✦ LIBER ✦

Contact Angle and Film Pressure: Study of a Talc Surface

✍ Scribed by J.M. Douillard; J. Zajac; H. Malandrini; F. Clauss

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 236 KB
Volume: 255
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.2002.8611

No coin nor oath required. For personal study only.

✦ Synopsis

Talc samples in both sheet and powder form are studied by adsorption calorimetry and adsorption isotherm techniques. A model is used to determine the solid surface energy, the solid surface tension and the dispersive, acidic, and basic components of these terms. These results are introduced in an approximate equation relating adsorption to contact angle data. Experimental contact angles are in correct agreement with this approach. The Neumann equation of state is used to fit the data and discussed. It appears as a numerical form of the general equation taking into account gas adsorption and film pressure. Behaviors of talc in contact with liquids do not appear very different whether the solid is in sheet or powder form.

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