Fig. 5From: Modulation of nanoparticle separation by initial contact angle in coffee ring effectContact angle of droplet having same volume (0.8 µl) a θ1 = 50°, θ2 = 30°, θ3 = 14°. Fluorescence image of 100 nm, 500 nm, 1 µm beads in the evaporated droplet at b θ1 = 50°, c θ2 = 30°, d θ3 = 14°. e Separation between 100 nm and 1 µm beads varied with θBack to article page