Fast fabrication of superhydrophobic metallic surface using nanosecond laser texturing and low-temperature annealing

Chun, Doo‐Man; Ngo, Chi-Vinh; Lee, Kyong-Min

doi:10.1016/j.cirp.2016.04.019

Cited by 125 publications

(62 citation statements)

References 19 publications

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“…However, many previous studies have reported that just after laser ablation, the fresh ablated metal surface was hydrophilic or super-hydrophilic with the presence of micro/nanostructures. When the laser ablated surface was exposed to the ambient air for a relatively long time, the wettability transition from super-hydrophilic to super-hydrophobic could be observed [12][13][14][15][16][17][18][19][20]. Recent research efforts have been directed towards the explanation of the wettability transition mechanism.…”

Section: Introductionmentioning

confidence: 99%

Insights into the wettability transition of nanosecond laser ablated surface under ambient air exposure

Yang

Liu

Tian

2019

Journal of Colloid and Interface Science

221

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Super-hydrophobic surfaces are attractive due to self-cleaning and anti-corrosive behaviors in harsh environments. Laser texturing offers a facile method to produce super-hydrophobic surfaces. However, the results indicated that the fresh laser ablated surface was generally super-hydrophilic and then gradually reached super-hydrophobic state when exposed to ambient air for certain time. Investigating wettability changing mechanism could contribute to reducing wettability transition period and improving industrial productivity. To solve this problem, we have studied the bare aluminum surface, fresh laser ablated super-hydrophilic surface, 15-day air exposed surface, and the aged super-hydrophobic surface by time-dependent water contact angle (WCA) and rolling angle (RA), scanning electron microscopy (SEM), 3D profile and X-ray photoelectron spectroscopy (XPS). The origins of super-hydrophilicity of the fresh laser ablated surface are identified as (1) the formation of hierarchical rough structures and (2) the surface chemical modifications (the decrease of nonpolar carbon, the formation of hydrophilic alumina and residual unsaturated atoms). The chemisorbed nonpolar airborne hydrocarbons from air moisture contributed to the gradual super-hydrophobic transition, which can be proved by the thermal annealing experiment. Particularly, to clearly explore the wettability transition mechanism, we extensively discussed why the laser-induced freshly outer layer was super-hydrophilic and how the airborne hydrocarbons were chemisorbed. This work not only provides useful insights into the formation mechanism of laser ablated super-hydrophobic surfaces, but also further guides industry to effectively modify surface chemistry to reduce wettability transition period and rapidly produce stable and durable super-hydrophobic surfaces.

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Section: Introductionmentioning

confidence: 99%

Insights into the wettability transition of nanosecond laser ablated surface under ambient air exposure

Yang

Liu

Tian

2019

Journal of Colloid and Interface Science

221

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“…In addition, cuprous oxide was formed after heat treatment. Cuprous oxide is insoluble in water and is a hydrophobic substance, which also affects the surface wettability to a certain extent [33]. Some researchers studied the relationship between material surface wettability and material surface microstructure [34].…”

Section: Discussionmentioning

confidence: 99%

Hybrid Nanosecond Laser Processing and Heat Treatment for Rapid Preparation of Super-Hydrophobic Copper Surface

Wang

et al. 2019

Metals

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The super-hydrophobic copper surface was obtained by using a nanosecond pulsed laser. Different micro-and nano-structures were fabricated by changing the laser scanning interval and scanning speed, before heating in an electric heater at 150 • C for two hours to explore the effect of laser parameters and heat treatment on the wettability of the copper surface. It was found that the laser-treated copper surface is super-hydrophilic, and then, after the heat treatment, the surface switches to hydrophobic or even super-hydrophobic. The best super-hydrophobic surface's apparent contact angle (APCA) was 155.6 • , and the water sliding angle (WSA) was 4 • . Super-hydrophobic copper is corrosion-resistant, self-cleaning, and dust-proof, and can be widely used in various mechanical devices.In order to find the best super-hydrophobic metal surface, we should know the reasons behind certain materials being super-hydrophobic.A dense column micro-or nano-structure is the key factor causing a super-hydrophobic surface. Thus, when we look for a super-hydrophobic surface, micro-and nano-scale dense column structures, such as the microstructures of lotus leaves, bird feathers, and butterfly wings, are considered. Although there are many ways to fabricate the hybrid micro/nano-structure on the material surface, such as chemical vapor deposition, chemical etching, nano-imprint lithography, electrode position, etc., there are various problems in their application [8][9][10][11][12][13][14][15][16][17]. For example, the size of the micro/nano-structure formed by the chemical etching method is very sensitive to external conditions such as temperature and concentration of chemical solution. In addition, etching reagents are mostly corrosive reagents with safety and environmental issues. Unlike the above methods, lasers can fabricate and precisely control the size of micro/nano-structures [18][19][20][21][22][23]. Therefore, laser processing can be used to quickly obtain micro/nano-structures. Recent studies found that the surfaces of metal oxides and nanostructures formed by laser ablation are initially hydrophilic or even super-hydrophilic; however, over time, they become hydrophobic, and sometimes even super-hydrophobic in air after two weeks to two months [24]. Several mechanisms were proposed to explain this phenomenon. Chang et al. proposed that the deoxidation of copper oxide could effectively promote the development from a hydrophilic to a super-hydrophobic surface [25,26]. Boinovich et al. believed that metal oxides adsorbed organics in the air, resulting in the transition from a super-hydrophilic to super-hydrophobic surface [27,28]. It can be seen that, although most researchers extensively studied this topic, there is obvious controversy regarding the mechanism of the wettability transition behavior.In this paper, a rapid method of fabricating a super-hydrophobic surface on a copper plate was studied. Micro/nano-structures were fabricated on copper surfaces by laser ablation, which then became super-hydrophobic after heat t...

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“…Among above mentioned materials, it is well considered that metallic surfaces are widely utilized in various applications, for example, heating/cooling pipes, ship-buildings and outdoor structures [21] .…”

mentioning

confidence: 99%

Hybrid Laser Ablation and Chemical Modification for Fast Fabrication of Bio-inspired Super-hydrophobic Surface with Excellent Self-cleaning, Stability and Corrosion Resistance

2019

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Fast fabrication of superhydrophobic metallic surface using nanosecond laser texturing and low-temperature annealing

Cited by 125 publications

References 19 publications

Insights into the wettability transition of nanosecond laser ablated surface under ambient air exposure

Insights into the wettability transition of nanosecond laser ablated surface under ambient air exposure

Hybrid Nanosecond Laser Processing and Heat Treatment for Rapid Preparation of Super-Hydrophobic Copper Surface

Hybrid Laser Ablation and Chemical Modification for Fast Fabrication of Bio-inspired Super-hydrophobic Surface with Excellent Self-cleaning, Stability and Corrosion Resistance

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