Oscillating pendant drop: A method for the measurement of dynamic surface and interface tension
1986; American Institute of Physics; Volume: 57; Issue: 2 Linguagem: Inglês
10.1063/1.1138925
ISSN1527-2400
Autores Tópico(s)Electrowetting and Microfluidic Technologies
ResumoA method is described for measuring dynamic surface and interface tension. The technique is essentially a variation of the pendant drop method in which the drop is allowed to oscillate after sudden formation at the tip of a syringe. Immediately after the oscillation stops but before the drop detaches, there is an instant of rest. At this moment, the profile of the drop is obtained using high-speed photography. The boundary tension is then calculated from the profile using established methods. The technique is demonstrated on systems consisting of aqueous solutions of sodium stearate or oleate on one hand and mineral oil or air on the other hand. Surface or interface tensions may be obtained within 0.25 to 5 s after surface formation.
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