Abstract
A series of polyacrylamide/laponite nanoparticle suspensions were prepared via solution mixing and the effects of nanoparticle content, polymer concentration and molecular weight, and water temperature, pH, and salinity on their rheological behavior were investigated using a concentric cylinder dynamic rheometer. Rheological investigation showed that the polyacrylamide and polyacrylamide/laponite suspensions displayed non-Newtonian behavior in almost the whole range of shear rate. At low shear rates, the shear viscosity and shear stress was increased with addition of the laponite. At higher polymer concentration, the suspension shear viscosity and stress were less sensitive to laponite concentrations. The viscosities of the polyacrylamide/laponite suspensions were comparable to those of the neat polyacrylamide solution at higher shear rates. The flow curves indicated the shear viscosity and stress of the samples were increased with increasing polyacrylamide concentration and molecular weight, but were decreased with increasing salinity, temperature, and pH of water.
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