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Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography

Salvinia leaves represent an extraordinary example of how nature found a strategy for the long term retainment of air, and thus oxygen, on a surface, the so-called ‘Salvinia effect’, thanks to the peculiar three-dimensional and hierarchical shape of the hairs covering the leaves. Here, starting from...

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Autores principales: Tricinci, Omar, Terencio, Tercio, Pugno, Nicola M., Greco, Francesco, Mazzolai, Barbara, Mattoli, Virgilio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6187866/
https://www.ncbi.nlm.nih.gov/pubmed/30400556
http://dx.doi.org/10.3390/mi8120366
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author Tricinci, Omar
Terencio, Tercio
Pugno, Nicola M.
Greco, Francesco
Mazzolai, Barbara
Mattoli, Virgilio
author_facet Tricinci, Omar
Terencio, Tercio
Pugno, Nicola M.
Greco, Francesco
Mazzolai, Barbara
Mattoli, Virgilio
author_sort Tricinci, Omar
collection PubMed
description Salvinia leaves represent an extraordinary example of how nature found a strategy for the long term retainment of air, and thus oxygen, on a surface, the so-called ‘Salvinia effect’, thanks to the peculiar three-dimensional and hierarchical shape of the hairs covering the leaves. Here, starting from the natural model, we have microfabricated hairs inspired by those present on the Salvinia molesta leaves, by means of direct laser lithography. Artificial hairs, like their natural counterpart, are composed of a stalk and a crown-like head, and have been reproduced in the microscale since this ensures, if using a proper design, an air-retaining behavior even if the bulk structural material is hydrophilic. We have investigated the capability of air retainment inside the heads of the hairs that can last up to 100 h, demonstrating the stability of the phenomenon. For a given dimension of the head, the greater the number of filaments, the greater the amount of air that can be trapped inside the heads since the increase in the number of solid–air interfaces able to pin the liquid phase. For this reason, such type of pattern could be used for the fabrication of surfaces for controlled gas retainment and gas release in liquid phases. The range of applications would be quite large, including industrial, medical, and biological fields.
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spelling pubmed-61878662018-11-01 Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography Tricinci, Omar Terencio, Tercio Pugno, Nicola M. Greco, Francesco Mazzolai, Barbara Mattoli, Virgilio Micromachines (Basel) Article Salvinia leaves represent an extraordinary example of how nature found a strategy for the long term retainment of air, and thus oxygen, on a surface, the so-called ‘Salvinia effect’, thanks to the peculiar three-dimensional and hierarchical shape of the hairs covering the leaves. Here, starting from the natural model, we have microfabricated hairs inspired by those present on the Salvinia molesta leaves, by means of direct laser lithography. Artificial hairs, like their natural counterpart, are composed of a stalk and a crown-like head, and have been reproduced in the microscale since this ensures, if using a proper design, an air-retaining behavior even if the bulk structural material is hydrophilic. We have investigated the capability of air retainment inside the heads of the hairs that can last up to 100 h, demonstrating the stability of the phenomenon. For a given dimension of the head, the greater the number of filaments, the greater the amount of air that can be trapped inside the heads since the increase in the number of solid–air interfaces able to pin the liquid phase. For this reason, such type of pattern could be used for the fabrication of surfaces for controlled gas retainment and gas release in liquid phases. The range of applications would be quite large, including industrial, medical, and biological fields. MDPI 2017-12-20 /pmc/articles/PMC6187866/ /pubmed/30400556 http://dx.doi.org/10.3390/mi8120366 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Tricinci, Omar
Terencio, Tercio
Pugno, Nicola M.
Greco, Francesco
Mazzolai, Barbara
Mattoli, Virgilio
Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography
title Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography
title_full Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography
title_fullStr Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography
title_full_unstemmed Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography
title_short Air Trapping Mechanism in Artificial Salvinia-Like Micro-Hairs Fabricated via Direct Laser Lithography
title_sort air trapping mechanism in artificial salvinia-like micro-hairs fabricated via direct laser lithography
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6187866/
https://www.ncbi.nlm.nih.gov/pubmed/30400556
http://dx.doi.org/10.3390/mi8120366
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