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Superhydrophobic Coatings, 2nd Edition
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Superhydrophobic Coatings, 2nd Edition

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: 15 October 2025 | Viewed by 1773

Special Issue Editor

Prof. Dr. Ioannis Karapanagiotis

E-Mail Website
Guest Editor
Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: cultural heritage; antimicrobial; pigment; dye; superhydrophobic; superoleophobic
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to invite submissions to this Special Issue on the subject of superhydrophobic coatings. This is a continuation of a successful previous Issue (https://www.mdpi.com/journal/coatings/special_issues/superhydrophobic_coat).

Bioinspired surfaces with special wetting properties, which range from superhydrophobicity to superhydrophilicity and from superoleophobicity to superoleophilicity, have attracted considerable attention. Among these, supehydrophobic surfaces, which can be either water-repellent or water-adhesive, stand out due to their diverse potential applications.

Hundreds of different methods have been devised and applied in order to produce hierarchically structured, superhydrophobic surfaces such, as sol–gel, controlled nanoparticle embedding into polymer matrices (composites), wet chemical reactions, electrochemical deposition, plasma etching, chemical vapor deposition, lithography, electrospinning, solution immersion, emulsion, and so on.

Superhydrophobic coatings have numerous applications. Topics of interest include, but are not limited to, the following:

  • Agriculture and food packaging;
  • Anti-biofouling;
  • Anti-fogging and anti-smudge;
  • Anti-microbial;
  • Anti-sticking, anti-contamination;
  • Energy efficiency in heat transfer systems;
  • Friction and drag reduction;
  • Lab-on-a-chip devices;
  • Medical and biomedical uses;
  • Membranes, e.g., water harvesting, water cleaning, oil–water separation;
  • Metal refining;
  • Microfluidics;
  • Multifunctional coatings;
  • Self-cleaning;
  • Stain-resistant textiles (and other surfaces);
  • Waterproofing and anti-corrosion methods.

Contributions addressing these areas—including advancements in the fabrication techniques, characterization, and new applications of superhydrophobic coatings—are highly encouraged.

Prof. Dr. Ioannis Karapanagiotis
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 2600 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

  • superhydrophobic surfaces and coatings
  • water-repellent surfaces and coatings
  • superoleophobic surfaces and coatings
  • oil-repellent surfaces and coatings
  • anti-biofouling

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Published Papers (2 papers)

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16 pages, 2594 KiB  
Article
A Highly Hydrophobic Siloxane-Nanolignin Coating for the Protection of Wood
by Mariana M. M. Ramos, Christina P. Pappa, Panagiotis N. Manoudis, Vasiliki Kamperidou, Eleni Pavlidou, Vasilios Tsiridis, Maria Petala, Konstantinos S. Triantafyllidis, Panagiotis K. Spathis and Ioannis Karapanagiotis
Coatings 2025, 15(3), 293; https://doi.org/10.3390/coatings15030293 - 2 Mar 2025
Viewed by 923
Abstract
Wood, a vital material for both modern and heritage objects, is particularly susceptible to degradation caused by water due to its hydrophilic nature and porous structure. Therefore, developing sustainable strategies to protect wood is of significant importance. This study aims to produce a [...] Read more.
Wood, a vital material for both modern and heritage objects, is particularly susceptible to degradation caused by water due to its hydrophilic nature and porous structure. Therefore, developing sustainable strategies to protect wood is of significant importance. This study aims to produce a highly hydrophobic coating for the protection of wood following a straightforward procedure and using materials that are compatible with wood. First, nano/sub-microlignin (NL) is isolated and produced from beech wood through a one-step tailored organosolv process. Next, NL is incorporated into Sivo 121, a water-borne and solvent-free silane system recommended by the manufacturer for protecting wood surfaces. Composite coatings containing various concentrations of NL and Sivo 121 are applied to chestnut (Castanea spp.) and oak (Quercus spp.). The impact of NL concentration on the contact angles of water drops (CAs) and colour changes (ΔE) of the treated wood specimens is investigated. The coating with 4% w/w NL demonstrates enhanced hydrophobicity (CA = 145°) and has a negligible effect on the colour of pristine oak (ΔE < 3). The wetting properties of coated oak are not affected after 100 tape peeling cycles. However, the coating exhibits poorer performance on chestnut, i.e., CA = 135°, which declines after 80 peeling cycles, and ΔE > 5. The drop pH does not have any noticeable effect on CA. The latter remains stable even after prolonged exposure of coated oak and chestnut samples to artificial UV radiation and outdoor environmental conditions. Finally, the composite coating offers good and comparable protection for both wood species in the biological durability soil burial test Full article
(This article belongs to the Special Issue Superhydrophobic Coatings, 2nd Edition)
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18 pages, 11860 KiB  
Article
Composite Treatment of Mortar Through Nano-Ion-Based Capillary Crystalline and Silane Hydrophobic Processing to Enhance Its Corrosion Resistance in the Cl−-Contained Environment
by Quan Hua, Changyun Wu, Yangshun Zhu, Haoyu Wang, Guowei Wang, Shuguang Zhang and Dan Song
Coatings 2025, 15(3), 278; https://doi.org/10.3390/coatings15030278 - 26 Feb 2025
Viewed by 662
Abstract
The inherent porous structure of concrete enables the penetration of water and Cl− ions through its pores, which eventually leads to rebar corrosion within the concrete. Consequently, the densification and impermeability of concrete protective layers play a critical role in the durability [...] Read more.
The inherent porous structure of concrete enables the penetration of water and Cl− ions through its pores, which eventually leads to rebar corrosion within the concrete. Consequently, the densification and impermeability of concrete protective layers play a critical role in the durability of reinforced concrete structures. This study proposes a composite anti-corrosion treatment for mortar protective layers by integrating nano-ion capillary crystalline with silane hydrophobic processing. Targeting existing mortar samples, a series of experiments were conducted, utilizing scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), differential scanning calorimetry-thermogravimetry (DSC-TG), X-ray computed tomography (X-CT), contact angle measurements, permeability tests, and electrochemical tests. These experiments systematically evaluated the effects of composite anti-corrosion treatment on the microstructure of hydration products, pore characteristics, surface hydrophobicity, impermeability, and the overall corrosion resistance of mortar-rebar samples in a Cl−-contained environment. The results reveal that nano-ion capillary crystalline materials react with free calcium ions in the mortar to produce secondary hydration products, effectively filling micro-pores, densifying the pore structure and inhibiting the invasion of Cl− ions. The combination of capillary crystalline and silane hydrophobic processing synergistically enhances surface hydrophobicity and impermeability, preventing the ingress of corrosive agents, such as Cl− ions, and significantly improving the anti-corrosion performance of mortar in a Cl−-contained environment. Full article
(This article belongs to the Special Issue Superhydrophobic Coatings, 2nd Edition)
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