Measuring Contact Angles at Copper Electrodes |
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Authors: | Batrakov V. V. Makarov A. G. |
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Affiliation: | (1) Moscow State Pedagogical University, ul. Malaya Pirogovskaya 1, Moscow, 119882, Russia |
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Abstract: | Potential dependences of the angle of contact between perfluorodecaline C10F18 and copper, copper(I) sulfide, and copper telluride Cu4Te3 in 0.1 M CH3COONa are measured. The data are in good agreement with the metal hardness measured in 1 M KOH. The uncharged-surface potentials (USP) for copper, copper(I) sulfide, and copper telluride equal 0.05–0.07, –0.02 to –0.04, and 0.05–0.07 V (NHE) in 0.1 M CH3COONa. Studying the effect of Br– ions shows that USP for copper and Cu2S shift in, respectively, the negative and positive directions with an increase in [Br–]. For copper telluride, USP shifts in the positive direction at low Br– concentrations, and at NaBr concentrations in excess of 0.04 M, in the negative direction. |
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Keywords: | contact angle triple-phase boundary uncharged-surface potential perfluorodecaline copper copper chalcogenides |
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