Reversible shear thickening in monodisperse and bidisperse colloidal dispersions
作者:
Jonathan Bender,
Norman J. Wagner,
期刊:
Journal of Rheology
(AIP Available online 1996)
卷期:
Volume 40,
issue 5
页码: 899-916
ISSN:0148-6055
年代: 1996
DOI:10.1122/1.550767
出版商: The Society of Rheology
关键词: Shear thickening, reversible;Colloidal dispersions;Clusters;Dichroism;Stress‐optical law;COLLOIDS;DISPERSIONS;SHEAR PROPERTIES;SILICA;TURBIDITY;DICHROISM;SCALING LAWS;SUSPENSIONS
数据来源: AIP
摘要:
Reversible shear thickening is measured in model colloidal suspensions of silica that exhibit near hard‐sphere behavior. Flow dichroism measurements and the colloidal stress‐optical relationship prove that hydrodynamic interactions drive the shear thickening transition. Turbidity and flow‐small angle neutron scattering (flow‐SANS) demonstrate that particles cluster reversibly in the shear thickened state. Further, SANS measurements show that shear thickening occurs without any shear‐induced order‐disorder transition, in contrast to observations for dispersions of charged colloids. A simple force balance predicts the scaling of the critical stress for the onset of shear thickening with particle size and volume fraction. Measurements on bimodal mixtures verify the scaling laws derived from the force balance and provide a strategy for controlling the shear thickening transition.
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