Publication de 4 numéros par an
ISSN Imprimer: 0276-1459
ISSN En ligne: 1943-6181
Indexed in
STUDY ON A MECHANICAL EQUILIBRIUM CONDITION AT A THREE-PHASE CONTACT LINE: WETTABILITY ON SOLID SURFACES
RÉSUMÉ
Young's equation describes an interfacial equilibrium condition at a contact line of a liquid droplet on a smooth solid surface. This relation was derived by Thomas Young in 1805 and has been examined continuously up to the present. This equation is generally discussed from a thermodynamic viewpoint and is derived by minimizing the total free energy of a system while keeping constant the intensive parameters in the total free energy. In our previous study [Yonemoto, Y. and Kunugi, T., (2009) J. Chem. Phys., 130, pp. 144106-1-144106-12], a modified Young's equation was derived based on a new thermodynamic approach. In this derivation, the virtual work variation in a droplet on a smooth solid surface was considered at the contact line by taking the incline of the droplet surface into account. An analytical solution derived from the modified Young's equation can predict some experimental data for the relationship between the droplet radius and the contact angle. In the present work, we consider the Zisman's plot based on a macroscopic concept. In concrete terms, a modified Zisman's function is derived from the modified Young's equation. Finally, we compared the modified Zisman's function to experimental data for the relationship between liquid surface tension and the contact angle.
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