Adsorption Effect on Wetting in a Copper/Lead Systemстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 28 июня 2016 г.
Аннотация:Complex analysis of interfacial thermodynamics was performed
for a lead−copper binary system. Contact angle on polycrystalline copper and
surface tension was measured for saturated Pb−Cu alloys at 390−1000 and
390−800 °C temperature ranges correspondingly. Liquid−gas and interfacial
solid−liquid energies were calculated for Pb−Cu binary system by statistical
thermodynamics on the basis of regular solution approximation at 390−950 °C.
Calculated values coincide well with measured ones and with literature data,
except for the temperature region lower than 700 °C, where the reported values
of interfacial energy seem to be overestimated. Analysis of literature data leads
us to the conclusion that an adsorbed monolayer film of lead exists in
equilibrium with Pb−Cu drop on copper/gas interface between 250 and 900
°C. The decrease of the solid/gas surface energy due to Pb adsorption was
calculated on the basis of the Young equation and fitted with the Szyszkowski
equation. An adsorption energy of 276 kJ/mol and a vibration period of 2.79 ×
10−14 s−1 were found.