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Long-term influence of laser-processing parameters on (super)hydrophobicity development and stability of stainless-steel surfaces
ID Gregorčič, Peter (Author), ID Conradi, Marjetka (Author), ID Hribar, Luka (Author), ID Hočevar, Matej (Author)

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Abstract
Controlling the surface wettability represents an important challenge in the field of surface functionalization. Here, the wettability of a stainless-steel surface is modified by 30-ns pulses of a Nd:YAG marking laser (λ = 1064 nm) with peak fluences within the range 3.3–25.1 J cm$^{−2}$. The short- (40 days), intermediate- (100 days) and long-term (1 year) superhydrophilic-to-(super)hydrophobic transition of the laser-textured surfaces exposed to the atmospheric air is examined by evaluating its wettability in the context of the following parameters: (i) pulse fluence; (ii) scan line separation; (iii) focal position and (iv) wetting period due to contact angle measurements. The results show that using solely a short-term evaluation can lead to wrong conclusions and that the faster development of the hydrophobicity immediately after laser texturing usually leads to lower final contact angle and vice versa, the slower this transition is, the more superhydrophobic the surface is expected to become (possibly even with self-cleaning ability). Depending on laser fluence, the laser-textured surfaces can develop stable or unstable hydrophobicity. Stable hydrophobicity is achieved, if the threshold fluence of 12 J cm$^{−2}$ is exceeded. We show that by nanosecond-laser texturing a lotus-leaf-like surface with a contact angle above 150° and roll-off angle below 5° can be achieved.

Language:English
Keywords:laser surface engineering, wetting, superhydrophobic surfaces, laser material processing, surface modification
Work type:Article (dk_c)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2018
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:15 str.
Numbering:Vol. 11, iss. 11, art. 2240
UDC:621.7(045)
ISSN on article:1996-1944
DOI:10.3390/ma11112240 This link opens in a new window
COBISS.SI-ID:16343835 This link opens in a new window
Publication date in RUL:14.11.2018
Views:724
Downloads:752
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Record is a part of a journal

Title:Materials
Shortened title:Materials
Publisher:MDPI
ISSN:1996-1944
COBISS.SI-ID:33588485 This link opens in a new window

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:11.11.2018

Secondary language

Language:Slovenian
Keywords:laserski inženiring površin, superhidrofobne površine, laserske obdelave

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
izpis_stevilka_projekta:P2-0392
Name:Optodinamika

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
izpis_stevilka_projekta:P2-0132
Name:Fizika in kemija površin kovinskih materialov

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
izpis_stevilka_projekta:Z2-9215
Name:Razvoj biomaterialov z laserskim teksturiranjem kovinskih zlitin (BiomatLasTex)

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