| Titre : | An inexpensive, digital instrument for surface tension, interfacial tension, and density determination (2008) |
| Auteurs : | Darren L. Williams, Auteur ; Casie L. Jupe, Auteur ; Karl D. Kuklenz, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 47 n°12, Juin 2008) |
| Article en page(s) : | p. 4286–4289 |
| Note générale : | Bibliogr. p. 4289 |
| Langues : | Anglais |
| Tags : | Digital ring tensiometer ; Carver press ; Water-recirculation bath |
| Résumé : | This article outlines the construction of a large-capacity, digital ring tensiometer, using common laboratory equipment, and reports the validation of this instrument against National Institutes of Science and Technology (NIST) data. A Carver press is used as a hydraulically controlled platform that raises and lowers the temperature-controlled jacketed flask that contains the test solutions. The upper platen of the press supports a four-decimal-place scale with a Pt−Ir ring hanging from the underscale hook. The scale measures the pull on the ring as the solution interface is lowered by the press. The force measurements are transferred to a personal computer (PC) via RS-232 communications. Temperature is controlled via a water-recirculation bath. The experimental surface tension measurements for toluene and water at 13 different temperatures were, on average, 2.7% larger than the NIST data. The 25 °C surface tension measurements for water, 2-butanone, ethyl ethanoate, and toluene were, on average, 1.1% larger than those calculated using the Hansen solubility parameters. |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie800211a |
