Figure 2From: 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). Both surfaces are exposed to UV radiation. The surface covered by a thin layer of nano-TiO2 and exposed to UV radiation exhibits superhydrophilic properties; the contact angle is an acute angle, 0° < α < 90° (b).Back to article page