Superhydrophobic SLA 3D Printed Materials Modified with Nanoparticles Biomimicking the Hierarchical Structure of a Rice Leaf

Overview

Journal Sci Technol Adv Mater

Specialty Biomedical Engineering

Date 2022 May 13

PMID 35557509

Authors

Belen Barraza

Felipe Olate-Moya

Gino Montecinos

Jaime H Ortega

Andreas Rosenkranz

Aldo Tamburrino

Humberto Palza

Affiliations

Soon will be listed here.

Abstract

The rice leaf, combining the surface properties of lotus leaves and shark skin, presents outstanding superhydrophobic properties motivating its biomimesis. We created a novel biomimetic rice-leaf superhydrophobic surface by a three-level hierarchical structure, using for a first time stereolithographic (SLA) 3D printed channels (100µm width) with an intrinsic roughness from the printing filaments (10µm), and coated with TiO nanoparticles (22 and 100nm). This structure presents a maximum advancing contact angle of 165° characterized by lower both anisotropy and hysteresis contact angles than other 3D printed surfaces, due to the presence of air pockets at the surface/water interface (Cassie-Baxter state). Dynamic water-drop tests show that the biomimetic surface presents self-cleaning, which is reduced under UV-A irradiation. The biomimetic surface further renders an increased floatability to 3D printed objects meaning a drag-reduction due to reduced water/solid contact area. Numerical simulations of a channel with a biomimetic wall confirm that the presence of air is essential to understand our results since it increases the average velocity and decreases the friction factor due to the presence of a wall-slip velocity. Our findings show that SLA 3D printing is an appropriate approach to develop biomimetic superhydrophobic surfaces for future applications in anti-fouling and drag-reduction devices.

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