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Determination of coalescence stability of emulsions by analytical ultracentrifugation under separation of dispersed phase

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Progress in Analytical Ultracentrifugation

Part of the book series: Progress in Colloid & Polymer Science ((PROGCOLLOID,volume 86))

Abstract

A centrifugal method for determining the coalescence stability of emulsions by analytical ultracentrifugation under separation of dispersed phase is described. The non-kinetically oriented method involves demulsification up to constant heights (final values) of all the layers. It can be performed in various variants including stepwise centrifugation that provides several final values during one run. On this basis, coalescence pressures are calculated as a measure of coalescence stability. The results obtained are in agreement with the expected behavior of the emulsions. In the case of SDS stabilized n-decane-in-water emulsions without electrolyte four layers are obtained that exist only during centrifugation under a sufficient centrifugal force, but not under gravity. A proof is given of a pressure barrier at the transition of the non-transparent to the transparent emulsion. The possible influence of the particle size on the coalescence pressures is discussed.

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Author information

Author notes

  1. A. Seifert

    Present address: Central Institute of Nutrition, Potsdam-Rehbrücke, FRG

Authors and Affiliations

  1. Central Institute of Physical Chemistry, Berlin-Adlershof, FRG

    K. Strenge & A. Seifert

  2. Zentralinstitut für Ernährung AG Lebensmittelchemie, Arthur-Scheunert-Allee 114-116, O-1505, Bergholz-Rehbrücke, FRG

    A. Seifert

Authors
  1. K. Strenge
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  2. A. Seifert
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W. Borchard

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© 1991 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG

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Strenge, K., Seifert, A. (1991). Determination of coalescence stability of emulsions by analytical ultracentrifugation under separation of dispersed phase. In: Borchard, W. (eds) Progress in Analytical Ultracentrifugation. Progress in Colloid & Polymer Science, vol 86. Steinkopff. https://doi.org/10.1007/BFb0115010

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  • DOI: https://doi.org/10.1007/BFb0115010

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  • Publisher Name: Steinkopff

  • Print ISBN: 978-3-7985-0910-8

  • Online ISBN: 978-3-7985-1683-0

  • eBook Packages: Springer Book Archive

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