Texturing of metallic surfaces for superhydrophobicity by water jet guided laser micro-machining

Yi Shi; Zilin Jiang; Jian Cao; Kornel F. Ehmann

doi:10.1016/j.apsusc.2019.144286

Texturing of metallic surfaces for superhydrophobicity by water jet guided laser micro-machining

Yi Shi^*, Zilin Jiang, Jian Cao, Kornel F. Ehmann

^*Corresponding author for this work

Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

This experimental work demonstrates a new cost-effective way of achieving superhydrophobicity on metallic surfaces by micro-texturing with a novel water jet guided laser process. Compared to conventional pure laser texturing by nanosecond, picosecond and femtosecond lasers, water jet guided laser processing yields textures with an almost zero heat affected zone while the debris on the textured surface is simultaneously cleaned by the jet during the process. The effects of grid spacing, laser power coupled into the jet and water jet diameter are examined and processing conditions for achieving superhydrophobicity are provided. Changes in the wetting of the surface over time under ambient conditions from hydrophilic to superhydrophobic, due to changes in surface chemistry, were explored. It has been shown that the surface contact angle dramatically increases within the first couple of days after texturing when exposed to air. After around 20 days, the contact angle stabilized at 150°, 130° and 129° on textured 304 stainless steel, titanium and 6061 aluminum surfaces, respectively.

Original language	English (US)
Article number	144286
Journal	Applied Surface Science
Volume	500
DOIs	https://doi.org/10.1016/j.apsusc.2019.144286
State	Published - Jan 15 2020

Funding

The authors would like to thank Professor Q Jane Wang's tribology lab for providing the contact angle measurement system. This work made use of the EPIC and Keck-II facility of Northwestern University's NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. This research was funded by the National Science Foundation (Award CMMI #1234491).

Keywords

Superhydrophobicity
Surface texturing
Water jet guided laser processing
Wetting

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces, Coatings and Films
Surfaces and Interfaces

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10.1016/j.apsusc.2019.144286

Cite this

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title = "Texturing of metallic surfaces for superhydrophobicity by water jet guided laser micro-machining",

abstract = "This experimental work demonstrates a new cost-effective way of achieving superhydrophobicity on metallic surfaces by micro-texturing with a novel water jet guided laser process. Compared to conventional pure laser texturing by nanosecond, picosecond and femtosecond lasers, water jet guided laser processing yields textures with an almost zero heat affected zone while the debris on the textured surface is simultaneously cleaned by the jet during the process. The effects of grid spacing, laser power coupled into the jet and water jet diameter are examined and processing conditions for achieving superhydrophobicity are provided. Changes in the wetting of the surface over time under ambient conditions from hydrophilic to superhydrophobic, due to changes in surface chemistry, were explored. It has been shown that the surface contact angle dramatically increases within the first couple of days after texturing when exposed to air. After around 20 days, the contact angle stabilized at 150°, 130° and 129° on textured 304 stainless steel, titanium and 6061 aluminum surfaces, respectively.",

keywords = "Superhydrophobicity, Surface texturing, Water jet guided laser processing, Wetting",

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AU - Shi, Yi

AU - Jiang, Zilin

AU - Cao, Jian

AU - Ehmann, Kornel F.

PY - 2020/1/15

Y1 - 2020/1/15

N2 - This experimental work demonstrates a new cost-effective way of achieving superhydrophobicity on metallic surfaces by micro-texturing with a novel water jet guided laser process. Compared to conventional pure laser texturing by nanosecond, picosecond and femtosecond lasers, water jet guided laser processing yields textures with an almost zero heat affected zone while the debris on the textured surface is simultaneously cleaned by the jet during the process. The effects of grid spacing, laser power coupled into the jet and water jet diameter are examined and processing conditions for achieving superhydrophobicity are provided. Changes in the wetting of the surface over time under ambient conditions from hydrophilic to superhydrophobic, due to changes in surface chemistry, were explored. It has been shown that the surface contact angle dramatically increases within the first couple of days after texturing when exposed to air. After around 20 days, the contact angle stabilized at 150°, 130° and 129° on textured 304 stainless steel, titanium and 6061 aluminum surfaces, respectively.

AB - This experimental work demonstrates a new cost-effective way of achieving superhydrophobicity on metallic surfaces by micro-texturing with a novel water jet guided laser process. Compared to conventional pure laser texturing by nanosecond, picosecond and femtosecond lasers, water jet guided laser processing yields textures with an almost zero heat affected zone while the debris on the textured surface is simultaneously cleaned by the jet during the process. The effects of grid spacing, laser power coupled into the jet and water jet diameter are examined and processing conditions for achieving superhydrophobicity are provided. Changes in the wetting of the surface over time under ambient conditions from hydrophilic to superhydrophobic, due to changes in surface chemistry, were explored. It has been shown that the surface contact angle dramatically increases within the first couple of days after texturing when exposed to air. After around 20 days, the contact angle stabilized at 150°, 130° and 129° on textured 304 stainless steel, titanium and 6061 aluminum surfaces, respectively.

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KW - Surface texturing

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KW - Wetting

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Texturing of metallic surfaces for superhydrophobicity by water jet guided laser micro-machining

Abstract

Funding

Keywords

ASJC Scopus subject areas

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