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Fabrication of biomimetic anisotropic crescent-shaped microstructured surfaces by laser shock imprinting Cover

Fabrication of biomimetic anisotropic crescent-shaped microstructured surfaces by laser shock imprinting

Materials Science-Poland
Volume 41 (2023): Issue 3 (September 2023)
By: Jie Ji,  Kangnan Meng,  Pin Li and  Zongbao Shen  
Open Access
|Feb 2024

Figures & Tables

Fig. 1.

Bionic crescent-shaped microstructure mold: (a) parameters of microstructure characteristics on the mold surface; (b) parameters of the crescent-shaped microstructure array on the mold surface; (c) physical mold; and (d) the physical surface structure of the mold

Fig. 2.

Principle diagram of LSI

Fig. 3.

LSI experimental system

Fig. 4.

Two-dimensional morphologies of the microstructures for two different offset distances (P): (a) P = 0 μm; (b) P = 45 μm; (c) P = 0 μm, measurement results of a single spot imprint diameter; (d) P = 45 μm, measurement results of a single spot imprint diameter

Fig. 5.

Surface crescent-shaped microstructure of the workpiece: (a) SEM morphology of a single crescent-shaped microstructure; (b) magnification of the crescent-shaped outer arc forming region; (c) the size measurement of a single crescent-shaped microstructure; (d) magnification of the crescent-shaped left corner forming region; (e) magnification of the crescent-shaped inner arc forming region; (f) magnification of the crescent-shaped right corner forming region

Fig. 6.

Three-dimensional morphologies of the workpiece surface for two different offset distances (P). (a) P = 0 μm; (b) P = 45 μm

Fig. 7.

Three-dimensional morphologies of the workpiece surface fabricated by different LSI parameters: (a) LSE 835 mJ, 3 shocks; (b) LSE 1020 mJ, impact 3 shocks; (c) LSE 1200 mJ, 3 shocks; (d) LSE 1020 mJ, 1 shock; (e) LSE 1020 mJ, 2 shocks; (f) LSE 1020 mJ, 3 shocks

Fig. 8.

Influence of LSI processing parameters on the forming height of crescent-shaped microstructures on the workpiece surface

Fig. 9.

Schematic diagram of dynamic changes of the workpiece and soft film imprinted by multiple LSIs. (a) the first LSI; (b) the second LSI

Fig. 10.

Heights of crescent-shaped microstructures at different positions: (a) center of symmetry; (b) near the right rounded corner; (c) localized inner cross section; (d) contour line at position (a); (e) contour line at position (b); (f) contour line at position (c)

Fig. 11.

Schematic diagram of the effect of different width molds on forming depth: (a) wide mold; (b) narrow mold

Fig. 12.

Two different constraint cases: (a) two directions; (b) three directions

Fig. 13.

Comparison of ablated layers processed with diverse LSI parameters: (a) LSE 835 mJ, 3 shocks; (b) LSE 1020 mJ, 3 shocks; (c) LSE 1200 mJ, 3 shocks

Fig. 14.

Contact angle diagram on the surface of the workpiece. Contact angle on the surface of raw material (left), contact angle on the surface of crescent-shaped microstructure (right)

Fig. 15.

Effect of different LSI processing parameters on the contact angle: (a) effect of the number of laser shocks on the contact angle; (b) effect of LSE on the contact angle

Fig. 16.

Contact angle diagram of water droplets on the workpiece surface in two directions: (a) parallel (//) direction; (b) perpendicular (⊥) direction

Fig. 17.

Influence of the offset distance (P) of the alignment of crescent-shaped microstructure features on the contact angle difference of water droplets on their surfaces

Fig. 18.

Residual droplet morphology on crescent-shaped, microstructured workpiece surface: (a) Droplet overall solid-liquid contact line; (b) solid-liquid contact line of droplet on the surface of workpiece on the bottom of the arc

Fig. 19.

Modeling of solid–liquid contact lines of crescent-shaped microstructures: (a) location of some solid–liquid contact lines of crescent-shaped microstructures; (b) mathematical modeling of solid–liquid contact lines of crescent-shaped microstructures

Fig. 20.

Schematic diagram of the wettability gradient surface of the crescent-shaped microstructure: (a) low wettability zone; (b) high wettability zone

Fig. 21.

Schematic diagram of the theory of directional spreading of liquid droplet

Fig. 22.

Schematic diagram of the method of fabricating type-I flow channel by LSI

Fig. 23.

Type-1 flow channel composed of crescent-shaped microstructure arrays: (a) schematic diagram of the principle of type-I flow channel; (b) a partially magnified image of the microstructured zone; (c) fabricated type-I flow channel morphology; (d) local morphology of type-I flow channel

Fig. 24.

Water droplet spreading mode on the surface of the type-I flow channel: (a) comparison of water droplet morphology in the flow channel and raw material areas; (b) morphology of water droplets on both sides of the microstructure area inside the flow channel area

Fig. 25.

Diagram of water droplet movement position within the flow channel: (a) flow channel without water droplets; (b) flow channel after water droplet injection; (c) schematic diagram of water droplet spreading position within the flow channel

Process parameters for LSI

LSE1 (mJ)Number of laser shocks (times)
835123
1020123
1200123

Materials for LSI

FunctionalityConstraint layerAblative layerSoft filmWorkpiece
MaterialPMMAAluminum foilPolyurethaneCopper foil
Thickness3 mm20 μm100 μm10 μm

Parameters of the fabricated molds

MoldPLR1R2R3X0Y0
type(μ m)(μ m)(μ m)(μ m)(μ m)(μ m)(μ m)
Mold 1045303649060
Mold 230
Mold 345
DOI: https://doi.org/10.2478/msp-2023-0039 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331
Journal RSS Feed
Language: English
Page range: 140 - 158
Submitted on: Oct 11, 2023
|
Accepted on: Jan 9, 2024
|
Published on: Feb 22, 2024
Published by: Wroclaw University of Science and Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
laser shock imprinting,
crescent-shaped microstructure,
anisotropic wettability,
directional spreading of droplet,
limitation of droplet spread
Related subjects:
Materials sciences,
Materials sciences, other,
Nanomaterials,
Functional and smart materials,
Materials characterization and properties

© 2024 Jie Ji, Kangnan Meng, Pin Li, Zongbao Shen, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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