Superoleophobicity of a Material Made from Fluorinated Titania Nanoparticles

Abstract

Superoleophobic surface prepared by using perfluorooctanoic acid modified titania (TiO₂) nanoparticles is described. A variety of liquids, ranging from water to organic liquids, even the volatile liquids, such as toluene, chloroform and tetrachloromethane, exhibit typical spherical shapes on the fluorinated TiO₂ surface with the contact angles of over 150° and easily roll off at a small tilt angle. The reasons of the superoleophobicity of the fluorinated TiO₂ nanoparticles are particularly discussed in detail. Besides the low surface energy and rough structure, the adhesion of TiO₂ particles at the bottom of liquid droplets is considered as a crucial factor to obtain the superoleophobicity.

Keywords:

• Fluorinated
• modified
• superoleophobic
• titania

Acknowledgements

The authors acknowledge the National Nature Science Foundation of China (Grant No. 50773089 and Grant No. 50835009).