| YU Jian-wu,LU Yue-tuo,LUO Hong,TONG Rui-qing,SONG Jin-gen.Effects of Dimension and Shape of Micro-milled Microstructure on PMMA Surface Hydrophobicity[J],50(1):287-295 |
| Effects of Dimension and Shape of Micro-milled Microstructure on PMMA Surface Hydrophobicity |
| Received:January 06, 2020 Revised:November 30, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.01.024 |
| KeyWord:microstructure surface hydrophobicity contact angle pinning effect micro-milling |
| Author | Institution |
| YU Jian-wu |
School of Mechanical and Vehicle Engineering, Hunan University, Changsha , China;State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Changsha , China |
| LU Yue-tuo |
School of Mechanical and Vehicle Engineering, Hunan University, Changsha , China |
| LUO Hong |
School of Mechanical and Vehicle Engineering, Hunan University, Changsha , China;State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Changsha , China |
| TONG Rui-qing |
School of Mechanical and Vehicle Engineering, Hunan University, Changsha , China |
| SONG Jin-gen |
School of Mechanical and Vehicle Engineering, Hunan University, Changsha , China |
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| Abstract: |
| The work aims to investigate the effects of different dimensions and array shapes of microstructure on PMMA surface hydrophobicity. Microgroove, square-pillar, circular and elliptical arrays were prepared on PMMA surface through precision micro-milling. The measured contact angle and shape of water droplet were used to indicate the surface hydrophobicity. When the microgroove width B, the boss width C, and the microgroove depth H of the microgroove arrays changed from 84.86 to 208.77 μm, 36.22 to 133.94 μm and 63.76 to 136.60 μm, the vertical contact angle θ⊥ changed from 129.4° to 143.5°, 138.3° to 124.0° and 125.8° to 141.8°, and the parallel contact angle θ∥ varied from 62.3° to 69.6°, 75.0° to 66.3°, and 81.5° to 72.0°, respectively. When the B, C, and H of the micro square-pillar arrays changed from 70.76 to 138.99 μm, 47.52 to 128.04 μm and 70.84 to 175.94 μm, the contact angle θ changed from 130.3° to 102.1°, 114.9° to 129.5°, and 105.7° to 119.7°, respectively. Water droplets showed elliptical droplet shape on the surfaces of microgroove and elliptical arrays, while the spherical shape on the micro square-pillar and circular arrays. The dimensions and array shapes of microstructures have different effects on the surface hydrophobicity of PMMA and the θ⊥ is more sensitive to the change of dimensions than θ∥. Moreover, the shape of water droplet is obviously influenced by pinning effect. On elliptical and circular arrays and perpendicular direction of microgroove arrays, the shape of water droplets is dominated by pinning effect. However, on the micro square-pillar arrays and the parallel direction of microgroove arrays, the shape of the water droplet is controlled by the pinning effect and the discontinuity of the solid-liquid-gas three-phase contact line. Research results are expected to support the design of the bio-functional microstructure surfaces. |
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