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New Experimental Setup for Wettability Characterization under Monitored Oxygen Activity: I, Role of Oxidation State and Defect Concentration on Oxide Wettability by Gold
Author(s) -
Chatain Dominique,
Chabert Françoise,
Ghetta Véronique,
Fouletier Jacques
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03941.x
Subject(s) - wetting , characterization (materials science) , oxide , oxygen , chemical engineering , materials science , contact angle , oxidation state , chemistry , inorganic chemistry , nanotechnology , metallurgy , composite material , metal , organic chemistry , engineering
A sessile drop setup has been combined with an oxygen sensor, an electrochemical pump, and a renewable oxygen getter. The oxygen activity of a metal–oxide sample can be monitored in the 10 −9 –1 range, in a flowing gas, that enables the control of the defect concentration in the oxide and of the oxygen content in the metal. The stoichiometry of the substrate can also be modified by electrochemical reduction, allowing the oxygen activity of the sample to be monitored down to values as low as 10 −20 . The dependence on oxygen activity of the wetting and the thermodynamic adhesion of gold on sapphire, titanium oxides, and yttria‐stabilized zirconia is presented to illustrate the versatility of the equipment.