Super-hydrophobic and Super-hydrophilic Effect by Means of EDM Surface Structuring of γ-TiAl

Kliuev, Mikhail; Wiessner, Moritz; Büttner, H.; Maradia, Umang; Wegener, Konrad

doi:10.1016/j.procir.2020.02.332

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…To potentially fabricate high-performance super hydrophobic surface, Zhang et al [ 87 ] proposed a novel micro machining technique, magnetically controlled ultrashort pulsed laser induced plasma micro-machining. Kliuev et al [ 88 ] compared the microstructure of the γ-TiAl surface processed by WEDM and die-sinking EDM, and found that these processes can be used as industrial solutions for the generation of superhydrophobic and superhydrophilic surfaces. Due to its impact on the environment, electrochemical machining [ 89 , 90 ] is considered to be a non-traditional machining method that is not friendly to the environment, requiring the recovery and harmless treatment of the waste electrolyte.…”

Section: Discussionmentioning

confidence: 99%

Progress in Non-Traditional Processing for Fabricating Superhydrophobic Surfaces

Shen¹,

Ming

Ren

et al. 2021

Micromachines

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When the water droplets are on some superhydrophobic surfaces, the surface only needs to be inclined at a very small angle to make the water droplets roll off. Hence, building a superhydrophobic surface on the material substrate, especially the metal substrate, can effectively alleviate the problems of its inability to resist corrosion and easy icing during use, and it can also give it special functions such as self-cleaning, lubrication, and drag reduction. Therefore, this study reviews and summarizes the development trends in the fabrication of superhydrophobic surface materials by non-traditional processing techniques. First, the principle of the superhydrophobic surfaces fabricated by laser beam machining (LBM) is introduced, and the machining performances of the LBM process, such as femtosecond laser, picosecond laser, and nanosecond laser, for fabricating the surfaces are compared and summarized. Second, the principle and the machining performances of the electrical discharge machining (EDM), for fabricating the superhydrophobic surfaces, are reviewed and compared, respectively. Third, the machining performances to fabricate the superhydrophobic surfaces by the electrochemical machining (ECM), including electrochemical oxidation process and electrochemical reduction process, are reviewed and grouped by materials fabricated. Lastly, other non-traditional machining processes for fabricating superhydrophobic surfaces, such as ultrasonic machining (USM), water jet machining (WJM), and plasma spraying machining (PSM), are compared and summarized. Moreover, the advantage and disadvantage of the above mentioned non-traditional machining processes are discussed. Thereafter, the prospect of non-traditional machining for fabricating the desired superhydrophobic surfaces is proposed.

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Section: Discussionmentioning

confidence: 99%

Progress in Non-Traditional Processing for Fabricating Superhydrophobic Surfaces

Shen¹,

Ming

Ren

et al. 2021

Micromachines

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“…This increased hydrophilicity can be explained with the Wenzel model, which applies to a fully wetted surface under the droplet. This model states that a roughness factor (f ) greater than 1 results in the real surface in contact with the liquid Ar being greater than the projected surface Ap, leading to an increase in wettability, and consequently a lower contact angle [36] (Figure 8). factor (𝑓) greater than 1 results in the real surface in contact with the liquid 𝐴𝑟 being greater than the projected surface 𝐴𝑝, leading to an increase in wettability, and consequently a lower contact angle [36] (Figure 8).…”

Section: Wettability and Surface-free Energy (Sfe)mentioning

confidence: 99%

“…This model states that a roughness factor (f ) greater than 1 results in the real surface in contact with the liquid Ar being greater than the projected surface Ap, leading to an increase in wettability, and consequently a lower contact angle [36] (Figure 8). factor (𝑓) greater than 1 results in the real surface in contact with the liquid 𝐴𝑟 being greater than the projected surface 𝐴𝑝, leading to an increase in wettability, and consequently a lower contact angle [36] (Figure 8). This increased wettability would possibly improve protein adhesion and the healing process, as well as implant integration.…”

Section: Wettability and Surface-free Energy (Sfe)mentioning

confidence: 99%

Improvement of Metal-Doped β-TCP Scaffolds for Active Bone Substitutes via Ultra-Short Laser Structuring

Soares,

Sotelo,

Erceg

et al. 2023

Bioengineering

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Various efforts have been made to develop antibacterial biomaterials capable of also sustaining bone remodulation to be used as bone substitutes and reduce patient infection rates and related costs. In this work, beta-tricalcium phosphate (β-TCP) was chosen due to its known biocompatibility and use as a bone substitute. Metal dopants were incorporated into the crystal structure of the β-TCP, and disks were produced from this material. Magnesium and strontium, as well as copper and silver, were chosen as dopants to improve the osteogenic and antibacterial properties, respectively. The surface of the β-TCP samples was further modified using a femtosecond laser system. Grid and line patterns were produced on the plates’ surface via laser ablation, creating grooves with depths lower than 20 μm and widths between 20 and 40 μm. Raman and FTIR analysis confirmed that laser ablation did not result in the degradation or phase change of the materials, making it suitable for surface patterning. Laser ablation resulted in increased hydrophilicity of the materials, as the control samples (non-ablated samples) have WCA values ranging from 70° to 93° and become, upon laser ablation, superwicking surfaces. Confocal measurements show an increase in specific surface area of 50% to 200% compared to the control. Overall, the results indicate the potential of laser ablation to improve the surface characteristics of β-TCP, which may lead to an improvement in the antibacterial and osteogenic properties of the produced materials.

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“…It can be found that the dust particles on the panel with superhydrophobic coating are less and the diameter of the deposited dust particles does not exceed 20 µm, which is also much smaller than the diameter of the clean glass. The results show that it is difficult for large particles to be deposited on the superhydrophobic surface due to the low adsorption energy [8,99,100]. Pan et al [101] proposed the introduction of a rough surface discretization model to solve the particle-rough surface adhesive contact force problem.…”

Section: Super-hydrophobic Coatingmentioning

confidence: 99%

A Review of Dust Deposition Mechanism and Self-Cleaning Methods for Solar Photovoltaic Modules

Quan

Zhao

et al. 2022

Coatings

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Large-scale solar photovoltaic (PV) power plants tend to be set in desert areas, which enjoy high irradiation and large spaces. However, due to frequent sandstorms, large amounts of contaminants and dirt are suspended in the air and deposited on photovoltaic modules, which greatly decreases the power efficiency and service life. To clean PV to improve efficiency, many methods were proposed. It was found that the application of the self-cleaning coating on PV modules can effectively reduce dust deposition and improve the efficiency of PV. This paper reviews the dust deposition mechanism on photovoltaic modules, classifies the very recent dust removal methods with a critical review, especially focusing on the mechanisms of super-hydrophobic and super-hydrophilic coatings, to serve as a reference for researchers and PV designers, and presents the current state of knowledge of the aspects mentioned above to promote sustainable improvement in PV efficiency. It was found that the behaviors of dust on photovoltaic modules are mainly deposition, rebound, and resuspension. Particles with a diameter of 1–100 μm are most easily deposited on photovoltaic modules. The use of self-cleaning coatings, especially super-hydrophobic coatings, is beneficial to the rebound and resuspension of particles. The research gaps and development prospects of self-cleaning coatings are also discussed in this paper.

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Super-hydrophobic and Super-hydrophilic Effect by Means of EDM Surface Structuring of γ-TiAl

Cited by 8 publications

References 15 publications

Progress in Non-Traditional Processing for Fabricating Superhydrophobic Surfaces

Progress in Non-Traditional Processing for Fabricating Superhydrophobic Surfaces

Improvement of Metal-Doped β-TCP Scaffolds for Active Bone Substitutes via Ultra-Short Laser Structuring

A Review of Dust Deposition Mechanism and Self-Cleaning Methods for Solar Photovoltaic Modules

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