Shear-banding phenomena and dynamical behavior in a Laponite suspension

by: F Ianni, R Di Leonardo, S Gentilini, G Ruocco

Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), Vol. 77, No. 3. (2008)

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摘要

Shear localization in an aqueous clay suspension of Laponite is investigated through dynamic light scattering, which provides access both to the dynamics of the system (homodyne mode) and to the local velocity profile (heterodyne mode). When shear bands form, a relaxation of the dynamics typical of a gel phase is observed in both bands soon after the flow stops. Periodic oscillations of the flow behavior, typical of a stick-slip phenomenon, are also observed when shear localization occurs. Both results are discussed in the light of various theoretical models for soft glassy gels.

@article{citeulike:2877892, abstract = {Shear localization in an aqueous clay suspension of Laponite is investigated through dynamic light scattering, which provides access both to the dynamics of the system (homodyne mode) and to the local velocity profile (heterodyne mode). When shear bands form, a relaxation of the dynamics typical of a gel phase is observed in both bands soon after the flow stops. Periodic oscillations of the flow behavior, typical of a stick-slip phenomenon, are also observed when shear localization occurs. Both results are discussed in the light of various theoretical models for soft glassy gels.}, author = {Ianni, F. and Di Leonardo, R. and Gentilini, S. and Ruocco, G. }, citeulike-article-id = {2877892}, doi = {http://dx.doi.org/10.1103/PhysRevE.77.031406}, journal = {Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)}, keywords = {2008, band, dls, grains, pre, shear}, number = {3}, posted-at = {2008-06-09 20:02:08}, priority = {2}, publisher = {APS}, title = {Shear-banding phenomena and dynamical behavior in a Laponite suspension}, url = {http://dx.doi.org/10.1103/PhysRevE.77.031406}, volume = {77}, year = {2008} }

RIS record

TY - JOUR ID - citeulike:2877892 L3 - citeulike-article-id:2877892 TI - Shear-banding phenomena and dynamical behavior in a Laponite suspension JF - Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) VL - 77 IS - 3 PB - APS N2 - Shear localization in an aqueous clay suspension of Laponite is investigated through dynamic light scattering, which provides access both to the dynamics of the system (homodyne mode) and to the local velocity profile (heterodyne mode). When shear bands form, a relaxation of the dynamics typical of a gel phase is observed in both bands soon after the flow stops. Periodic oscillations of the flow behavior, typical of a stick-slip phenomenon, are also observed when shear localization occurs. Both results are discussed in the light of various theoretical models for soft glassy gels. KW - 2008 KW - band KW - dls KW - grains KW - pre KW - shear AU - Ianni, F AU - Di Leonardo, R AU - Gentilini, S AU - Ruocco, G PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevE.77.031406 ER -

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