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Trends in Chemical Engineering   Volumes    Volume 6 
A comparison between the pendant drop, spinning drop and drop volume tensiometers for dynamic interfacial tension measurements
Graham H. Neale, Vladimir Hornof, Youssef Touhami
Pages: 155 - 164
Number of pages: 10
Trends in Chemical Engineering
Volume 6 

Copyright © 2000 Research Trends. All rights reserved


Interfacial tension is one of the most commonly used and most easily obtainable parameters for the characterization of liquid/liquid interfaces. In systems involving interfacial mass transfer and/or interfacial reaction, the interfacial tension is often dynamic (i.e., it depends on both time and location) and its measurement and interpretation pose a rather formidable problem. In this paper, the advantages and limitations of different methods for the measurement of dynamic interfacial tension of reactive systems are reviewed and examined. Dynamic interfacial tension values obtained by the pendant drop tensiometer were compared with those obtained by the spinning drop and the drop volume tensiometers for an immiscible, interfacially-reactive two phase system comprising paraffin oil acidified with linoleic acid, and aqueous solutions of sodium hydroxide. It was found that the pendant drop tensiometer and drop volume tensiometer give comparable tension data within moderate to high tension range. In the low-tension range, it was found that pendant drop tensiometer and spinning drop tensiometer yield comparable tension data.

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