| DONG Yan-zhuo,JIANG Bing-yan,QIANG Jun.Effects of Mass Fraction of Cobalt in Mold Inserts on the Hydrophobicity of Mimic Lotus Leaf PDMS Parts[J],48(4):182-188 |
| Effects of Mass Fraction of Cobalt in Mold Inserts on the Hydrophobicity of Mimic Lotus Leaf PDMS Parts |
| Received:September 19, 2018 Revised:April 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.026 |
| KeyWord:Ni-Co alloy electroforming mold inserts hardness of mold inserts mimic lotus leaf surface quality hydro-phobicity |
| Author | Institution |
| DONG Yan-zhuo |
School of Mechanical and Electrical Engineering, Central South University, Changsha , China |
| JIANG Bing-yan |
School of Mechanical and Electrical Engineering, Central South University, Changsha , China |
| QIANG Jun |
School of Mechanical and Electrical Engineering, Central South University, Changsha , China |
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| Abstract: |
| The work aims to study the influence of mass fraction of cobalt in mold inserts on the surface quality and hydro-phobicity of the mimic lotus leaf PDMS parts and ascertain the feasibility of achieving the super-hydrophobicity of mimic lotus leaf PDMS parts with mold inserts electroformed with Ni-Co alloy on the basis of improving the hardness of mold inserts with electroformed Ni-Co alloy. Firstly, the electroforming and PDMS secondary template method was used to fabricate lotus leaf mold, mold inserts electroformed with Ni-Co alloy and PDMS parts with mimic lotus leaf hydrophobic surfaces. Then, the effect of cobalt content on the hardness of mold inserts and the microstructure, roughness and hydrophobicity of PDMS parts was analyzed by digital microhardness tester, super depth of field 3D microscope, Image-Pro Plus, laser confocal microscope, etc. Finally, hydrophobicity was further measured and analyzed by contact angle measuring instrument. The hardness of mold inserts increased from 244.1HV to above 450HV when mass fraction of cobalt reached above 22.4%. With the increase of mass fraction of cobalt from 0 to 51.5%, the microstructure aspect ratio of the mimic lotus leaf PDMS parts tended to decrease from 2.12 to 1.72 and then increase to 2.38. The surface microstructure area ratio decreased from 19.15% to 15.03%. The surface roughness Ra increased from 59.01 μm to 74.93 μm. The static contact angle decreased from 166.22° to 149° linearly, Which means the hydrophobicity was reduced. Compared with the microstructure aspect ratio and the area ratio, the surface roughness plays a major role in hydrophobicity of PDMS parts. While the hardness of mold inserts is improved significantly, the static contact angle of PDMS parts decreases from 166.22° to about 149° with the increase of mass fraction of cobalt, but PDMS parts still has good hydrophobicity. |
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