Recent Advances in Hydrophobic Coatings

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

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 3392

Special Issue Editor

Department of Materials Engineering, Composites Research Network, The University of British Columbia, Vancouver, BC, Canada
Interests: coatings; hydrophobicity; water resistance; materials science; surface engineering; roughness; nanoparticles; surfactants; sol–gel; composites; biobased; polymers; cellulose

Special Issue Information

Dear Colleagues,

We would like to invite you to submit your work for this Special Issue, “Recent Advances in Hydrophobic Coatings”. Surface functionalization through the deposition of coatings can have beneficial impacts on the substrate. Providing hydrophobicity to materials can widen their scope in numerous applications and improve their compatibility with polymers for developing strong durable composites. These materials have applications in the fields of science, engineering and medicine. The majority of hydrophobic and superhydrophobic surfaces are created by the deposition of low surface energy chemicals, although enhancing the surface roughness can have a synergistic effect on the hydrophobic properties of substrates. Hydrophobic coatings have been successfully fabricated using various approaches and have substantially improved substrate durability and performance. This issue welcomes research on waterproof coatings prepared by different processes and their deposition on a variety of substrates, such as bio-based materials, cellulose, ceramics, and metals.

The scope of this Special Issue will serve as a forum for papers based on, but not limited to, the following topics:

  • Experimental research on hydrophobic, waterproof and water-resistant coatings.
  • Recent advancements in multi-functional organic, inorganic, hybrid and self-cleaning coatings
  • Coatings produced by different processes, including, but not limited, to sol-gel, plasma processing, CVD, and in situ additive manufacturing.
  • Understanding coating durability and degradation through friction, wear, weathering UV, corrosion, etc.

Dr. Atif Hussain
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

  • hydrophobicity and self cleaning
  • water-resistant and waterproof coatings
  • durability
  • surface engineering and functionalization

Published Papers (2 papers)

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Research

11 pages, 7278 KiB  
Article
Wetting Patterns of Liquid-Repellent Femtosecond Laser Textured Aluminum Surfaces
by Oleksiy Myronyuk, Denys Baklan, Georgii S. Vasilyev, Aleksej M. Rodin and Egidijus Vanagas
Coatings 2022, 12(12), 1852; https://doi.org/10.3390/coatings12121852 - 29 Nov 2022
Cited by 6 | Viewed by 1473
Abstract
Although liquid-repellent surfaces are in demand in many applications, their use is limited by the Cassie state’s sustainability to environmental factors, such as the repellency of liquids with a surface tension lower than that of water. This phenomenon remains not fully understood, despite [...] Read more.
Although liquid-repellent surfaces are in demand in many applications, their use is limited by the Cassie state’s sustainability to environmental factors, such as the repellency of liquids with a surface tension lower than that of water. This phenomenon remains not fully understood, despite a well-developed theory. In the current work, wetting of femtosecond laser-textured aluminum surfaces for probe liquids with a surface tension of 72.8–21.2 mN/m was considered. The resulting patterns were an array of pillars at the micro level and fractal-like structures at the nano level. These structured surfaces were treated with alkoxysilanes and oleic acid. All textured samples exhibited a Cassie state with water, and contact angles greater than 150° were achieved with silane-treated surfaces. A decrease in the surface tension of the probe liquid led to а transition to the Wetzel state at 44–46 mN/m for alkoxysilanes and at 52 mN/m for oleic acid. A typical shape of the textured surface wetting curve is proposed. It was shown that the determined values of the surface tension of the Cassie-Wenzel transition were 10–15 mN/m lower than those predicted by the Cassie equations. Full article
(This article belongs to the Special Issue Recent Advances in Hydrophobic Coatings)
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12 pages, 9238 KiB  
Article
Robust Superhydrophobic Coating with Mullite Fiber Framework
by Wensheng Zhong, Shilin Hu, Manyuan Wu, Bichen Xiong, Qiaowen Liu, Qingqing Jia, Yaming Liu and Hongwei Liao
Coatings 2022, 12(7), 1037; https://doi.org/10.3390/coatings12071037 - 21 Jul 2022
Viewed by 1246
Abstract
Superhydrophobic surfaces have received increasing attention due to their excellent water repellency, but the fragile stability of superhydrophobic coatings has been a huge hindrance to their applications. In this work, we constructed a layer of mullite fibers on the surface of a ceramic [...] Read more.
Superhydrophobic surfaces have received increasing attention due to their excellent water repellency, but the fragile stability of superhydrophobic coatings has been a huge hindrance to their applications. In this work, we constructed a layer of mullite fibers on the surface of a ceramic substrate using high-temperature molten salt. Then, we obtained a superhydrophobic surface with a contact angle greater than 150° via soaking the sample with an alcoholic sol containing modified particles. On the one hand, this interlaced three-dimensional fiber structure increases the surface area and roughness, providing more locations for attaching superhydrophobic particles, as well as improving the water repellency. On the other hand, this fiber layer has a height difference, which protects the superhydrophobic particles attached at lower positions, and when an external object contacts the surface, it gives priority to the stable mullite fibers, reducing the direct contact between superhydrophobic particles and external objects and improving the stability of the superhydrophobic coating. After abrasion with sandpaper, the sample with the mullite fiber layer showed excellent stability compared to the samples without the fiber layer, indicating the significant protective effect of the fiber layer. This paper provides a potential method to enhance the stability of superhydrophobic ceramic surfaces. Full article
(This article belongs to the Special Issue Recent Advances in Hydrophobic Coatings)
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