ABSTRACT The analysis of sedimentation or flotation (creaming) by detecting the transmission profile over the entire sample height in an analytical centrifuge (using a Stability Analyzer) is described and illustrated for a diverse range of practical dispersions and emulsions. It is also illustrated how to use extrapolated results to estimate dispersion shelf life stability for samples in a gravitational field. Formulation optimization, such as choosing appropriate surfactant levels, is also shown to be a practical application of such methods. ACKNOWLEDGMENT The author thanks Mr. D. Frömer, Mr. St. Küchler, and Mr. T. Sobisch for their support and different companies for providing samples for analysis. This study was supported in part by a grand of the German BMiWi (Project Sedi-Reader 475/99).
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D. Lerche (2002) studied this question.
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