ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A fully automated and computer controlled apparatus is described that measures the interfacial tension (IFT) of fluid interfaces and the film tension of liquid films. The fluid interface is formed as a nearly spherical drop at the tip of a capillary which is immersed into another immiscible fluid. The size of the interface is controlled and measured by controlling the size of the drop and the capillary pressure is monitored by a sensitive pressure transducer. The interfacial tension is calculated by the Young–Laplace equation. The drop at the capillary tip can also be covered with a cap shaped liquid film and then the film area can be controlled and the film tension measured. This apparatus is useful for measuring equilibrium interfacial tension or film tension, the adsorption kinetics by stress relaxation experiment and the dynamic interfacial tension or dynamic film tension under both interface expansion or contraction conditions. The capabilities of this versatile, automatic instrument are illustrated with typical experimental results.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1145203
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