Self-cleaning and anti-fouling superhydrophobic hierarchical ceramic surface synthesized from hydrothermal and fluorination methods

Aziz, Mustafa Kamal Abdul; Othman, Mohd Hafiz Dzarfan; Tavares, Jason Robert; Pauzan, Mohammad Arif Budiman; Tenjimbayashi, Mizuki; Lun, A; Alias, Nur Hashimah; Ismail, Ahmad Fauzi; Rahman, Mukhlis A.

doi:10.1016/j.apsusc.2022.153702

Cited by 22 publications

(9 citation statements)

References 48 publications

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“…According to eqs 2 and 3 , slip length is predicted to be linearly proportional to the thickness of the air layer ( l air ) at a given viscosity ratio (μ l /μ air ). Since liquids with relatively lower surface tension can enter the microstructure of SHO surfaces more easily 20 and the meniscus/stability of the air pockets is dependent primarily on the surface tension 48 (or, in nondimensional terms, the capillary number 49 ) of the liquid, we make the assumption that the surface tension of a liquid has a positive relationship with l air . Therefore, the slip length is assumed to be linearly proportional to the so-called capillary length (λ c ) which is determined by mass density and surface tension as where γ is the surface tension of the liquid, ρ the mass density of the liquids, and g the gravitational acceleration.…”

Section: Resultsmentioning

confidence: 99%

Surface Tension and Viscosity Dependence of Slip Length over Irregularly Structured Superhydrophobic Surfaces

2022

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A comprehensive understanding of the slip phenomenon on liquid/solid interfaces is essential for multiple real-world applications of superhydrophobic materials, especially those involving drag reduction. In the current contribution, the so-called “slip-length” on an irregularly structured superhydrophobic surface was systematically evaluated, with respect to varying liquid surface tension and viscosity. The superhydrophobic polymer–nanoparticle composite (SPNC) material used exhibits a dual-scale surface roughness and was fabricated via coating a surface with a mixture of polydimethylsiloxane solution and functionalized silica particles. A cone-and-plate rheometric device was employed to quantify the slip length. To independently study the impact of surface tension and viscosity, three types of aqueous solutions were used: sodium dodecyl sulfate, ethanol, and polyethylene glycol. Our experimental results demonstrate that a decreasing surface tension results in a decreasing slip length when the fluid viscosity is held constant. Meanwhile, the slip length is shown to increase with increasing viscosity when the surface tension of the various liquids is matched to isolate effects. The study reveals a linear relationship between slip length and both capillary length and viscosity providing a reference to potentially predict the degree of achievable drag reduction for differing fluids on SPNC surfaces.

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Section: Resultsmentioning

confidence: 99%

Surface Tension and Viscosity Dependence of Slip Length over Irregularly Structured Superhydrophobic Surfaces

2022

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“…The hydrothermal method [ 40 , 41 ] involves the reaction of insoluble substances to produce crystals in a high-temperature, high-pressure environment with an aqueous solution as the reaction medium. The hydrothermal method is suitable for the preparation of hydrophobic materials on a large scale, with inexpensive and simple reaction conditions.…”

Section: The Preparation Of Superhydrophobic Coatings On Woodmentioning

confidence: 99%

Recent Advances in Superhydrophobic Surfaces and Applications on Wood

Wei

Niu

2023

Polymers

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Superhydrophobic substances were favored in wood protection. Superhydrophobic treatment of wood is of great significance for improving the service life of wood and expanding its application fields, such as improving dimensional stability, durability, UV stability, and reducing wetting. The superhydrophobic phenomenon is attributed to the interaction of micro/nano hierarchical structure and low surface energy substances of the wood surface. This is the common method for obtaining superhydrophobic wood. The article introduces the common preparation methods of superhydrophobic wood material coatings and their mechanisms. These techniques include lithography, sol–gel methods, graft copolymerization, chemical vapor deposition, etc. The latest research progress of superhydrophobic wood material coatings application at domestic and overseas is reviewed, and the current status of superhydrophobic coating application in wood materials and construction is summarized. Finally, superhydrophobic on wood in the field of applied research is presented, and the development trend in the field of functional improvement of wood is foreseen.

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“…Artificial superhydrophobic, SHP, materials with sufficient surface roughness and low surface energy have successfully been produced inspired by the lotus effect 1 , 2 . SHP surfaces with water contact angles more than 150° and water slide angles less than 10° have acquired extensive attention due to their vast array of potential uses, such as anticorrosion 3 , oil–water separation 4 , self-cleaning 5 , anti-icing 6 , antifouling 7 , biomedicine 8 , and drag reduction 9 . Various methods were utilized to manufacture bio-inspired SHP surfaces, including chemical vapor deposition 10 , chemical etching 11 , 3D printing 12 , sol-gel 13 , electrospinning 14 , anodization 15 , spraying 16 , and electrodeposition 17 .…”

Section: Introductionmentioning

confidence: 99%

Construction of superhydrophobic graphene-based coating on steel substrate and its ultraviolet durability and corrosion resistance properties

Mohamed

Mekhaiel

Mahgoub

2023

Sci Rep

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For the first time, a facile and environmentally friendly approach for producing high-quality graphene from the biomass of banana leaves is described in this paper. Two rough coats of Ni-graphene, Ni@G, and Ni-graphene doped with chromium, Ni@Cr-G, were created on steel substrates by electrostatic deposition. These coatings were then submerged in an ethanolic solution of myristic acid, MA, to produce a superhydrophobic, SHP, surface. The Raman spectra demonstrated that the generated graphene was of high quality. Fourier transform infrared spectroscopy findings confirm the modification of the Ni@G coating by MA, Ni@G@MA, and the modification of the Ni@Cr-G composite with MA, Ni@Cr-G@MA. The results of the scanning electron microscope revealed that the created SHP coatings have nanoscale features. The wettability results showed that the water contact angle values for Ni@G@MA and Ni@Cr-G@MA coatings are 158° and 168°, while the water sliding angle values for both coatings are 4.0 o and 1.0°, respectively. The atomic force microscopy results show that both Ni@G and Ni@Cr-G coatings increase the roughness of the steel. The chemical and mechanical stability of the Ni@Cr-G@MA coating was higher than those of the Ni@G@MA coating. The coated steel by Ni@Cr-G@MA exhibits UV stability up to 110 h, while the SHP-coated steel by Ni@G@MA exhibits UV stability for 60 h. The potentiodynamic polarization results show that the value of the corrosion current density for bare steel is 13 times that of steel coated with Ni@G@MA, and 21 times that of coated steel with Ni@Cr-G@MA. The electrochemical impedance spectroscopy, EIS, results show that the charge transfer resistance for steel coated with Ni@G@MA is 38 times that of bare steel, while steel coated with Ni@Cr-G@MA is 57 times that of bare steel. Potentiodynamic polarization and EIS results show that the SHP Ni@Cr-G@MA film exhibits higher corrosion resistance than Ni@G@MA film.

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Self-cleaning and anti-fouling superhydrophobic hierarchical ceramic surface synthesized from hydrothermal and fluorination methods

Cited by 22 publications

References 48 publications

Surface Tension and Viscosity Dependence of Slip Length over Irregularly Structured Superhydrophobic Surfaces

Surface Tension and Viscosity Dependence of Slip Length over Irregularly Structured Superhydrophobic Surfaces

Recent Advances in Superhydrophobic Surfaces and Applications on Wood

Construction of superhydrophobic graphene-based coating on steel substrate and its ultraviolet durability and corrosion resistance properties

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