Rheology and Microstructure of Concentrated Suspensions of Plate-Shaped Colloidal Particles
Jogun, Suzanne Michelle
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https://hdl.handle.net/2142/82448
Description
Title
Rheology and Microstructure of Concentrated Suspensions of Plate-Shaped Colloidal Particles
Author(s)
Jogun, Suzanne Michelle
Issue Date
1998
Doctoral Committee Chair(s)
Zukoski, Charles F.
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Language
eng
Abstract
The second type of clay particles have a smaller aspect ratio approximately equal to 8. These suspensions demonstrate shear thickening at $\phi \ge$ 0.50 and also have a shear history dependent elastic modulus, G$\sp\prime.$ In the shear thinning region G$\sp\prime$ decreases with increasing shear rate. In the shear thickening region the modulus increases rapidly. Since G$\sp\prime$ is related to particle alignment, these results imply that the particle alignment increases until thickening occurs. At that point the particles become highly misaligned. These alignment changes are confirmed by conductivity measurements.
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