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Article

Bio-Inspired Fluorine-Free Self-Cleaning Polymer Coatings

1
Laboratory for Processing of Advanced Composites (LPAC), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
2
Department of Applied Science and Technology Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
3
Center for Sustainable Future Technologies, CSFT, [email protected], Italian Institute of Technology, Corso Trento 21, 10129 Turin, Italy
*
Author to whom correspondence should be addressed.
Present address: Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland.
Coatings 2018, 8(12), 436; https://doi.org/10.3390/coatings8120436
Received: 30 September 2018 / Revised: 25 October 2018 / Accepted: 26 November 2018 / Published: 28 November 2018
(This article belongs to the Special Issue Advances in Organic and Polymeric Coatings )
Bio-inspired fluorine-free and self-cleaning polymer coatings were developed using a combination of self-assembly and UV-printing processes. Nasturtium and lotus leaves were selected as natural template surfaces. A UV-curable acrylate oligomer and three acrylated siloxane comonomers with different molecular weights were used. The spontaneous migration of the comonomers towards the polymer–air interface was found to be faster for comonomers with higher molecular weight, and enabled to create hydrophobic surfaces with a water contact angle (WCA) of 105°. The replication fidelity was limited for the nasturtium surface, due to a lack of replication of the sub-micron features. It was accurate for the lotus leaf surface whose hierarchical texture, comprising micropapillae and sub-micron crystalloids, was well reproduced in the acrylate/comonomer material. The WCA of synthetic replica of lotus increased from 144° to 152° with increasing creep time under pressure to 5 min prior to polymerization. In spite of a water sliding angle above 10°, the synthetic lotus surface was self-cleaning with water droplets when contaminated with hydrophobic pepper particles, provided that the droplets had some kinetic energy. View Full-Text
Keywords: self-cleaning; lotus; nasturtium; siloxane surfactants; acrylates; photopolymerization; UV nanoimprint lithography; PDMS template self-cleaning; lotus; nasturtium; siloxane surfactants; acrylates; photopolymerization; UV nanoimprint lithography; PDMS template
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MDPI and ACS Style

Wasser, L.; Dalle Vacche, S.; Karasu, F.; Müller, L.; Castellino, M.; Vitale, A.; Bongiovanni, R.; Leterrier, Y. Bio-Inspired Fluorine-Free Self-Cleaning Polymer Coatings. Coatings 2018, 8, 436. https://doi.org/10.3390/coatings8120436

AMA Style

Wasser L, Dalle Vacche S, Karasu F, Müller L, Castellino M, Vitale A, Bongiovanni R, Leterrier Y. Bio-Inspired Fluorine-Free Self-Cleaning Polymer Coatings. Coatings. 2018; 8(12):436. https://doi.org/10.3390/coatings8120436

Chicago/Turabian Style

Wasser, Lionel, Sara Dalle Vacche, Feyza Karasu, Luca Müller, Micaela Castellino, Alessandra Vitale, Roberta Bongiovanni, and Yves Leterrier. 2018. "Bio-Inspired Fluorine-Free Self-Cleaning Polymer Coatings" Coatings 8, no. 12: 436. https://doi.org/10.3390/coatings8120436

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