Figure 3From: Chances and limitations of nanosized titanium dioxide practical application in view of its physicochemical properties Comparison of contact angle ( α ) on control surface (a) and surface covered by a thin layer of nano-TiO 2 (b) in darkness. The surface covered by a thin layer of nano-TiO2 exhibits in darkness superhydrophobic properties; the contact angle is an obtuse angle, 90° < α < 180° (b).Back to article page