Wetting near Triple Points
نویسندگان
چکیده
The quartz microbalance technique has been used to study the coverage of argon and methane films in the vicinity of the bulk triple point. In contrast to previous measurements, close to the triple point, the discontinuities in the coverage indicate first-order surface phase transitions. A thermodynamic model shows that argon forms a layered solid-liquid film in a range around the triple point, but is liquid both above and below this range. Methane films make a transition directly from solid to liquid. These observations are examples of the rich phase behavior near bulk triple points predicted by Pandit and Fisher [Phys. Rev. Lett. 51, 772 (1983)]. [S0031-9007(97)04948-X]
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Threshold criterion for wetting at the triple point
Grand canonical simulations are used to calculate adsorption isotherms of various classical gases on alkali metal and Mg surfaces. Ab initio adsorption potentials and Lennard-Jones gas-gas interactions are used. Depending on the system, the resulting behavior can be nonwetting for all temperatures studied, complete wetting, or (in the intermediate case) exhibit a wetting transition. An unusual ...
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