METALS COATED WITH FILMS OF LOW SURFACE ENERGY AS REFERENCE ELECTRODES FOR THE MEASUREMENTS OF CONTACT POTENTIAL DIFFERENCES
The central problem in the measurement of the contact potentials of solid and liquid surfaces in gaseous atmospheres is the stability of the contact potential of the reference electrode to which the potential difference between the two is referred. Noble metals, such as gold or platinum, are usually employed as reference electrcdes, but, in gaseous atmospheres, their contact potentials can change significantly because of vapor adsorption on the reference surfaces. This occurs even on aged metals, the effect of adsorbed water vapor being especially great. But a metal which has been coated with a low-energy film, such as Teflon or FEP Teflon resin, exhibits little change in the contact pctential in a wide variety of polar and nonpolar vapors. This is demonstrated by the results of recent studies of metals in a nitrogen atmosphere in which the water-vapor content was varied from 1% to as high as 91% R.H. Teflon-coated metal reference electrodes have proved to be remarkably stable under these conditions. (auth)
- Research Organization:
- Naval Research Lab., Washington, D.C.
- NSA Number:
- NSA-14-002365
- OSTI ID:
- 4237140
- Report Number(s):
- NRL-5383; Project NR 472-000
- Resource Relation:
- Other Information: Project NR 472-000. Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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