Temperature-Dependence of the Contact Angle of Water on Graphite, Silicon, and Gold

Osborne III, Kenneth L

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Temperature-Dependence of the Contact Angle of Water on Graphite, Silicon, and Gold

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The temperature dependence of the contact angle of water on graphite, silicon and gold was investigated under various conditions to test the Sharp-Kink Approximation. Despite correctly predicting the contact angle at room temperature, the ideal Sharp-Kink Approximation was not found to accurately describe the contact angle's temperature dependence. The discrepancies from the predicted contact angle were characterized in terms of a correction H(T) to the liquid-solid surface tension. H(T) was found to be linear in temperature and decreasing, and is consistent with electrostatic charge effects.

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