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Results of water contact angle measurements. Photographs of water droplets on the surface of (a) micro-Bi-180s, (b) micro-Bi-300s, (c) nano-Bi-180s, and (d) nano-Bi-300s. (e) Comparison of averaged values of water contact angles for the surfaces of micro-Bi-180s, nano-Bi-180s, micro-Bi-300s, and nano-Bi-300s.
