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The size effect of a drop on the contact angle was discussed for the Au/Al2O3 system. As the size of the drop decreases, the shape of the drop closes to a sphere and the contact angle is obtained by the equation 1⁄4 cos ð1 h=RMax.Þ, where is the contact angle between the drop and substrates, h is the height of the drop and RMax. is the maximum radius of the drop. The contact angle between liquid gold and alumina polycrystalline substrates having the roughness of 0.141mm in RA number slightly increased as the sample size decreases to about 10 mm, yielding 134 and 3:50 10 7 N as the macro-scale contact angle and the line tension, respectively.

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Determination of Macro-Contact Angle and Line Tension at High Temperatures for Au/Al&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;3&lt;/SUB&gt; System at 1373 K Using a Micro-Scale Wetting Method