Real-Time Pendant Drop Tensiometer Using Image Processing with Interfacial Area and Interfacial Tension Control Capabilities
✍ Scribed by G. Faour; M. Grimaldi; J. Richou; A. Bois
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 171 KB
- Volume
- 181
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
where g is the interfacial tension; r 1 , r 2 are the radius of Among different methods used for the measurement of interfacurvature in two perpendicular directions; and Dp is the cial tension, the pendant drop is particularly well adapted to liqhydrostatic pressure difference between both sides of the uid-liquid interfaces. Using an integrated form of Laplace's equainterface. It should be noted that the interfacial tension repretion, we have developed an automatic pendant drop tensiometer sents the energy of the intermolecular cohesion forces by which allows a real-time measurement (i.e., three to five measureunit area: g is in N/m or J/m 2 . ments per second) with an accuracy less than 0.1%. The very
The shape of the drop depends on the balance between new feature of this tensiometer is the possibility of controlling the the gravity forces, which tend to elongate the drop, and interfacial area and the interfacial tension during an experiment the interfacial tension, which minimizes the surface of the for the study of (i) adsorption processes at constant area or tension and (ii) the dynamical properties of the Marangoni effect for ad-interface and tends to make the drop spherical. The profile sorbed layers.