https://www.selleckchem.com/pr....oducts/o-pentagalloy
It has been verified that a surface of single micro-scale structures with certain roughness could exhibit petal effect. That is, water drops with a contact angle larger than 150° would pin on the petal effect surface. It is conjectured that the water drop could pin on the single micro-scale roughness petal effect surface by totally infiltrating into spaces (or grooves) between micro-pillars. An inverted optical microscopy system is synchronically applied in the process of advancing/receding contact angle (ACA/RCA) measurem
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