Abstract
We present an alternative approach for controlling the water adhesion on solid superhydrophobic surfaces by varying their coverage with a spray coating technique. In particular, micro-, submicro-, and nanorough surfaces were developed starting from photolithographically tailored SU-8 micropillars that were used as substrates for spraying first poly(tetrafluoroethylene) submicrometer particles and subsequently iron oxide nanoparticles. The sprayed particles serve to induce surface submicrometer and nanoscale roughness, rendering the SU-8 patterns superhydrophobic (apparent contact angle values of more than 150°), and also to tune the water adhesion between extreme states, turning the surfaces from “non-sticky” to “sticky” while preserving their superhydrophobicity. The influence of the chemical properties and of the geometrical characteristics of the functionalized surfaces on the wetting properties is discussed within the frame of the theory. This simple method can find various applications in the fabrication of microfluidic devices, smart surfaces, and biotechnological and antifouling materials.
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Acknowledgments
The authors would like to kindly acknowledge the useful advices of Dr. Federico Grisotto, Dr, Ioannis Liakos, Dr. Fabrizio Spano, Dr. Francesca Villafiorita-Monteleone, and Mr. Gabriele Nanni, all of them working on the Smart Materials platform of the Italian Institute of Technology, in the Center for Biomolecular Nanotechnologies in Arnesano, Lecce, Italy. A. Athanassiou and P. D. Cozzoli acknowledge financial support from the Italian Ministry of Education, University and Research through the project AEROCOMP (contract MIUR no. DM48391).
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This article is part of the Topical Collection on Contact Angle Hysteresis
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Milionis, A., Martiradonna, L., Anyfantis, G.C. et al. Control of the water adhesion on hydrophobic micropillars by spray coating technique. Colloid Polym Sci 291, 401–407 (2013). https://doi.org/10.1007/s00396-012-2752-5
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DOI: https://doi.org/10.1007/s00396-012-2752-5