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Controlled drop tensiometer for measuring dynamic interfacial and film tension
Author(s) -
Nagarajan R.,
Koczo Kalman,
Erdos Elemer,
Wasan Darsh T.
Publication year - 1995
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690410418
Subject(s) - surface tension , tensiometer (surface tension) , pulmonary surfactant , drop (telecommunication) , rheology , pressure drop , maximum bubble pressure method , materials science , adsorption , diffusion , chemistry , thermodynamics , mechanics , chemical engineering , composite material , mechanical engineering , engineering , biochemistry , physics
A dynamic interfacial tensiometer described measures the tension of stressed liquid‐liquid interfaces. In this accurate and controlled method, the time‐dependent pressure difference across the curved interface of a spherical drop, immersed in a second immiscible phase, is measured as a function of time. Dynamic experiments are conducted by varying the drop size, therby stressing the interface. The technique is eminently suited for the measurement of static and dynamic interfacial tensions, the study of the diffusion, adsorption, and desorption kinetics of surfactants, and the rheological behavior of liquid films. These capabilities are demonstrated for n‐dodecane contacted with an aqueous solution of a nonionic surfactant. To explain the phenomena, diffusion models are developed that compare well with the experimental data. The noninvasiveness and versatility make this instrument a useful tool.