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, Peter (author)

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°). Contrarily, the annealing under the same conditions, but in a contaminant-free furnace preserves the initial superhydrophilicity, while 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

• Language: English
• Keywords: laser surface engineering, wettability, thin-film interference, polydimethylsiloxane
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: Str. 2117-2127
• Numbering: Vol. 13, iss. 2
• PID: 20.500.12556/RUL-124481
• UDC: 544.722.3(045)
• ISSN on article: 1944-8244
• DOI: 10.1021/acsami.9b23462
• COBISS.SI-ID: 17112859
• Publication date in RUL: 25.01.2021

Record is a part of a journal

• Title: ACS applied materials & interfaces
• Shortened title: ACS appl. mater. interfaces
• Publisher: American Chemical Society
• ISSN: 1944-8244
• COBISS.SI-ID: 14731286

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 25.01.2021

Secondary language

• Language: Slovenian
• Keywords: laserski inženering površin, omočljivost, interferenca tankih filmov, polidimetilsiloksan

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: J2-1741
• Name: Lasersko mikro in nanostrukturiranje za razvoj biomimetičnih kovinskih površin z edinstvenimi lastnostmi (LaMiNaS)

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0392
• Name: Optodinamika