The multilayer melting transition in methane adsorbed on graphite |
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| Affiliation: | 1. Low Temperature Physics 63-37, California Institute of Technology, Pasadena, CA 91125, USA;1. Interdisciplinary Research Center for Hydrogen Technologies and Carbon Management (IRC – HTCM), King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;2. Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;3. Interdisciplinary Research Center for Refining and Advanced Chemicals (IRC – RAC), King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Weiyang, Xi’an, Shaanxi 710021, P.R. China;2. Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20 Hayashi-cho, Takamatsu-shi, 761-0396 Japan;1. Department of Chemical Engineering, A.C. Tech Campus, Anna University, Chennai-20, India;2. Department of Earth Resources Engineering, Kyushu University, Fukuoka 819-0395, Japan;1. The University of Western Australia, UWA Business School, 35 Stirling Highway, Crawley, WA, 6009, Australia;2. Charles Sturt University, School of Management & Marketing, Panorama Avenue, Bathurst, NSW, 2795, Australia;3. City University of Hong Kong, P7922, Academic 1, Department of Information Systems, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region |
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| Abstract: | ![]()
High resolution heat capacity measurements of multilayer methane adsorbed on graphite are presented and analyzed. The evidence indicates the presence of two wetting transitions: a first-order dewetting transition at Tw = 90.48 K, and a continuous wetting transition at the triple point, Tt = 90.66 K. This behavior is to be expected in connection with the melting transition in any system where both solid and liquid wet the surface. Heat capacity measurements can provide a valuable diagnostic tool for the wetting behavior of films too thick to be investigated by other means. In the thin film limit, we find that the latent heat of melting vanishes at about 4 layers. |
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