超疏水微/纳米二级结构涂层的制备及其结构与性能
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摘要
本论文以自然界中超疏水性现象为基础,从仿生学角度出发,研究了一系列基于不同种类材料的超疏水表面制备方法。
以γ-氨丙基三乙氧基硅烷(硅烷偶联剂KH550)为连接剂,利用硅氧烷水解形成硅羟基的自组装功能,将聚四氟乙烯(PTFE)烧结形成的纳米级纤维与硅氧烷团聚的微米级粒子结合,制备了具有仿荷叶表面形貌的超疏水涂层,其静态水接触角达152°,滚动角约为5°。通过扫描电镜观察涂层的表面微观形貌,发现该涂层具有微/纳米二级结构。通过接触角的测试,探讨了表面微观结构和涂层疏水性能之间的关系。用电化学交流阻抗谱(EIS)分析覆有涂层的试样在模拟腐蚀环境下的腐蚀行为,结果表明该试样的腐蚀电流比裸钢片降低了3-4个数量级,具有较好的防腐性能。
以可溶性酚醛树脂为前驱体、F127为模板剂,在不锈钢基体上制备了有序介孔碳膜,并以此为基底,分别以经过活化分散处理后的碳纳米管及所合成的葡萄糖碳球为填充相,构筑了超疏水表面所要求的微纳米复合结构,并通过表面化学修饰获得了超疏水涂层。通过场发射扫描电镜等了所制备的超疏水材料的表面结构以及表面化学成分,并考察了其在腐蚀环境下的腐蚀防护性能。其中以碳纳米管为填充相的复合涂层,表面具有竖直生长的碳纳米阵列结构,内部俘获大量空气,实际接触面积仅为6.82%,其接触角高达165°,具有极好的自清洁性,相比于非超疏水的普通涂层,具有更优异的防护性能。
Inspired by the super-hydrophobic phenomenon in the nature, a series of synthesis techniques, based on the bionics, were explored to prepare various materials featured by super-hydrophobic surface. In addition, detailed structure characterization and the relevant performance tests were also performed.
Super-hydrophobic coatings, characteristic of Lotus-resembled surface morphology, were prepared usingγ?aminopropyltriethoxylsilane (KH550) as a linker, the self-assembly of silanol group hydrolyzed from siloxane, the mixture of the nano-fibers derived from the sintered PTFE and the micro-particles achieved by the aggregation of siloxane. The static contact angle approached 152°, and the roll angle approximated to 5°. SEM showed its secondary structure for as-made coatings.
Contact angle tests were undertaken to investigate the relationship between surface microscopic strutcute and hydrophobic performance of the coatings. EIS was utilized to analyze the corrosion behavior of samples covered by coatings under simulated corrosion conditions. The results showed that the corrosion current of samples was decreased by 3-4 orders of magnitude than mere stainless steel, signifying an excellent corrosion protective performance. Ordered mesoporous carbon film was prepared on the stainless steel substrate using soluble phenolic resins as carbon precursor and F127 as template-directing agent. The following micro-nano composite structure was constructed using carbon film as substrate together with the as-synthesized glucose carbon spheres and activated dispersion-treated carbon nanotubes as filler via homogenous and non-homogenous methods. SEM technology was employed to characterize the surface strucute and chemical components of as-made superhydrophobic materials. And the corrosion protective performance was conducted under the corrosion conditons. The composite coating, using carbon nanotubes as filler, exhibited carbon nanotubes arrayed structure upright to the surface. Wherein the contact angle reached as high as 165°, suggesting much more excellent protective performance compared with non-superhydrophobic coatings.
以γ-氨丙基三乙氧基硅烷(硅烷偶联剂KH550)为连接剂,利用硅氧烷水解形成硅羟基的自组装功能,将聚四氟乙烯(PTFE)烧结形成的纳米级纤维与硅氧烷团聚的微米级粒子结合,制备了具有仿荷叶表面形貌的超疏水涂层,其静态水接触角达152°,滚动角约为5°。通过扫描电镜观察涂层的表面微观形貌,发现该涂层具有微/纳米二级结构。通过接触角的测试,探讨了表面微观结构和涂层疏水性能之间的关系。用电化学交流阻抗谱(EIS)分析覆有涂层的试样在模拟腐蚀环境下的腐蚀行为,结果表明该试样的腐蚀电流比裸钢片降低了3-4个数量级,具有较好的防腐性能。
以可溶性酚醛树脂为前驱体、F127为模板剂,在不锈钢基体上制备了有序介孔碳膜,并以此为基底,分别以经过活化分散处理后的碳纳米管及所合成的葡萄糖碳球为填充相,构筑了超疏水表面所要求的微纳米复合结构,并通过表面化学修饰获得了超疏水涂层。通过场发射扫描电镜等了所制备的超疏水材料的表面结构以及表面化学成分,并考察了其在腐蚀环境下的腐蚀防护性能。其中以碳纳米管为填充相的复合涂层,表面具有竖直生长的碳纳米阵列结构,内部俘获大量空气,实际接触面积仅为6.82%,其接触角高达165°,具有极好的自清洁性,相比于非超疏水的普通涂层,具有更优异的防护性能。
Inspired by the super-hydrophobic phenomenon in the nature, a series of synthesis techniques, based on the bionics, were explored to prepare various materials featured by super-hydrophobic surface. In addition, detailed structure characterization and the relevant performance tests were also performed.
Super-hydrophobic coatings, characteristic of Lotus-resembled surface morphology, were prepared usingγ?aminopropyltriethoxylsilane (KH550) as a linker, the self-assembly of silanol group hydrolyzed from siloxane, the mixture of the nano-fibers derived from the sintered PTFE and the micro-particles achieved by the aggregation of siloxane. The static contact angle approached 152°, and the roll angle approximated to 5°. SEM showed its secondary structure for as-made coatings.
Contact angle tests were undertaken to investigate the relationship between surface microscopic strutcute and hydrophobic performance of the coatings. EIS was utilized to analyze the corrosion behavior of samples covered by coatings under simulated corrosion conditions. The results showed that the corrosion current of samples was decreased by 3-4 orders of magnitude than mere stainless steel, signifying an excellent corrosion protective performance. Ordered mesoporous carbon film was prepared on the stainless steel substrate using soluble phenolic resins as carbon precursor and F127 as template-directing agent. The following micro-nano composite structure was constructed using carbon film as substrate together with the as-synthesized glucose carbon spheres and activated dispersion-treated carbon nanotubes as filler via homogenous and non-homogenous methods. SEM technology was employed to characterize the surface strucute and chemical components of as-made superhydrophobic materials. And the corrosion protective performance was conducted under the corrosion conditons. The composite coating, using carbon nanotubes as filler, exhibited carbon nanotubes arrayed structure upright to the surface. Wherein the contact angle reached as high as 165°, suggesting much more excellent protective performance compared with non-superhydrophobic coatings.
引文
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