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Article

Biomimetic Approach for the Elaboration of Highly Hydrophobic Surfaces: Study of the Links between Morphology and Wettability

Laboratoire de Tribologie et Dynamique des Systèmes, Ecole Centrale de Lyon, UMR CNRS 5513, 69130 Ecully, France
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Academic Editor: Giuseppe Carbone
Biomimetics 2021, 6(2), 38; https://doi.org/10.3390/biomimetics6020038
Received: 30 April 2021 / Revised: 3 June 2021 / Accepted: 4 June 2021 / Published: 8 June 2021
This investigation of morphology-wetting links was performed using a biomimetic approach. Three natural leaves’ surfaces were studied: two bamboo varieties and Ginkgo Biloba. Multiscale surface topographies were analyzed by SEM observations, FFT, and Gaussian filtering. A PDMS replicating protocol of natural surfaces was proposed in order to study the purely morphological contribution to wetting. High static contact angles, close to 135, were measured on PDMS replicated surfaces. Compared to flat PDMS, the increase in static contact angle due to purely morphological contribution was around 20. Such an increase in contact angle was obtained despite loss of the nanometric scale during the replication process. Moreover, a significant decrease of the hysteresis contact angle was measured on PDMS replicas. The value of the contact angle hysteresis moved from 40 for flat PDMS to less than 10 for textured replicated surfaces. The wetting behavior of multiscale textured surfaces was then studied in the frame of the Wenzel and Cassie–Baxter models. Whereas the classical laws made it possible to describe the wetting behavior of the ginkgo biloba replications, a hierarchical model was developed to depict the wetting behavior of both bamboo species. View Full-Text
Keywords: wetting; hydrophobic surfaces; biomimetics; replication process; multiscale roughness wetting; hydrophobic surfaces; biomimetics; replication process; multiscale roughness
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MDPI and ACS Style

Legrand, Q.; Benayoun, S.; Valette, S. Biomimetic Approach for the Elaboration of Highly Hydrophobic Surfaces: Study of the Links between Morphology and Wettability. Biomimetics 2021, 6, 38. https://doi.org/10.3390/biomimetics6020038

AMA Style

Legrand Q, Benayoun S, Valette S. Biomimetic Approach for the Elaboration of Highly Hydrophobic Surfaces: Study of the Links between Morphology and Wettability. Biomimetics. 2021; 6(2):38. https://doi.org/10.3390/biomimetics6020038

Chicago/Turabian Style

Legrand, Quentin, Stephane Benayoun, and Stephane Valette. 2021. "Biomimetic Approach for the Elaboration of Highly Hydrophobic Surfaces: Study of the Links between Morphology and Wettability" Biomimetics 6, no. 2: 38. https://doi.org/10.3390/biomimetics6020038

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