Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Poster: Colloids and Complex Liquids

CPP 38.12: Poster

Wednesday, March 16, 2011, 17:00–19:00, P2

Transparent superhydrophobis surfaces made out of hybrid raspberry-like particles — •Doris Vollmer, Maria d'Acunzi, Lena Mammen, Xu Deng, and Hans-Jürgen Butt — Max Planck Institute for Polymer Research

We report a novel method to prepare superhydrophobic films from raspberry-like particles. The term raspberry refers to the topography of the surface of the hybrid particles, which consists of a micrometer-sized polystyrene core and a rough silica shell. Multilayers of particles are formed by evaporation of the aqueous dispersant. Mechanical stability can, for example, be induced by exposure of the multilayer to a good solvent for the polymer core. Polystyrene leaks out of the core and forms bridges between the particles. The films are hydrophobized by silanization with a semifluorinate silane. Films show static contact angle for water of about 160° and roll-off angle of a few degree. Furthermore, we discuss the mechanical stability of the coatings and show how to render them transparent.

D'Acunzi, L. Mammen, M. Singh, X. Deng, M. Roth, G.K. Auernhammer, H.-J. Butt, and D. Vollmer, Faraday Discussion, 146, 35-48, 2010