Abstract
Thoria sols transform from low viscosity, Newtonian fluids to pseudo-plastic, thixotropic gels with increasing pH, time, and uranium concentration. Shear stress versus shear rate curves demonstrating this transformation have been generated. Electron microscopy of freeze-fractured samples with known viscosities has been used to show that the change in viscosity is accompanied by a structured transformation, from a random network of thoria particles to grains containing a textured rod-like lattice. It is suggested that the viscosity increases are due to increased mechanical interaction between the gelled rods.
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