Patterning of a colloidal crystal film on a modified hydrophilic and hydrophobic surface

The unique photochemical properties of TiO₂ provides a stepwise approach for the easy and precise patterning of colloidal crystal films. In this approach patterns of hydrophobic and hydrophilic areas are formed on a TiO₂ surface and then a colored film of monodispersed polystyrene spheres is deposited on to the hydrophilic region (fish- shaped pattern in the example shown).