Stability and Separation Behavior of Concentrated or Diluted Dispersions

“Stable or Unstable”, that is often the question asked in the daily production quality control (e.g. for pigment suspensions, agro-chemical emulsions) as well as in R&D departments dealing with new additives or formulations. The definition of the meaning of stability depends very much on the customer requirements for a given product. In general, “stable” may be described as the quality of being free from change or variation (at least for a given time period).  If we are dealing with disperse systems, such as suspensions or emulsions, instability phenomena are, on the one hand directly related to a possible migration of particles, or on the other hand, to changes in particle size distribution followed by particle migration. A reliable prediction of the stability behavior of new products under development, or actual processed products for the market, over a period of months or even a year would essentially shorten the development cycles and increase the trust of customers in the products. After a short description of direct and indirect analytical methods to assess the stability behavior of disperse systems, we centre on the new analytical centrifuge LUMiFuge 114. The LUMiFuge permits .............................

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