomogeneous …

The current theoretical belief is that the steady-state shear banding in viscoelastic liquids
requires a non-monotonic constitutive relationship between shear stress and shear rate …

The present work discusses four types of new experiments that can improve the current
theoretical description of nonlinear rheology of entangled polymers. First, a slowly imposed …

We briefly review the recent advances in the rheology of entangled polymers and identify
emerging research trends and outstanding challenges, especially with respect to branched …

Transient and steady-state shear banding in a Laponite suspension were studied by particle
imaging velocimetry in Couette and cone and plate flow geometries on samples with varying …

We generalize our recent new ideas for the continuous startup shear rheology of entangled
polymer liquids in the transient stress overshoot regime to formulate a theory for the full …