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Updated: Jul 3, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
Shear thickening and scaling of the elastic modulus in a fractal colloidal system with attractive interactions
Chinedum O Osuji1, Chanjoong Kim, David A Weitz
1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. chinedum.osuji@yale.edu
Abstract:
Dilute oil dispersions of fractal carbon black particles with attractive van der Waals interactions display continuous shear thickening followed by shear thinning at high shear rates. The shear thickening transition occurs at gamma c approximately 10(2)-10(3) s(-1) and is driven by hydrodynamic breakup of clusters. Pre-shearing dispersions at shear rates gamma>gamma c produces enhanced-modulus gels where G' approximately sigma pre-shear 1.5-2 and is directly proportional to the residual stress in the gel measured at a fixed sample age. The observed data can be accounted for using a simple scaling model for the breakup of fractal clusters under shear stress.
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