Rheology of Concentrated Suspensions of Spheres. I. Effect of the Liquid-Solid Interface
MONSANTO RESEARCH CORP ST LOUIS MO
Pagination or Media Count:
A coaxial cylinder viscometer was used to measure the rheological behavior of concentrated suspensions of glass spheres in a nonpolar liquid Liquid polybutadiene, a polar liquid glycerol, and a liquid of medium polarity. The glass beads had untreated surfaces, surfaces with absorbed octylamine, or hydrophobic surfaces prepared by treating the surfaces with dimethyldichlorosilane. All the suspensions were Newtonian, except for the suspension of silane treated beads in glycerol which was pseudoplastic. Contact angle and sedimentation measurements indicate that the glycerol-silane treated beads system contained beads in an agglomerated state. The viscosities of the suspensions obey a Mooney type equation. In the Newtonian systems all the suspensions containing treated glass surfaces had lower relative viscosities than the analogous systems with untreated surfaces.
- Fluid Mechanics