A MODIFIED PENDANT DROP METHOD FOR TRANSIENT AND DYNAMIC INTERFACIAL-TENSION MEASUREMENT

Authors
TOUHAMI Y NEALE GH HORNOF V KHALFALAH H
Citation
Y. Touhami et al., A MODIFIED PENDANT DROP METHOD FOR TRANSIENT AND DYNAMIC INTERFACIAL-TENSION MEASUREMENT, Colloids and surfaces. A, Physicochemical and engineering aspects, 112(1), 1996, pp. 31-41
Citations number
42
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
112
Issue
1
Year of publication
1996
Pages
31 - 41
Database
ISI
SICI code
0927-7757(1996)112:1<31:AMPDMF>2.0.ZU;2-9
Abstract
An apparatus has been constructed based upon the drop shape method for the determination of surface and interfacial tensions. The system, bu ilt around a commercial pendant drop instrument, incorporates computer -based video image analysis. A user interface is designed and built ar ound the core subprograms. A filter routine using a global threshold i s used along with an edge-tracing algorithm for the extraction of the drop profile. The tension is calculated using the Jennings and Pallas algorithm. The time needed to digitize a single frame and to extract t he drop profile coordinates is about 0.5 s. The instrument is capable of measuring surface tension of water of 72.00 +/- 0.07 mN m(-1). The method is suitable for measuring transient as well as dynamic interfac ial tensions. The relaxation of surfactant adsorption layers at the oi l/water interfaces can also be inferred from the data obtained.