Abstract
The nonlinear viscoelastic behavior of colloidal systems is studied experimentally. Model systems are used that consist of carbon black particles, dispersed in mineral oil. The experimental techniques include dynamic measurements, steady state shear viscosity and normal force, parallel superposition, and nonlinear relaxation. The data are expressed in rate‐dependent spectra. The effect of shear on the spectra is compared with available results for polymeric systems. After cessation of flow a thixotropic recovery takes place in the dispersions. This recovery has been followed by measuring the changing relaxation spectrum. The effect of shear and time on the spectrum is discussed in terms of the variable, colloidal structure. The applicability of a modified bead‐spring model where the springs can be reversibly broken down is considered.
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