Superhydrophobic surfaces fabricated by microstructuring of stainless steel using a femtosecond laser

Wu, Bo; Zhou, Ming; Li, Jian; Xia, Ye; Li, Gang; Liu, Cai

doi:10.1016/j.apsusc.2009.07.061

Cited by 356 publications

(210 citation statements)

References 34 publications

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“…The height of the conical structure, and the spacing between two cones increased with increasing fluence. A similar observation was made on SS316L [114]. Kurselis et al (2012) studied the effect of fluence on the modulation period of microcolumn structures on carbon steel [79].…”

Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucmentioning

confidence: 82%

“…The effect of increasing fluence was reported on SS316L [114]. The width of undulating grooves increased with increasing fluence, thus the periodicity.…”

Section: Undulating Grooves/micro-ripplesmentioning

confidence: 94%

“…The fluence to form the columnar structure is higher than that of the upper threshold of the LIPSS formation. During dynamic interaction at low velocity, as the center of the Gaussian beam moves away after forming the columnar structure, the tail of the Gaussian beam creates LIPSS, because its fluence is low enough to match the threshold for LIPSS formation [12,111,114]. Accordingly, at the end of a scan, no LIPSS form, as shown in Figure 7b.…”

Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucmentioning

confidence: 99%

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Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining

2014

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Abstract:Femtosecond laser micromachining has emerged in recent years as a new technique for micro/nano structure fabrication because of its applicability to virtually all kinds of materials in an easy one-step process that is scalable. In the past, much research on femtosecond laser micromachining was carried out to understand the complex ablation mechanism, whereas recent works are mostly concerned with the fabrication of surface structures because of their numerous possible applications. The state-of-the-art knowledge on the fabrication of these structures on metals with direct femtosecond laser micromachining is reviewed in this article. The effect of various parameters, such as fluence, number of pulses, laser beam polarization, wavelength, incident angle, scan velocity, number of scans, and environment, on the formation of different structures is discussed in detail wherever possible. Furthermore, a guideline for surface structures optimization is provided. The authors' experimental work on laser-inscribed regular pattern fabrication is presented to give a complete picture of micromachining processes. Finally, possible applications of laser-machined surface structures in different fields are briefly reviewed.

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Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucmentioning

confidence: 82%

“…The effect of increasing fluence was reported on SS316L [114]. The width of undulating grooves increased with increasing fluence, thus the periodicity.…”

Section: Undulating Grooves/micro-ripplesmentioning

confidence: 94%

Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucmentioning

confidence: 99%

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Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining

2014

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“…Recently, laser-induced periodic surface structures (LIPSS) have gained remarkable interest because they enable tuning of a wide range of properties, including wettability [14], colorization [15], and tribological properties [16][17][18]. LIPSS or so-called ripples have been observed on numerous solid material surfaces.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Friction of Metals Using Laser-Induced Periodic Surface Nanostructures

2015

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Abstract:We report on the effect of femtosecond-laser-induced periodic surface structures (LIPSS) on the tribological properties of stainless steel. Uniform periodic nanostructures were produced on AISI 304L (American Iron and Steel Institute steel grade) steel surfaces using an 800-nm femtosecond laser. The spatial periods of LIPSS measured by field emission scanning electron microscopy ranged from 530 to 570 nm. The tribological properties of smooth and textured surfaces with periodic nanostructures were investigated using reciprocating ball-on-flat tests against AISI 440C balls under both dry and starved oil lubricated conditions. The friction coefficient of LIPSS covered surfaces has shown a lower value than that of the smooth surface. The induced periodic nanostructures demonstrated marked potential for reducing the friction coefficient compared with the smooth surface.

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“…. In recent times, θY as high as 154.6° have been reported, in the process of incorporating nanostructures on micropillars 17,41,42 .…”

Section: Robustness With An Energetically Favorable Cassie State (Casmentioning

confidence: 99%

Design of a robust superhydrophobic surface: thermodynamic and kinetic analysis

Sarkar

Kietzig

2015

Soft Matter

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The design of a robust superhydrophobic surface is a widely pursued topic. While many investigations are limited to applications with high impact velocities (for raindrops of the order of a few m/s), the essence of robustness is yet to be analyzed for applications involving quasi-static liquid transfer. To achieve robustness with high impact velocities, the surface parameters (geometrical details, chemistry) have to be selected from a narrow range of permissible values, which often entail additional manufacturing costs. From the dual perspectives of thermodynamics and mechanics, we analyze the significance of robustness for quasi-static drop impact, and present the range of permissible surface characteristics. For surfaces with a Young's contact angle greater than 90° and square micropillar geometry, we show that robustness can be enforced when an intermediate wetting state (sagged state) impedes transition to a wetted state (Wenzel state). From the standpoint of mechanics, we use available scientific data to prove that a surface with any topology must withstand a pressure of 117 Pa to be robust. Finally, permissible values of surface characteristics are determined, which ensure robustness with thermodynamics (formation of sagged state) and mechanics (withstanding 117 Pa).

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Superhydrophobic surfaces fabricated by microstructuring of stainless steel using a femtosecond laser

Cited by 356 publications

References 34 publications

Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining

Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining

Reduction of Friction of Metals Using Laser-Induced Periodic Surface Nanostructures

Design of a robust superhydrophobic surface: thermodynamic and kinetic analysis

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