L1 /
3
CH1012
RHEOLOGY
Rheology - the science concerned with the flow and / or deformation of matter.
eg. viscosity (flows /
ceases - simple liquids)
Colloidal
systems
• Viscosity higher than the pure medium due to hydrodynamic (finite particle volume in liquid) & interparticle (attr.,
rep., contact) effects.
• in high concentration colloids the viscosity may change with the strength and rate of the applied shearing
stress (Force/area)
eg.
non-drip paints - to stir
quickly is
hard, stir slowly no problems.
hard, stir slowly no problems.
