Copying the small structures of Salvinia leaves

Copying the small structures of Salvinia leaves
Salvinia leaves and the eggbeater structures. Credit: Jilin University

Several plants and animals have evolved surfaces with long-term (i.e., days to months) air-retainability to prevent wetting and submersion. One example is Salvinia, a plant floating on water. The secret "how do they maintain an air-mattress" has been unraveled by researchers.

Researchers at Jilin University reviewed recent progress in the study of Salvinia leaves and their artificial replicas. "Salvinia has complex multicellular hairs on the upper side of its leaves, and each group of four hairs is connected at the terminal ends, forming an eggbeater . The hairs are coated with hydrophobic wax crystals, while the patches at the terminal ends of the hairs lack wax crystals and are, therefore, hydrophilic. These features make the more stable, exhibiting long-term air-retention ability," says author Huichao Jin of Jilin University in Changchun, China.

Since the air-retention ability of Salvinia leaves was discovered, researchers began to fabricate artificial Salvinia leaves and investigated their potential applications. However, the complex eggbeater structures present a difficult challenge for traditional manufacturing methods. In the past decade, photolithography, direct laser lithography, , electrodeposition, electrostatic flocking, 3D printing, chemical etching, and plasma etching recently have been developed for fabricating Salvinia-inspired structures. However, the complex structures make many of these techniques unable to replicate the fine structures. Although direct laser lithography and 3D printing techniques succeed in fabricating fine structures, they cannot fabricate the hydrophilic tips at the end of hairs. Therefore, it is still challenging to fabricate artificial Salvinia leaves.

The robust air-mattressin Salvinia structures acts as a for water to reach the substrate. This inspires many engineering applications, including drag reduction, water harvesting, evaporation, and repellence, oil/water separation, and thermal insulation. These works are currently limited to early laboratory demonstrations. There are still challenges in the development of artificial surfaces suitable for the complexity and variability of the real environment.

Jin and his colleagues are exploring the potential of Salvinia structures in preventing medical bacterial infection. "The air-mattress acts as a physical barrier for to approach the substrate, and it can also act as a physical barrier for preventing bacteria reach substrates," says Jin. He points that traditional antibacterial surfaces involving antibiotics may cause drug resistance while the artificial Salvinia-inspired surfaces are free of antibiotics. Employing Salvinia structures to prevent medical bacterial infection may be a promising strategy.

More information: Wei Bing et al, Small Structure, Large Effect: Functional Surfaces Inspired by Salvinia Leaves, Small Structures (2021). DOI: 10.1002/sstr.202100079

Provided by Jilin University

Citation: Copying the small structures of Salvinia leaves (2021, September 15) retrieved 13 April 2024 from https://phys.org/news/2021-09-small-salvinia.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

A novel salvinia-like slippery surface

17 shares

Feedback to editors