Directional converter arm method for surface and interfacial tension measurements with a top-loading balance

Citation
Sd. Christian et al., Directional converter arm method for surface and interfacial tension measurements with a top-loading balance, J COLL I SC, 214(2), 1999, pp. 224-230
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN journal
0021-9797 → ACNP
Volume
214
Issue
2
Year of publication
1999
Pages
224 - 230
Database
ISI
SICI code
0021-9797(19990615)214:2<224:DCAMFS>2.0.ZU;2-O
Abstract
A method is described for utilizing a top-loading balance, with a direction al converter arm, in vertical-pull surface force measurements. The Padday r od-pull technique, the du Nouy ring method, and the Wilhelmy plate method a re utilized with rods, thin-walled tubes, wire rings, and plates either rig idly attached to the converter arm or hanging freely from a hook at the end of the arm. The robustness, large weighing capacity, and accuracy of top-l oading balances make them ideally suited for a variety of types of surface and interfacial tension measurements. The converter arm method can be used with a stainless steel rod (3-7 mm in diameter) in vertical-pull surface te nsion measurements, with samples having volumes of only a few tenths of a m illiliter. Measurements on very small liquid volumes are feasible because t he rod is firmly attached to the converter arm rather than hanging freely a s in measurements with balances mounted above the sample; therefore, the ro d cannot swing toward and attach to the wall of small sample tubes. Automat ion of force and height measurements with the converter arm/top-loading bal ance method is straightforward. (C) 1999 Academic Press.