Site-Selective TiO 2 Coating on Asymmetric Patchy Particles.

The successful fabrication of TiO2 -faced asymmetric patchy particles consisting of polystyrene and a Fe3 O4 /SiO2 /TiO2 part is described. Such particles can be of large interest for photochemistry. The used site-selective coating approach demonstrates a modification strategy for a special patchy particle family which may have a general character. The stability of the coating has been tested under several conditions with no sign of disruption. The influence of the prepared asymmetric particles on oil/water phase mixing behavior was tested and turned out to be very diverse. Oils with low polarity (e.g., hexadecane, cyclohexane, octadecane) can form Pickering emulsions by the help of these particles; oils with high polarity (e.g., 1-octanol) form monodisperse macrodroplet systems with unusual stability.