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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 30: Poster: Focus: Wetting on smooth and rough surfaces: From spreading to superhydrophobicity

CPP 30.5: Poster

Wednesday, March 13, 2013, 16:30–18:30, Poster C

Transformation of black candle soot into a transparent robust superamphiphobic coating — •Xu Deng, Lena Mammen, Periklis Papadopoulos, Maxime Paven, Hans-Jürgen Butt, and Doris Vollmer — Max Planck Institute for Polymer Research,Ackermannweg 10, D-55128, Mainz, Germany

Coating is an essential step in adjusting the surface properties of materials. Superhydrophobic coatings with contact angles greater than 150° and roll off angles below 10° for water have been developed, based on low energy surfaces and roughness on the nano- and micrometer scales. However, these surfaces are still wetted by organic liquids such as surfactant-based solutions, alcohols, or alkanes. Coatings that are simultaneously superhydrophobic and superoleophobic are rare. We designed an easily fabricated, transparent, and oil-rebounding superamphiphobic coating. A porous deposit of candle soot was coated with a 25 nm thick silica shell. The black coating became transparent after calcination at 600°C. After silanization the coating is superamphiphobic and remained so even after its top layer was damaged by sand impingement.