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Decane droplet on quartz plate immersed in a water and b 75 nm sulfonate-modified silica nanoparticle dispersion of 0.5 wt%. The contact angle is a 55° and b 43°. The color in b is digitally altered to see the droplet clearly since the light transmittance of nanoparticle dispersion is low because of particle size. (Color figure online)
