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AFM image (1 μm × 1 μm) of the selenium film.
Photographs illustrating the contact angle obtained for different probe liquids: (a) ethylene glycol, (b) de-ionized water, (c) mercury, and (d) gallium deposited onto the selenium surface. The photographs are side view images where the thin black line indicates the profile of the contact surface between the probe liquid and the selenium. These contact angle measurements were carried out using the sessile drop method.
versus for a selenium thin film. The red line indicates the evolution of the contact angle with the liquid surface energy of the probe liquid. Three zones are represented: , , and . The zone where indicates the possible values for the solid surface energy of selenium.
Liquid surface energy of each probe liquid and mean contact angle obtained on the selenium thin film for each probe liquid.
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