Direct laser patterning for transparent superhydrophobic glass surfaces without any chemical coatings
- PDF / 3,301,140 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 92 Downloads / 212 Views
Direct laser patterning for transparent superhydrophobic glass surfaces without any chemical coatings The‑Hung Dinh1 · Chi‑Vinh Ngo1,2 · Doo‑Man Chun1 Received: 22 February 2020 / Accepted: 18 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This study describes a simple method to fabricate a transparent superhydrophobic soda-lime glass surface. The method uses only laser-beam machining and heat treatment, without the application of a chemical coating. The resulting surface exhibited superhydrophobicity at a contact angle (CA) greater than 170° and a sliding angle (SA) less than 10°. In addition, relatively acceptable transmittance (> 50%) in visible light was observed. The superhydrophobic surface and superior transmittance were shown at relatively high laser powers (0.4 and 0.5 W), with a relatively large step size (300 and 350 µm). At a laser power of 0.2 W, the superhydrophobicity of the surface decreased. When the step size was increased from 150 to 350 µm with a reduced laser power (0.2 and 0.3 W), the CA decreased slightly and the SA increased from 5° to 60°. CA and SA can, therefore, be controlled with process parameters. Keywords Transparent superhydrophobic soda-lime glass · Nanosecond laser-beam machining · Heat treatment · Selfcleaning · Water positioning
1 Introduction Superhydrophobic surfaces can be defined as surfaces with a contact angle (CA) greater than 150° and a sliding angle (SA) smaller than 10°. Such surfaces have attracted considerable attention in academic and industrial fields due to their potential applications, including self-cleaning [1], anti-icing [2], anti-fogging [3], and anti-bacterial action [4]. A variety of methods of fabricating superhydrophobic surfaces are now available, including laser machining [5, 6], layer-by-layer assembly [3], and chemical etching [7]. Among them, laser machining has been used widely because of its precision and effectiveness for patterning on various material substrates. Besides, many types of materials can Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-03653-9) contains supplementary material, which is available to authorized users. * Doo‑Man Chun [email protected] 1
School of Mechanical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, China
2
be used in fabricating superhydrophobic surfaces such as metals (copper, aluminum, titanium) [8–10], ceramics (glass and sapphire) [11, 12], polymers [13, 14], and silicon [15]. Among these materials, glass is a unique material with high transmittance with a variety of applications such as windows (vehicles, buildings, etc.), display panels for electronic (mobile monitors, etc.), medical devices (biochips), and other equipment. Any glass with nanoscale or microscale roughness on its surface can become superhydrophobic, and considerable research efforts have been devoted to improving fabricatio
Data Loading...
