A hybrid laser ablation and chemical etching process for manufacturing nature-inspired anisotropic superhydrophobic structures

Research output: Contribution to conferencePaper

Abstract

The surface with anisotropic superhydrophobicity has great potential applications for drag reduction, drug delivery and microfluidic devices. Observation from natural biological surfaces proved that directional microstructures are indispensable to realize anisotropic superhydrophobicity. However, current lithography-based manufacturing approaches have limited capabilities to scale-up for real world industrial applications. This paper proposes a hybrid laser ablation and chemical etching process for manufacturing ratchet-like microstructures on 316L stainless steel for the first time. It harvests the advantages of both processes. The laser ablation will form specified recast layer and covered by oxide layer on the specimen, and these two layers can be easily removed in the chemical etching process hence to obtain the periodic ratchet-like microstructures. According to the experimental results, the direction of microstructures is same as with the laser beam feed direction. The width and depth of microstructures also can be well-controlled by laser power and pitch. The specimens with pith of 25 μm have contact angle larger than 150°. And the droplet easily rolls off along the laser beam feed direction but is pinned tightly in the opposite direction.
LanguageEnglish
Pages90-93
Number of pages4
Publication statusPublished - 3 Jun 2019
EventEUSPEN's 19th International Conference & Exhibition - Bilbao, Spain
Duration: 3 Jun 20197 Jun 2019
Conference number: 19th

Conference

ConferenceEUSPEN's 19th International Conference & Exhibition
CountrySpain
CityBilbao
Period3/06/197/06/19

Fingerprint

Laser ablation
Etching
Microstructure
Laser beams
Drag reduction
Drug delivery
Microfluidics
Lithography
Industrial applications
Contact angle
Stainless steel
Oxides
Lasers

Keywords

  • laser ablation
  • chemical etching
  • superhydrophobic surface

Cite this

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title = "A hybrid laser ablation and chemical etching process for manufacturing nature-inspired anisotropic superhydrophobic structures",
abstract = "The surface with anisotropic superhydrophobicity has great potential applications for drag reduction, drug delivery and microfluidic devices. Observation from natural biological surfaces proved that directional microstructures are indispensable to realize anisotropic superhydrophobicity. However, current lithography-based manufacturing approaches have limited capabilities to scale-up for real world industrial applications. This paper proposes a hybrid laser ablation and chemical etching process for manufacturing ratchet-like microstructures on 316L stainless steel for the first time. It harvests the advantages of both processes. The laser ablation will form specified recast layer and covered by oxide layer on the specimen, and these two layers can be easily removed in the chemical etching process hence to obtain the periodic ratchet-like microstructures. According to the experimental results, the direction of microstructures is same as with the laser beam feed direction. The width and depth of microstructures also can be well-controlled by laser power and pitch. The specimens with pith of 25 μm have contact angle larger than 150°. And the droplet easily rolls off along the laser beam feed direction but is pinned tightly in the opposite direction.",
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author = "Yukui Cai and Xichun Luo and Zongwei Xu and Lau, {King Hang Aaron} and Fei Ding and Yi Qin",
year = "2019",
month = "6",
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language = "English",
pages = "90--93",
note = "EUSPEN's 19th International Conference & Exhibition ; Conference date: 03-06-2019 Through 07-06-2019",

}

Cai, Y, Luo, X, Xu, Z, Lau, KHA, Ding, F & Qin, Y 2019, 'A hybrid laser ablation and chemical etching process for manufacturing nature-inspired anisotropic superhydrophobic structures' Paper presented at EUSPEN's 19th International Conference & Exhibition, Bilbao, Spain, 3/06/19 - 7/06/19, pp. 90-93.

A hybrid laser ablation and chemical etching process for manufacturing nature-inspired anisotropic superhydrophobic structures. / Cai, Yukui; Luo, Xichun; Xu, Zongwei; Lau, King Hang Aaron; Ding, Fei; Qin, Yi.

2019. 90-93 Paper presented at EUSPEN's 19th International Conference & Exhibition, Bilbao, Spain.

Research output: Contribution to conferencePaper

TY - CONF

T1 - A hybrid laser ablation and chemical etching process for manufacturing nature-inspired anisotropic superhydrophobic structures

AU - Cai, Yukui

AU - Luo, Xichun

AU - Xu, Zongwei

AU - Lau, King Hang Aaron

AU - Ding, Fei

AU - Qin, Yi

PY - 2019/6/3

Y1 - 2019/6/3

N2 - The surface with anisotropic superhydrophobicity has great potential applications for drag reduction, drug delivery and microfluidic devices. Observation from natural biological surfaces proved that directional microstructures are indispensable to realize anisotropic superhydrophobicity. However, current lithography-based manufacturing approaches have limited capabilities to scale-up for real world industrial applications. This paper proposes a hybrid laser ablation and chemical etching process for manufacturing ratchet-like microstructures on 316L stainless steel for the first time. It harvests the advantages of both processes. The laser ablation will form specified recast layer and covered by oxide layer on the specimen, and these two layers can be easily removed in the chemical etching process hence to obtain the periodic ratchet-like microstructures. According to the experimental results, the direction of microstructures is same as with the laser beam feed direction. The width and depth of microstructures also can be well-controlled by laser power and pitch. The specimens with pith of 25 μm have contact angle larger than 150°. And the droplet easily rolls off along the laser beam feed direction but is pinned tightly in the opposite direction.

AB - The surface with anisotropic superhydrophobicity has great potential applications for drag reduction, drug delivery and microfluidic devices. Observation from natural biological surfaces proved that directional microstructures are indispensable to realize anisotropic superhydrophobicity. However, current lithography-based manufacturing approaches have limited capabilities to scale-up for real world industrial applications. This paper proposes a hybrid laser ablation and chemical etching process for manufacturing ratchet-like microstructures on 316L stainless steel for the first time. It harvests the advantages of both processes. The laser ablation will form specified recast layer and covered by oxide layer on the specimen, and these two layers can be easily removed in the chemical etching process hence to obtain the periodic ratchet-like microstructures. According to the experimental results, the direction of microstructures is same as with the laser beam feed direction. The width and depth of microstructures also can be well-controlled by laser power and pitch. The specimens with pith of 25 μm have contact angle larger than 150°. And the droplet easily rolls off along the laser beam feed direction but is pinned tightly in the opposite direction.

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KW - chemical etching

KW - superhydrophobic surface

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