Fig. 6
From: Wetting and adhesion properties of quasicrystals and complex metallic alloys
Contact angle θ measured on a specimen of O1-AlCuFeCr approximant after polishing using corundum abrasive papers of increasing grit size. Open dots are for data obtained when viewing the droplet along the direction of polishing and solid dots for measurements perpendicular to it. The two sets of data converge to the same value at sufficiently low roughness, or high mesh size