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Surface tension of mercury on glass, molybdenum and tungsten substrates

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Abstract

The surface tension of mercury on a glass substrate has been determined by the sessile drop technique. It was found that the uncorrected value of surface tension varied with changes in the drop diameter in the range from 0.60 to 4.10 cm. From the Worthington equation for curvature a corrected surface tension of 456 dyn/cm was obtained for the 4.1 cm diameter drop, a value which is in reasonable agreement with previous investigations. However, application of a curve fitting procedure to the results from the smaller drops gave a corrected surface tension which was approximately independent of diameter but at a smaller average value of 413 dyn/cm. The surface tension of a 1.20 cm diameter drop was also measured on tungsten and molybdenum substrates and, in general, corrected values larger than on glass were derived. It is suggested that the small corrected values obtained for drops ⩽2.06 cm in diameter are due to adsorption of impurity from the glass substrate.

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Authors and Affiliations

  1. Department of Materials, Queen Mary College, London, UK

    W. Bonfield

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  1. W. Bonfield
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Bonfield, W. Surface tension of mercury on glass, molybdenum and tungsten substrates. J Mater Sci 7, 148–152 (1972). https://doi.org/10.1007/BF00554174

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  • DOI: https://doi.org/10.1007/BF00554174

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