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Coatings
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Hydrophobic, Superhydrophobic, and Oleophobic Surfaces: Durability and Applications
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Hydrophobic, Superhydrophobic, and Oleophobic Surfaces: Durability and Applications

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 (31 October 2020) | Viewed by 10217

Special Issue Editors

Dr. Frank L. Palmieri

E-Mail Website
Guest Editor
NASA Langley Research Center, Hampton, United States
Interests: adhesion; polymer matrix composites; structural bonding; surface characterization; surface preparation; laser machining; thermal analysis; process simulation
Special Issues, Collections and Topics in MDPI journals
Dr. Christopher J Wohl

E-Mail Website
Guest Editor
NASA Langley Research Center, Hampton, United States
Interests: surface engineering; polymer chemistry; composite materials; additive manufacturing; self-assembly; colloids

Special Issue Information

Dear Colleagues,

You are invited to contribute to this Special Issue of Coatings on the durability and stability of hydrophobic, superhydrophobic, and oleophobic surfaces. The generation of anti-wetting materials and surfaces has become prolific in recent years. Novel surface engineering techniques span the gamut of disciplines from controlled precipitation to lithography to self-assembly. Although the properties of these surfaces, as prepared, can be stunning, their performance after extended application or exposure to adverse conditions is rarely addressed. Cyclic wetting experiments, controlled or random abrasion processes, and other methods that would emulate operational conditions or environmental exposure can all affect the wetting behavior of engineered surfaces. In this issue, the emphasis is on the retention anti-wetting behavior and measured changes in wetting properties after surfaces have been subjected to real or simulated exposure and wear.

Dr. Frank L. Palmieri
Dr. Christopher J Wohl
Guest Editors

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
  • Oleophobicity
  • Property retention
  • Abrasion resistance

Published Papers (3 papers)

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Research

7 pages, 1354 KiB  
Communication
SiO2-Based Nanostructured Superhydrophobic Film with High Optical Transmittance
by Algirdas Lazauskas, Dalius Jucius, Linas Puodžiukynas, Asta Guobienė and Viktoras Grigaliūnas
Coatings 2020, 10(10), 934; https://doi.org/10.3390/coatings10100934 - 29 Sep 2020
Cited by 9 | Viewed by 2219
Abstract
Superhydrophobic and transparent films would be very useful in optoelectronic applications where non-wetting is desired. Herein, hexamethyldisilazane was used for functionalization of fumed SiO2 nanoparticles via silylation derivatization reaction. Modified fumed SiO2 nanoparticle dispersion was used for fabrication of SiO2 [...] Read more.
Superhydrophobic and transparent films would be very useful in optoelectronic applications where non-wetting is desired. Herein, hexamethyldisilazane was used for functionalization of fumed SiO2 nanoparticles via silylation derivatization reaction. Modified fumed SiO2 nanoparticle dispersion was used for fabrication of SiO2-based nanostructured film via drop-casting method. This film exhibited a combination of high optical transmittance in the visible spectrum portion and superhydrophobicity (163° ± 1° and hysteresis as low as ~2°). This was possible to achieve due to the submicrometer-scale roughness (Rq = 252.7 nm) and branched network structure of the film surface with convenient surface chemistry of hydrophobic methyl groups. The method reported herein is not complicated, allows for obtaining large quantities of modified SiO2 nanoparticle dispersions and can be used in combination with other deposition methods. Full article
(This article belongs to the Special Issue Hydrophobic, Superhydrophobic, and Oleophobic Surfaces: Durability and Applications)
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Graphical abstract

13 pages, 2911 KiB  
Article
Fabrication of Superhydrophobic Wood Surface by Etching Polydopamine Coating with Sodium Hydroxide
by Zede Yi, Bo Zhao, Murong Liao and Zhiyong Qin
Coatings 2020, 10(9), 847; https://doi.org/10.3390/coatings10090847 - 31 Aug 2020
Cited by 16 | Viewed by 3533
Abstract
Superhydrophobic treatment of wood surfaces can effectively prevent the contact between the external moisture and wood, which improves the service life of the wood. In this study, different rough surfaces of wood were constructed, derived from the self-polymerization of dopamine (DA) in weak [...] Read more.
Superhydrophobic treatment of wood surfaces can effectively prevent the contact between the external moisture and wood, which improves the service life of the wood. In this study, different rough surfaces of wood were constructed, derived from the self-polymerization of dopamine (DA) in weak base solution to form a polydopamine (PDA) coating and the deprotonation of the PDA coating in a strong base solution. Furthermore, octadecyltrichlorosilane (OTS) was used as a low-surface-free-energy agent to modify rough surface in order to prepare superhydrophobic woods: Wood@PDA–NaOH–OTS and the Wood@PDA–NaOH/SiO2–OTS. The contact angles (CAs) and sliding angles (SAs) of the resulting superhydrophobic woods were tested. The results showed that the CA and SA of the Wood@PDA–NaOH–OTS were 151° and 4.8°, respectively; the CA and SA of the Wood@PDA–NaOH/SiO2–OTS were 155.1° and 5.0°, respectively. Surface electron microscopy (SEM) images presented that NaOH successfully etched the PDA coating, and the roughness was further improved by adding nano-SiO2. Atomic force microscope images (AFM) revealed that the nano-SiO2 particles could effectively provide nanolevel roughness, which was beneficial to the wood’s superhydrophobic properties. In addition, the obtained superhydrophobic wood possessed strong surface stability and anti-loss property, as well as resistance to acid-base solution and organic solvent. Full article
(This article belongs to the Special Issue Hydrophobic, Superhydrophobic, and Oleophobic Surfaces: Durability and Applications)
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18 pages, 8635 KiB  
Article
Reducing Static and Impact Ice Adhesion with a Self-Lubricating Icephobic Coating (SLIC)
by Edem Tetteh and Eric Loth
Coatings 2020, 10(3), 262; https://doi.org/10.3390/coatings10030262 - 11 Mar 2020
Cited by 20 | Viewed by 4021
Abstract
Ice accumulation and adhesion can problematically occur on many engineering systems, such as electrical power networks, wind turbines, communication towers, and aircraft. An optional solution to these icing problems is the use of surfaces/coatings with low ice adhesion properties: Icephobic surfaces. Icephobic surfaces/coatings [...] Read more.
Ice accumulation and adhesion can problematically occur on many engineering systems, such as electrical power networks, wind turbines, communication towers, and aircraft. An optional solution to these icing problems is the use of surfaces/coatings with low ice adhesion properties: Icephobic surfaces. Icephobic surfaces/coatings are very beneficial, as they facilitate the removal of ice or retard its formation and do not require the use of any sort of energy. A compact icing research tunnel (CIRT) was employed to measure ice tensile adhesion strength for both impact and static ice on a conventional metal surface (aluminum) and on a Self-Lubricating Icephobic Coating (SLIC) surface. The static ice consisted of deionized water slowly poured over the surface and left to be frozen on the test specimen surface at stationary conditions, while impact ice consisted of droplets of mean volumetric diameter (MVD) of 13 μm impacting the test specimen surface at a velocity of 40 m/s and freezing and accreting dynamically. The results revealed that static ice has an ice tensile adhesion stress higher than that of impact ice for the conditions used, consistent with previous studies. Additionally, a reduction of more than half was observed in ice tensile adhesion stress for SLIC compared to aluminum for both impact and static ice, and this performance stayed consistent even after multiple icing tests on the same sample. The SLIC coating hydrophobicity (roll-off angle and contact angle) also demonstrated resilience to icing and mechanical abrasion, confirming the self-healing properties. Full article
(This article belongs to the Special Issue Hydrophobic, Superhydrophobic, and Oleophobic Surfaces: Durability and Applications)
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