Rheological behaviour of dilute suspensions of platelet particles

The rheological behaviour of Newtonian suspensions of platelets with an asp ect ratio ranging from 0.006 to 0.2 is studied in this work. Using model pa rticles to correlate the aspect ratios square-shaped particles with their s edimentation behaviour, the results obtained were used to estimate the aver age aspect ratio of mica particles. A comparison is made between the aspect ratio measured by sedimentation experiments and that determined from the r heological behaviour of dilute suspensions. Their good agreement shows that the average aspect ratio of a polydispersed suspension of platelets estima ted using packing experiments correlates well with the apparent aspect rati o given by the intrinsic viscosity of the suspension.