Observations of colloidal states using ultrasound velocity measurements

The following systems are discussed from the point of view of the utilisation of ultrasound velocity scanning to understand the behaviour of concentrated colloidal systems: the sedimentation behaviour of well defined monodisperse silica latex particles in a non-aqueous continuous phase, where long range repulsive interactions result in ordering in the sediment and formation of a colloidal crystal state; and the sedimentation and consolidation behaviour of a concentrated industrial suspension of organic particulates in both the stable and the flocculated state