Abstract
The paper reports on the wetting characterization of two surfaces presenting reentrant shapes at micro- and nanoscale using low surface tension liquids (down to 28 mN/m). On the one hand, mushroom-like microstructures are fabricated by molding poly(dimethylsiloxane) (PDMS) onto a patterned sacrificial photoresist bilayer. On the other hand, zinc oxide nanostructures (ZnO NS) are synthesized by easy and fast chemical bath deposition technique. The PDMS and ZnO NS surfaces are then chemically modified with 1H,1H,2H,2H-perfluorodecyltrichlorosilane in vapor phase. Both PDMS and ZnO NS surfaces exhibit a large apparent contact angle (>150°) and contact angle hysteresis varying from 50° to a quasi-null value. This large discrepancy can be ascribed to the length scale and topography of the structures, promoting either a vertical imbibition or a lateral spreading within the roughness.
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Acknowledgments
We acknowledge the European Regional Development Fund for financial support under the INTERREG IVa FW1.1.9 "PLASMOBIO" project and the European Community Seventh Framework Programme (FP7/20072013) under grant agreement no. 22724. This work was supported by Nord-Pas-de-Calais Region through the 2008-2013 CIA State Region Planning contract and by the Ministry of Defense. The authors thank Mr. Christophe Boyaval for SEM imaging.
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Renaud Dufour and Guillaume Perry contributed equally to the article and share first co-authorship.
This article is part of the Topical Collection on Contact Angle Hysteresis
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Dufour, R., Perry, G., Harnois, M. et al. From micro to nano reentrant structures: hysteresis on superomniphobic surfaces. Colloid Polym Sci 291, 409–415 (2013). https://doi.org/10.1007/s00396-012-2750-7
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DOI: https://doi.org/10.1007/s00396-012-2750-7