Shear banding and yield stress in soft glassy materials

@article{citeulike:2874103, abstract = {Shear localization is a generic feature of flows in yield stress fluids and soft glassy materials but is incompletely understood. In the classical picture of yield stress fluids, shear banding happens because of a stress heterogeneity. Using recent developments in magnetic resonance imaging velocimetry, we show here for a colloidal gel that even in a homogeneous stress situation shear banding occurs, and that the width of the flowing band is uniquely determined by the macroscopically imposed shear rate rather than the stress. We present a simple physical model for flow of the gel showing that shear banding (localization) is a flow instability that is intrinsic to the material, and confirm the model predictions for our system using rheology and light scattering.}, author = {Ller, M\o P. C. F. and Rodts, S. and Michels, M. A. J. and Bonn, Daniel }, citeulike-article-id = {2874103}, doi = {http://dx.doi.org/10.1103/PhysRevE.77.041507}, journal = {Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)}, keywords = {colloidal-gel, rheology, shear}, number = {4}, posted-at = {2008-07-01 17:30:51}, priority = {2}, publisher = {APS}, title = {Shear banding and yield stress in soft glassy materials}, url = {http://dx.doi.org/10.1103/PhysRevE.77.041507}, volume = {77}, year = {2008} }

TY - JOUR ID - citeulike:2874103 L3 - citeulike-article-id:2874103 TI - Shear banding and yield stress in soft glassy materials JF - Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) VL - 77 IS - 4 PB - APS N2 - Shear localization is a generic feature of flows in yield stress fluids and soft glassy materials but is incompletely understood. In the classical picture of yield stress fluids, shear banding happens because of a stress heterogeneity. Using recent developments in magnetic resonance imaging velocimetry, we show here for a colloidal gel that even in a homogeneous stress situation shear banding occurs, and that the width of the flowing band is uniquely determined by the macroscopically imposed shear rate rather than the stress. We present a simple physical model for flow of the gel showing that shear banding (localization) is a flow instability that is intrinsic to the material, and confirm the model predictions for our system using rheology and light scattering. KW - colloidal-gel KW - rheology KW - shear AU - Ller, M\o AU - Rodts, S AU - Michels, MAJ AU - Bonn, Daniel PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevE.77.041507 ER -