Interfacial rheological measurements often show in their nonlinear Lissajous-plots rhombus or saddle-like shapes indicating complex local deformation behaviour. A strong interacting silica particle and an almost not interacting clay particle were studied in respect to their interfacial rheological properties. Large amplitude oscillation shear measurements were performed with a bicone geometry and combined with optical measurements, from which particle tracks were calculated. A correlation was found between the appearance of shear localisation and Lissajous-plot shapes. Silica particles showed shear localisation at the bicone edge and rhombic plateaus in the Lissajous-plot, while the shear localisation for the clay particles was observed at the cup's wall as saddle-like shaped Lissajous-plots.
- nonlinear viscoelasticity
Birbaum, F. C., Haavisto, S., Koponen, A., Windhab, E. J., & Fischer, P. (2016). Shear localisation in interfacial particle layers and its influence on Lissajous-plots. Rheologica Acta, 55(4), 267-278. https://doi.org/10.1007/s00397-016-0912-0