Measurement of surface and interfacial tension using pendant drop tensiometry
Joseph D Berry, Michael J Neeson, Raymond R Dagastine, Derek YC Chan, Rico F Tabor
JOURNAL OF COLLOID AND INTERFACE SCIENCE | ACADEMIC PRESS INC ELSEVIER SCIENCE | Published : 2015
Pendant drop tensiometry offers a simple and elegant solution to determining surface and interfacial tension - a central parameter in many colloidal systems including emulsions, foams and wetting phenomena. The technique involves the acquisition of a silhouette of an axisymmetric fluid droplet, and iterative fitting of the Young-Laplace equation that balances gravitational deformation of the drop with the restorative interfacial tension. Since the advent of high-quality digital cameras and desktop computers, this process has been automated with high speed and precision. However, despite its beguiling simplicity, there are complications and limitations that accompany pendant drop tensiometry ..View full abstract
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Awarded by Australian Research Council
This work was supported in part by the Australian Research Council through a Discovery Project Grant (DP140100677). MJN acknowledges funding from the David Hay Postgraduate Award. The Particulate Fluids Processing Centre, University of Melbourne is thanked for infrastructure support. We are indebted to the many students who have patiently assisted with beta-testing the software in the course of their experiments.