董彦灼,蒋炳炎,强军.模芯钴含量对仿荷叶PDMS制件表面疏水性的影响[J].表面技术,2019,48(4):182-188.
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].Surface Technology,2019,48(4):182-188 |
| 模芯钴含量对仿荷叶PDMS制件表面疏水性的影响 |
| Effects of Mass Fraction of Cobalt in Mold Inserts on the Hydrophobicity of Mimic Lotus Leaf PDMS Parts |
| 投稿时间：2018-09-19 修订日期：2019-04-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.026 |
| 中文关键词: 镍钴合金 电铸模芯 模芯硬度 仿荷叶 表面质量 疏水性 |
| 英文关键词:Ni-Co alloy electroforming mold inserts hardness of mold inserts mimic lotus leaf surface quality hydro-phobicity |
| 基金项目:国家自然科学基金重大研究计划培育项目（91123012）；中南大学研究生自主探索创新项目（2018zzts149） |
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| 中文摘要: |
| 目的 在采用电铸镍钴合金提高模芯硬度的基础上，研究模芯钴含量对仿荷叶PDMS制件表面质量与疏水性的影响，探明镍钴合金模芯用于模板法制备仿荷叶超疏水表面的可行性。方法 采用电铸-聚二甲基硅氧烷（PDMS）二次复制模板法先后制备荷叶母模、镍钴合金电铸模芯与仿荷叶疏水表面PDMS制件。采用数字式显微硬度仪、超景深三维显微镜、Image-Pro Plus图像处理软件、激光共聚焦显微镜等分析模芯钴含量对模芯硬度与PDMS制件表面微结构、粗糙度及疏水性的影响。最后采用接触角测量仪进一步测量与分析PDMS制件表面的疏水性能。结果 当镍钴合金模芯钴含量（质量分数计）达到22.4%以上时，模芯硬度较纯镍模芯由244.1HV提升至450HV以上。当模芯钴含量从0增加到51.5%时，仿荷叶PDMS制件表面微结构深宽比先从2.12减小至1.72，再增加至2.38；微结构面积占比从19.15%减小至15.03%；表面粗糙度Ra值从59.01 μm增加至74.93 μm；静态接触角从166.22°线性减小至149°左右，疏水性降低。结论 相比微结构深宽比与面积占比，表面粗糙度对PDMS制件疏水性的影响占主导作用。镍钴合金模芯硬度显著提高的同时，随钴含量的增大，仿荷叶PDMS制件的静态接触角从166.22°减小至149°左右，但仍具有良好的疏水性。 |
| 英文摘要: |
| 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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