Special Issue "Recent Advances in Superhydrophobic and Icephobic Surfaces"

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: 31 August 2023 | Viewed by 2586

Special Issue Editor

Prof. Dr. Zhiwei He
E-Mail Website
Guest Editor
Anti-icing Materials (AIM) Lab, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Interests: superhydrophobic surfaces; superoleophilic surfaces; icephobic surfaces

Special Issue Information

Dear Colleagues,

I invite you to submit your recent research work to the Special Issue titled “Recent Advances in Superhydrophobic and Icephobic Surfaces”. Bio-inspired by nature, superhydrophobic surfaces have been utilized in various applications, including self-cleaning, anti-icing, anti-fouling, anti-fogging, anti-corrosion, oil/water separation, sensors, and energy storage devices. The long-term use and maintenance of superhydrophobicity in harsh environments are still big challenges in practical applications, which we would like to solve by rationally designing mechanically durable superhydrophobic surfaces. Due to their excellent water repellency, superhydrophobic surfaces can be applied in the field of anti-icing applications. However, superhydrophobic surfaces can lose their icephobicity due to many factors (i.e., condensation, the interlocking effect between the ice and interface, the sustainability of low surface energy); thus, we welcome discussions regarding the similarities, distinctions, and correlations between superhydrophobic and icephobic surfaces.

Although ice accumulation on exposed surfaces is an unavoidable problem as time elapses and temperatures lower sufficiently, to suppress such an issue, various types of icephobic surfaces have been developed, including superhydrophobic surfaces (SHSs), aqueous lubricating layers, organic lubricating layers, organogels, polyelectrolyte brush layers, electrolyte-based hydrogels, multi-crack initiator-promoted surfaces, etc. Generally, the two important issues for designing icephobic surfaces are the low ice adhesion strength and mechanical durability after icing/de-icing cycles. Moreover, very recently, active de-icing approaches (magnetic responsive, electro-thermal, and photo-thermal stimuli) have also been introduced to combine with passive icephobic surfaces for the realization of rapid and reliable de-icing. In short, the aim of this Special Issue is to summarize recent experimental and computational advances in both superhydrophobic and icephobic surfaces, as we hope for it to open new pathways for further research in both superhydrophobic and icephobic surfaces.

In particular, the topics of interest include, but are not limited to:

  • Design and preparation of superhydrophobic and icephobic surfaces;
  • Various applications of superhydrophobic surfaces;
  • The sustainability and durability of superhydrophobicity;
  • Correlations between superhydrophobicity and icephobicity;
  • Icing delay time on icephobic surfaces;
  • Low ice adhesion strength surfaces;
  • Durable icephobic surfaces;
  • Anti-icing mechanisms;
  • Active de-icing approaches (electro-thermal or photo-thermal stimuli);
  • Multi-scale simulations on superhydrophobic and icephobic surfaces.

Prof. Dr. Zhiwei He
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. Coatings 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

  • self-cleaning
  • repellency
  • anti-icing
  • icing delay time
  • ice adhesion strength

Published Papers (4 papers)

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Research

Article
Numerical Investigation of the Effect of Symmetry on Evaporation Triggered Elastocapillary Top-Gathering of High Aspect Ratio Micropillars
Coatings 2023, 13(2), 292; https://doi.org/10.3390/coatings13020292 - 28 Jan 2023
Viewed by 214
Abstract
High-aspect-ratio (HAR) micropillar arrays offer a wide range of applications in micro-contact printing, switchable transparent optical windows, superhydrophobic surfaces, mechanical sensors, and actuators, due to their properties such as large surface area and excellent mechanical compliance. However, owing to their high aspect ratio, [...] Read more.
High-aspect-ratio (HAR) micropillar arrays offer a wide range of applications in micro-contact printing, switchable transparent optical windows, superhydrophobic surfaces, mechanical sensors, and actuators, due to their properties such as large surface area and excellent mechanical compliance. However, owing to their high aspect ratio, these microstructures are prone to lateral deflection by elastocapillary forces in liquid environments, which is known as top-gathering, limiting their manufacturing processes and applications. Here, the impact of symmetry on evaporation triggered top-gathering of micropillars was studied numerically. The initiation of the micropillar deflection due to capillary forces under varying force distributions was simulated using a COMSOL Multiphysics simulation package. The simulation was carried out for the configurations of two, four, and an array of micropillars. For the four micropillar configuration, a new equation was suggested for calculating the micropillar deflection due to elastocapillary forces, using force distributions around the micropillars. The suggested equation was verified by comparison with the experimental observations. The effect of droplet evaporation on deflection/top-gathering of micropillars was also investigated. It was found that initiation of deflection is due to asymmetry at the rim of the droplet, generating domino-like deflection of the other micropillars. This study provides a new equation/criterion for estimating deflection of the micropillars, suggesting array designs that are resistant to such deflections when interacting with liquids. Full article
(This article belongs to the Special Issue Recent Advances in Superhydrophobic and Icephobic Surfaces)
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Article
An Experimental Study on Adhesion Strength of Offshore Atmospheric Icing on a Wind Turbine Blade Airfoil
Coatings 2023, 13(1), 164; https://doi.org/10.3390/coatings13010164 - 11 Jan 2023
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Abstract
When wind turbines work in a cold and humid environment, especially offshore condition, ice accretion on the blade surfaces has a negative effect on the aerodynamic performance. In order to remove the ice from the wind turbine blade, the adhesive characteristics of atmospheric [...] Read more.
When wind turbines work in a cold and humid environment, especially offshore condition, ice accretion on the blade surfaces has a negative effect on the aerodynamic performance. In order to remove the ice from the wind turbine blade, the adhesive characteristics of atmospheric icing on the blade surface should be mastered under various conditions. The objective of this study is to evaluate the effects of offshore atmospheric conditions, including wind speeds, ambient temperatures and, especially, the salt contents on ice adhesion strength for wind turbine blades. The experiments were conducted on a NACA0018 blade airfoil under conditions including an ambient temperature of −3 °C~−15 °C, wind speed of 6 m/s~15 m/s and salt content of 1~20 mg/m3. The results showed that salt content was the most important factor affecting the ice adhesion strength, followed by ambient temperature and wind speed. The interactive effect of wind speed and salt content, ambient temperature and salt content were extremely significant. The research can provide a reference for the anti-icing for offshore wind turbines. Full article
(This article belongs to the Special Issue Recent Advances in Superhydrophobic and Icephobic Surfaces)
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Article
Splitting an Impacting Droplet by a Superhydrophobic Wire
Coatings 2022, 12(12), 1866; https://doi.org/10.3390/coatings12121866 - 30 Nov 2022
Viewed by 593
Abstract
Splitting a droplet into several segments is of great significance in many applications such as the detection of tiny liquid samples, whereas the surface tension tends to hold liquid to remain as one drop, causing difficulty in separating the droplet into pieces. In [...] Read more.
Splitting a droplet into several segments is of great significance in many applications such as the detection of tiny liquid samples, whereas the surface tension tends to hold liquid to remain as one drop, causing difficulty in separating the droplet into pieces. In this work, a method is proposed to split an impacting droplet with a relatively high velocity or Weber number into two halves by a superhydrophobic wire. The effects of the wire wettability and the impact velocity of the droplet on the splitting phenomena and the efficacy to an anti-icing application are investigated. Compared to a hydrophilic wire, a superhydrophobic wire splits an impacting droplet at a relatively high speed of the Weber number greater than 3.1 and inhibits ice accretion at the temperature as low as −20 °C. The results suggest that a superhydrophobic wire can be utilized in the droplet manipulation and anti-icing applications such as power lines in high latitude areas. Full article
(This article belongs to the Special Issue Recent Advances in Superhydrophobic and Icephobic Surfaces)
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Article
The Synergistic Effect of Terminal and Pendant Fluoroalkyl Segments on Properties of Polyurethane Latex and Its Film
Coatings 2022, 12(9), 1271; https://doi.org/10.3390/coatings12091271 - 31 Aug 2022
Viewed by 566
Abstract
The hydrophobic modification effect and an appropriate cost of waterborne polyurethane are regularly pursued targets of researchers. To further enhance the hydrophobic modification effect of the terminal fluoroalkyl group and control the cost, a fluorine-containing pendant group diol (DEFA) was first synthesized by [...] Read more.
The hydrophobic modification effect and an appropriate cost of waterborne polyurethane are regularly pursued targets of researchers. To further enhance the hydrophobic modification effect of the terminal fluoroalkyl group and control the cost, a fluorine-containing pendant group diol (DEFA) was first synthesized by the Michael addition reaction of diethanolamine (DEOA) and dodecafluoroheptyl methacrylate (G04). Next, a series of modified polyurethane latexes (TPFPU) by the terminal fluoroalkyl segments (perfluorohexyl ethanol, S104) and the pendant fluoroalkyl segments (DEFA) were synthesized by varying the DEFA dosage. Structure and performance properties of the resultants were characterized by IR, 1H NMR, TEM, TGA, DSC, XRD, XPS, SEM, AFM and contact angle measurements. Results confirmed that the product could be successfully prepared using the present method. With the increase in DEFA dosage, the average particle size increased gradually. Thermal stability was enhanced and small regional crystals were probably produced. XPS and AFM results demonstrated that the degree of microphase separation and film roughness were increased with the increase in DEFA amount. Hydrophobicity of the TPFPU’s film was also increased with the increase in DEFA dosage, and it could be guaranteed when the mass content of S104 and DEFA was larger than 17.0 wt% in total mass of raw materials, which demonstrates that the terminal and pendant fluoroalkyl groups have the favorable synergistic effect on the properties of polyurethane. Full article
(This article belongs to the Special Issue Recent Advances in Superhydrophobic and Icephobic Surfaces)
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