4.7 Article

Measurement of the surface and interfacial tension from maximum volume of a pendant drop

期刊

JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 244, 期 1, 页码 113-122

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jcis.2001.7916

关键词

pendant drops; maximum drop volume; drop profile; drop correction factor; surface and interfacial tension

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Described herein is a two-phase nonempirical method for the determination of surface or interfacial tension of stationary systems that also allows the determination of drop correction factor. The method is based on the theoretical calculation of the drop profile associated with the maximum volume of a pendant drop on a cylindrical capillary. The capillary constant and the drop correction factor are calculated from measured maximum drop volume. The accuracy and the reproducibility of the method are demonstrated by comparison of surface tension data obtained for bidistilled water, ethanol, n-hexane, and toluene with values resulting from independent reference measurements using sphere tensiometry, cylinder tensiometry, and the drop detachment method. For measurements of the interfacial tension of 1-octanol versus water, drop detachment and sphere tensiometry were used as reference techniques. The drop correction factors are compared with the values calculated by polynomial approximation of the drop correction factor function f(r/v(f)(1/3)) introduced by W D. Harkins and F: E. Brown (C) 2001 academic Press.

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