Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 245, Issue 1, Pages 142-162Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jcis.2001.8018
Keywords
dynanic surface tension; surface tension measurement; surfactant solutions; oscillating free surface jet; oscillating jet technique
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We develop a novel technique which deduces the surface tension in air of a fluid as a function of surface age, beginning at age zero. The technique utilizes pointwise measurements of perpendicular free surface profiles of a steady, oscillating jet corresponding to a discretization interval on the order of 0.1 ms. We implement the technique on constant-surface-tension test fluids (100% ethanol and 15% ethanol/85% water by, volume) to demonstrate the extent to which the technique can qualitatively capture that the surface tensions of these fluids are constant in time, and quantitatively produce values of these constants consistent with static measurements. We then implement the technique on jets of two agricultural surfactant mixtures, Triton X-405 and Triton X-100, and quantitatively deduce the decay, of surface tension as a function of surfactant concentration. (C) 2002 Elsevier Science.
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