Interactions between Talc Particles and Water and Organic Solvents

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

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 807 KB
• Volume: 194
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5103

✦ Synopsis

The contact angle method has been used to characterize Three talc samples have been studied by adsorption and immerthe surface intensive properties of solids. Indeed, the contact sion methods after a classical characterization of their properties. angle between a drop of a liquid probe and the solid surface The combination of adsorption isotherms and of immersion meastudied is linked to solid/liquid, solid/vapor, and liquid/ surements allows the calculation of enthalpies and entropies of vapor interfacial tensions through Young's equation: adhesion. The studied talcs are characterized as ''middle energy'' solids. The differences between the particle shapes of the different samples are shown to be of great importance, indicating a linkage g LV cos u Å g SL 0 g SV .

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between cristallinity and surface properties. The whole results are explained by the influence of intermolecular forces such as acid-

Unfortunately, the use of this equation is limited because base interactions in the interfacial layer.