Comment on “Nanosecond laser textured superhydrophobic metallic surfaces and their chemical sensing applications” by Duong V. Ta, Andrew Dunn, Thomas J. Wasley, Robert W. Kay, Jonathan Stringer, Patrick J. Smith, Colm Connaughton, Jonathan D. Shephard (Appl. Surf. Sci. 357 (2015) 248–254)

Бойнович, Л. Б.; Emelyanenko, Alexandre M.; Emelyanenko, Kirill A.; Domantovsky, A. G.; Shiryaev, А. A.

doi:10.1016/j.apsusc.2016.04.056

Cited by 88 publications

(33 citation statements)

References 8 publications

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“… 7 − 10 However, this regime is not stable and the superhydrophilic-to-superhydrophobic transition usually occurs over the course of several weeks or months if these surfaces are exposed to atmospheric air. 2 , 6 , 15 , 17 Although the underlying mechanisms for this transition are still under debate, 18 several experimental observations 5 , 19 − 22 convincingly endorse contamination as one of the most likely reasons.…”

Section: Influence Of the Low-temperature Annealing On The Wettabilitmentioning

confidence: 99%

“…From the existing literature, it also follows that (super)hydrophilic-to-(super)hydrophobic transition under ambient conditions happens on a multitude of laser-textured metals and metal alloys with different chemical and catalytic activity as well as different crystallographic structure. 18 The samples in these studies were textured by a wide range of laser-pulse durations, including nanosecond, 6 , 7 , 16 , 17 , 27 picosecond, 20 and femtosecond pulses. 2 , 15 Moreover, a similar transition has been observed on surfaces oxidized by oxygen plasma treatment, 28 reactive magnetron sputtering, 29 and even ionizing (gamma) radiation.…”

Section: Influence Of the Low-temperature Annealing On The Wettabilitmentioning

confidence: 99%

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Comment on “Bioinspired Reversible Switch between Underwater Superoleophobicity/Superaerophobicity and Oleophilicity/Aerophilicity and Improved Antireflective Property on the Nanosecond Laser-Ablated Superhydrophobic Titanium Surfaces”

Gregorčič

2020

ACS Appl. Mater. Interfaces

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Laser-textured surfaces enabling reversible wettability switching and improved optical properties are gaining importance in cutting-edge applications, including self-cleaning interfaces, tunable optical lenses, microfluidics, and lab-on-chip systems. Fabrication of such surfaces by combining nanosecond-laser texturing and low-temperature annealing of titanium Ti-6Al-4V alloy was demonstrated by Lian et al. in ACS Appl. Mater. Inter . 2020 , 12 (5), 6573–6580. However, it is difficult to agree with (i) their contradictory explanation of the wettability transition due to low-temperature annealing and (ii) their theoretical description of the optical behavior of the laser-textured titanium surface. This comment provides an alternative view—supported by both experimental results and theoretical investigation—on how the results by Lian et al. could be interpreted more correctly. The annealing experiments clarify that controlled contamination is crucial in obtaining consistent surface wettability alterations after low-temperature annealing. Annealing of laser-textured titanium at 100 °C in contaminated and contaminant-free furnaces leads to completely different wettability transitions. Analysis of the surface chemistry by XPS and ToF-SIMS reveals that (usually overlooked) contamination with hydrophobic polydimethylsiloxane (PDMS) may arise from the silicone components of the furnace. In this case, a homogeneous thin PDMS film over the entire surface results in water repellency (contact angle of 161° and roll-off angle of 15°). In contrast, annealing under the same conditions but in a contaminant-free furnace preserves the initial superhydrophilicity, whereas the annealing at 350 °C turns the hydrophobicity “off”. The theoretical calculations of optical properties demonstrate that the laser-induced oxide layer formed during the laser texturing significantly influences the surface optical behavior. Consequently, the interference of light reflected by the air–oxide and the oxide–metal interfaces should not be neglected and enables several advanced approaches to exploit such optical properties.

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Section: Influence Of the Low-temperature Annealing On The Wettabilitmentioning

confidence: 99%

Section: Influence Of the Low-temperature Annealing On The Wettabilitmentioning

confidence: 99%

Comment on “Bioinspired Reversible Switch between Underwater Superoleophobicity/Superaerophobicity and Oleophilicity/Aerophilicity and Improved Antireflective Property on the Nanosecond Laser-Ablated Superhydrophobic Titanium Surfaces”

Gregorčič

2020

ACS Appl. Mater. Interfaces

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“…Generally, the absorption of carbon item from the environment occurs in the long term [47,48], while the annealing process can accelerate the process in a short time [45,48,49]. There are several explanations for the increase of carbon concentration in the atmosphere including: the airborne hydrocarbon contamination from the atmosphere [45,46]; the absorption of other organic matters such as PDMS contamination from furnace [49], or other organic contamination like Table 2 with relative errors.…”

Section: Resultsmentioning

confidence: 99%

“…The amount of silver decreased significantly due to the increase of oxygen and carbon species on the sample surface. The increased carbon concentration and associated nonpolar carbon group formation decreased the surface free energy [ 42 , 43 , 44 , 45 , 46 ]. Generally, the absorption of carbon item from the environment occurs in the long term [ 47 , 48 ], while the annealing process can accelerate the process in a short time [ 45 , 48 , 49 ].…”

Section: Resultsmentioning

confidence: 99%

A Post-Treatment Method to Enhance the Property of Aerosol Jet Printed Electric Circuit on 3D Printed Substrate

et al. 2020

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Aerosol jet printing of electronic devices is increasingly attracting interest in recent years. However, low capability and high resistance are still limitations of the printed electronic devices. In this paper, we introduce a novel post-treatment method to achieve a high-performance electric circuit. The electric circuit was printed with aerosol jet printing method on an ULTEM substrate. The ULTEM substrate was fabricated by the Fused Deposition Modelling method. After post-treatment, the electrical resistance of the printed electric circuit was changed from 236 mΩ to 47 mΩ and the electric property was enhanced. It was found that the reduction of electric resistance was caused by surface property changes. Different surface analysis methods including scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS) were used to understand the effectiveness of the proposed method. The results showed that the microsurface structure remained the same original structure before and after treatment. It was found that the surface carbon concentration was significantly increased after treatment. Detailed analysis showed that the C-C bond increased obviously after treatment. The change of electrical resistance was found to be limited to the material’s surface. After polishing, the circuit resistance was changed back to its original value. As the electric circuit is the basic element of electric devices, the proposed method enables the fabrication of high performance devices such as capacitors, strain gauge, and other sensors, which has potential applications in many areas such as industrial, aerospace, and military usage.

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“…For the case of the PL sample, it is believed a certain portion of the carbon comes from the Ti-C 2 H 5 OH reaction in the laser processing. The other portion is due to the accumulation of carbon [ 31 ] possibly sourced from the airborne hydrocarbon contaminations [ 32 ] during the storage. The laser creates nanostructures with higher surface energy can increase the surface adsorption activities [ 32 ] and may help to capture the airborne hydrocarbon.…”

Section: Resultsmentioning

confidence: 99%

Femtosecond Laser Produced Hydrophobic Hierarchical Structures on Additive Manufacturing Parts

et al. 2018

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With the recent expansion of additive manufacturing (AM) in industries, there is an intense need to improve the surface quality of AM parts. A functional surface with extreme wettability would explore the application of AM in medical implants and microfluid. In this research, we propose to superimpose the femtosecond (fs) laser induced period surface structures (LIPSS) in the nanoscale onto AM part surfaces with the micro structures that are fabricated in the AM process. A hierarchical structure that has a similar morphology to a lotus leaf surface is obtained by combining the advantages of liquid assisting fs laser processing and AM. A water contact angle (WCA) of 150° is suggested so that a super hydrophobic surface is achieved. The scanning electron microscopy (SEM) images and X-ray photoelectron spectroscopy (XPS) analysis indicate that both hierarchical structures and higher carbon content in the laser processed area are responsible for the super hydrophobicity.

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Comment on “Nanosecond laser textured superhydrophobic metallic surfaces and their chemical sensing applications” by Duong V. Ta, Andrew Dunn, Thomas J. Wasley, Robert W. Kay, Jonathan Stringer, Patrick J. Smith, Colm Connaughton, Jonathan D. Shephard (Appl. Surf. Sci. 357 (2015) 248–254)

Cited by 88 publications

References 8 publications

Comment on “Bioinspired Reversible Switch between Underwater Superoleophobicity/Superaerophobicity and Oleophilicity/Aerophilicity and Improved Antireflective Property on the Nanosecond Laser-Ablated Superhydrophobic Titanium Surfaces”

Comment on “Bioinspired Reversible Switch between Underwater Superoleophobicity/Superaerophobicity and Oleophilicity/Aerophilicity and Improved Antireflective Property on the Nanosecond Laser-Ablated Superhydrophobic Titanium Surfaces”

A Post-Treatment Method to Enhance the Property of Aerosol Jet Printed Electric Circuit on 3D Printed Substrate

Femtosecond Laser Produced Hydrophobic Hierarchical Structures on Additive Manufacturing Parts

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