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      Stabilization mechanism and chemical demulsification of water-in-oil and oil-in-water emulsions in petroleum industry: A review

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          Force measurements with the atomic force microscope: Technique, interpretation and applications

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            Measurement of surface and interfacial tension using pendant drop tensiometry.

            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 connected with both Bond number (the balance between interfacial tension and gravitational forces) and drop volume. Here, we discuss the process involved with going from a captured experimental image to a fitted interfacial tension value, highlighting pertinent features and limitations along the way. We introduce a new parameter, the Worthington number, Wo, to characterise the measurement precision. A fully functional, open-source acquisition and fitting software is provided to enable the reader to test and develop the technique further.
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              In-situ heavy and extra-heavy oil recovery: A review

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                Author and article information

                Contributors
                Journal
                Fuel
                Fuel
                Elsevier BV
                00162361
                February 2021
                February 2021
                : 286
                : 119390
                Article
                10.1016/j.fuel.2020.119390
                32da6ec1-53f7-4b79-a554-b3e10f56cc09
                © 2021

                https://www.elsevier.com/tdm/userlicense/1.0/

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