Abstract |
Ultrasound in Interface Tension
Measurement
V.B.Akopyan (Protein Biosynthesis
Institute, Moscow, Russia)
e-mail:
akopyan@edunet.ru
A
lot of different techniques of the surface and interfacial tension measurement
are used in the basic researches and for solving a number of practical
problems. Almost every method is based on the interaction of the liquid surface
(or liquid-liquid interface) with a foreign solid body surface. The use of
ultrasound allows measuring the surface (interfacial) tension in the absence of
foreign bodys, low interfacial tension between two liquids etc. The method is
based on the well-known effect of button appearance in the surface of liquid
(or liquid-liquid interface) caused by radiation pressure. The direction of
convexity not always coincides with the direction of ultrasonic wave
propagation and depends on the difference between the energy densities at both sides
of the interface1. The measurement is convenient to realise by using the
deviation of a light ray reflected from the deformed interface. 1. Hertz G.,
Mende H., Der Schallstrahlungsdruck in Flussigkeiten, Zs. f. Phys., 1939, 114,
p.354.
Section
: 11