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Biomimetics
Special Issues
Bioinspired Smart Metasurfaces: Sensation, Regulation, and Protection
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Bioinspired Smart Metasurfaces: Sensation, Regulation, and Protection

A special issue of Biomimetics (ISSN 2313-7673). This special issue belongs to the section "Biomimetic Surfaces and Interfaces".

Deadline for manuscript submissions: closed (15 February 2023) | Viewed by 4260

Special Issue Editor

Dr. Wanbo Li

E-Mail Website
Guest Editor
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
Interests: bioinspired engineering; surface science; bioinspired manufacturing; bioinspired sensors; multiphase flow transport; superwettability

Special Issue Information

Dear Colleagues,

As a key feature of many natural living beings, natural skins evolve unique topographies that function as smart surfaces to interact with and adapt to complex and dynamic environments, without confronting trade-offs among structural freedom, material costs, and functional diversity. For example, the springtails equip with amphiphobic doubly reentrant surfaces to repel organic fluid wetting and keep breathing in humid soil. Acanthopleura granulata uses a chiton shell to attain mechanical protection while achieving efficient photosensory in a gloomy environment. Many insects such as butterflies and cicada integrate nonwettability and photo-manipulation functions in their wings, and consequently maintain anti-biofouling, self-cleaning, and antibacterial properties, to name a few.

The exploration of such nature’s fascinating strategies has given birth to many nature-inspired smart metasurfaces for delicate sensation, control, and protection, with new concepts, manufacturing technologies, and disruptive applications continuing to burgeon in recent years. To date, research on nature-inspired metasurfaces is entering its “golden” age and pioneering the two-century-old surface science and engineering area. This Special Issue aims to showcase research papers, short communications, and review articles associated with this research area. Topics of interest include but are not limited to bioinspired manufacturing, droplet and liquid transportation, multiphase matter regulation, adhesion and tribology, sensors and actuators, and mechanical metamaterials, all of which should involve nature-inspired surfaces.

Dr. Wanbo Li
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Biomimetics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nature-inspired surfaces
  • metasurfaces
  • bio-manufacturing
  • multiphase regulation
  • sensors and actuators
  • mechanical metamaterials

Published Papers (2 papers)

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Research

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11 pages, 2515 KiB  
Article
Bidirectional Underwater Drag Reduction on Bionic Flounder Two-Tier Structural Surfaces
by Xixing He, Yihe Liu, Haiyang Zhan, Yahua Liu, Lei Zhao and Shile Feng
Biomimetics 2023, 8(1), 116; https://doi.org/10.3390/biomimetics8010116 - 11 Mar 2023
Cited by 1 | Viewed by 1664
Abstract
Engineering marvels found throughout the exclusive structural features of biological surfaces have given rise to the progressive development of skin friction drag reduction. However, despite many previous works reporting forward drag reduction where the bio-inspired surface features are aligned with the flow direction, [...] Read more.
Engineering marvels found throughout the exclusive structural features of biological surfaces have given rise to the progressive development of skin friction drag reduction. However, despite many previous works reporting forward drag reduction where the bio-inspired surface features are aligned with the flow direction, it is still challenging to achieve bidirectional drag reduction for non-morphable surface structures. Inspired by the flounder ctenoid scales characterized by tilted, millimeter-sized oval fins embedded with sub-millimeter spikes, we fabricate a bionic flounder two-tier structural surface (BFTSS) that can remarkably reduce the forward skin friction drag by ηdr = 19%. Even in the backwards direction, where the flow is completely against the tilting direction of surface structures, BFTSS still exhibits a considerable drag reduction of ηdr = 4.2%. Experiments and numerical simulations reveal that this unique bidirectional drag reduction is attributed to synergistic effects of the two-tier structures of BFTSS. The array of oval fins can distort the boundary layer flow and mitigate the viscous shear, whilst the microscale spikes act to promote the flow separation to relieve the pressure gradient in the viscous sublayer. Notably, the pressure gradient relief effect of microscale spikes remains invariant to the flow direction and is responsible for the backward drag reduction as well. The bidirectional drag reduction of BFTSS can be extensively applied in minimizing the energy consumption of ships and underwater vessels, as well as in pipeline transport. Full article
(This article belongs to the Special Issue Bioinspired Smart Metasurfaces: Sensation, Regulation, and Protection)
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Review

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22 pages, 5462 KiB  
Review
Preparation of 2D Materials and Their Application in Oil–Water Separation
by Jie Li, Yushan Li, Yiyi Lu, Yuke Wang, Yunjie Guo and Wentian Shi
Biomimetics 2023, 8(1), 35; https://doi.org/10.3390/biomimetics8010035 - 15 Jan 2023
Cited by 8 | Viewed by 2233
Abstract
The problems of environmental pollution are increasingly severe. Among them, industrial wastewater is one of the primary sources of pollution, so it is essential to deal with wastewater, especially oil and water mixtures. At present, biomimetic materials with special wettability have been proven [...] Read more.
The problems of environmental pollution are increasingly severe. Among them, industrial wastewater is one of the primary sources of pollution, so it is essential to deal with wastewater, especially oil and water mixtures. At present, biomimetic materials with special wettability have been proven to be effective in oil-water separation. Compared with three-dimensional (3D) materials, two-dimensional (2D) materials show unique advantages in the preparation of special wettable materials due to their high specific surface area, high porosity, controlled structure, and rich functional group rich on the surface. In this review, we first introduce oil–water mixtures and the common oil–water separation mechanism. Then, the research progress of 2D materials in oil–water separation is presented, including but not limited to their structure, types, preparation principles, and methods. In addition, it is still impossible to prepare 2D materials with large sizes because they are powder-like, which greatly limits the application in oil–water separation. Therefore, we provide here a review of several ways to transform 2D materials into 3D materials. In the end, the challenges encountered by 2D materials in separating oil–water are also clarified to promote future applications. Full article
(This article belongs to the Special Issue Bioinspired Smart Metasurfaces: Sensation, Regulation, and Protection)
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