金属基润湿性可控仿生超疏水表面的制备与调控机制
发布时间：2018-07-28 17:42
【摘要】：受自然界的启发,无论是亲水表面、疏水表面还是超疏水表面已经得到广泛而深入的研究。然而灵感来源于自然而不停留于自然,近些年,可实现不同润湿性之间转换的仿生智能功能表面由于其在微流体、生物探测、智能转换开关等方面潜在的应用而得到科学界更多的探索。而铝及其合金由于拥有较好的力学性能和切削加工性能,而在飞机制造、汽车及其零部件制造、建筑行业、轨道交通等领域有着广泛的应用。因此选择铝合金作为基体构建仿生智能功能表面,可以有效的提高铝合金在基础工业中的应用。本文选择3102铝合金作为基体,使用阳极氧化法在铝合金表面构建微纳米双重结构,并使用一步修饰法在阳极氧化铝合金表面制备p H响应超疏水表面,系统总结了不同阳极氧化参数下的表面结构特征,系统分析了不同浓度比例的修饰溶液对表面p H响应性的影响,揭示了实现p H响应的机理。在系统分析修饰溶液对表面p H响应性影响的基础上,对阳极氧化铝合金完全使用低表面能物质正十二烷基硫醇修饰,制备低粘附超疏水铝合金表面,系统分析表面的润湿性和耐腐蚀性,揭示超疏水表面对提高铝合金耐腐蚀性的机理。采取阳极氧化的方法在铝合金表面构建微纳米粗糙结构,对阳极氧化铝合金进行喷金处理,随后使用正十二烷基硫醇和十一疏基硫醇的混合乙醇溶液进行修饰,成功制备了具有p H响应的超疏水表面,该表面在液滴的p H值从7增加到12的过程中可以实现超疏水到超亲水之间的转换。电压20V,阳极氧化时间120min,电解液溶度为40ml乙醇溶液中含5ml 0.1mol/L的硝酸铝水溶液时,为使用阳极氧化法在铝合金表面构建微纳米结构双重结构最佳的工艺条件。正十二烷基硫醇和十一疏基硫醇的浓度之和为1m M/L,正十二烷基硫醇和十一疏基硫醇的比例为3:7时,为最佳的修饰溶液浓度。通过扫面电镜观察以及光电子能谱、红外光谱分析,p H响应超疏水表面是表面微观结构和表面化学成分协同作用实现。将喷金预处理的铝合金表面进行阳极氧化处理,然后用正十二烷基硫醇进行修饰,成功制备了具有低粘附、自清洁性的超疏水表面。表面接触角为162?,滚动角接近于~5?。通过耐腐蚀性测试,在质量分数为3.5%的氯化钠溶液中,超疏水试样拥有比未处理试样和仅经过阳极氧化的试样更好的耐腐蚀性。结合表面自清洁试验、镜面反射现象和耐腐蚀性测试,揭示了铝合金表面耐腐蚀性的提高与超疏水表面的微观结构和表面斥水性有关。
[Abstract]:Inspired by nature, hydrophilic surfaces, hydrophobic surfaces and superhydrophobic surfaces have been extensively and deeply studied. However, inspiration comes from nature rather than staying in nature. In recent years, bionic intelligent function surfaces can be converted between different wettability due to their presence in microfluids, biological detection, Intelligent switching switches and other potential applications have been more scientific exploration. Aluminum and its alloys have been widely used in aircraft manufacturing, automobile and parts manufacturing, construction industry, rail transit and other fields because of their good mechanical properties and cutting and processing properties. Therefore, choosing aluminum alloy as substrate to construct bionic intelligent functional surface can effectively improve the application of aluminum alloy in basic industry. In this paper, 3102 aluminum alloy was chosen as the substrate, and the micro-nano double structure was constructed on the surface of aluminum alloy by anodizing method. The p-H responsive superhydrophobic surface was prepared on the surface of anodized aluminum alloy by one-step modification method. The characteristics of surface structure under different anodic oxidation parameters were systematically summarized. The effects of different concentration of modified solution on the surface pH response were systematically analyzed and the mechanism of realizing pH response was revealed. Based on the systematic analysis of the effect of the modified solution on the surface pH responsiveness, the low adhesion superhydrophobic aluminum alloy surface was prepared by modifying the anodized aluminum alloy with n-dodecyl mercaptan, a low surface energy substance. The wettability and corrosion resistance of surface were analyzed systematically, and the mechanism of super hydrophobic surface on improving corrosion resistance of aluminum alloy was revealed. The surface of aluminum alloy was prepared by anodic oxidation. The surface of aluminum alloy was sprayed with gold, and then modified with mixed ethanol solution of n-dodecyl mercaptan and undecyl mercaptan. The superhydrophobic surface with p-H response was successfully prepared, and the superhydrophobic to super-hydrophilic transition was realized when the pH value of the droplet increased from 7 to 12. When the voltage is 20 V, the anodizing time is 120 min, the solubility of electrolyte is the solution of aluminum nitrate containing 5ml 0.1mol/L in 40ml ethanol solution, the optimum process condition is that the double structure of micro and nano structure is constructed on the surface of aluminum alloy by anodic oxidation method. The sum of the concentration of n-dodecyl mercaptan and undecylmercaptan is 1m m / L, and the ratio of n-dodecyl mercaptan to undecylmercaptan is 3:7, the optimum concentration of modified solution is obtained. By scanning electron microscopy (SEM) and photoelectron spectroscopy (XPS), IR spectra showed that the superhydrophobic surface was formed by the synergistic effect of surface microstructure and surface chemical composition. The surface of aluminum alloy pretreated by spraying gold was anodized and modified with n-dodecyl mercaptan. The super-hydrophobic surface with low adhesion and self-cleanness was successfully prepared. The contact angle of the surface is 162 掳and the rolling angle is close to 5%. The corrosion resistance of superhydrophobic samples in 3.5% NaCl solution was better than that of untreated and anodized samples. Combined with surface self-cleaning test, mirror reflection phenomenon and corrosion resistance test, it is revealed that the improvement of corrosion resistance of aluminum alloy surface is related to the microstructure of superhydrophobic surface and surface water repellency.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.4
本文编号：2151108
[Abstract]:Inspired by nature, hydrophilic surfaces, hydrophobic surfaces and superhydrophobic surfaces have been extensively and deeply studied. However, inspiration comes from nature rather than staying in nature. In recent years, bionic intelligent function surfaces can be converted between different wettability due to their presence in microfluids, biological detection, Intelligent switching switches and other potential applications have been more scientific exploration. Aluminum and its alloys have been widely used in aircraft manufacturing, automobile and parts manufacturing, construction industry, rail transit and other fields because of their good mechanical properties and cutting and processing properties. Therefore, choosing aluminum alloy as substrate to construct bionic intelligent functional surface can effectively improve the application of aluminum alloy in basic industry. In this paper, 3102 aluminum alloy was chosen as the substrate, and the micro-nano double structure was constructed on the surface of aluminum alloy by anodizing method. The p-H responsive superhydrophobic surface was prepared on the surface of anodized aluminum alloy by one-step modification method. The characteristics of surface structure under different anodic oxidation parameters were systematically summarized. The effects of different concentration of modified solution on the surface pH response were systematically analyzed and the mechanism of realizing pH response was revealed. Based on the systematic analysis of the effect of the modified solution on the surface pH responsiveness, the low adhesion superhydrophobic aluminum alloy surface was prepared by modifying the anodized aluminum alloy with n-dodecyl mercaptan, a low surface energy substance. The wettability and corrosion resistance of surface were analyzed systematically, and the mechanism of super hydrophobic surface on improving corrosion resistance of aluminum alloy was revealed. The surface of aluminum alloy was prepared by anodic oxidation. The surface of aluminum alloy was sprayed with gold, and then modified with mixed ethanol solution of n-dodecyl mercaptan and undecyl mercaptan. The superhydrophobic surface with p-H response was successfully prepared, and the superhydrophobic to super-hydrophilic transition was realized when the pH value of the droplet increased from 7 to 12. When the voltage is 20 V, the anodizing time is 120 min, the solubility of electrolyte is the solution of aluminum nitrate containing 5ml 0.1mol/L in 40ml ethanol solution, the optimum process condition is that the double structure of micro and nano structure is constructed on the surface of aluminum alloy by anodic oxidation method. The sum of the concentration of n-dodecyl mercaptan and undecylmercaptan is 1m m / L, and the ratio of n-dodecyl mercaptan to undecylmercaptan is 3:7, the optimum concentration of modified solution is obtained. By scanning electron microscopy (SEM) and photoelectron spectroscopy (XPS), IR spectra showed that the superhydrophobic surface was formed by the synergistic effect of surface microstructure and surface chemical composition. The surface of aluminum alloy pretreated by spraying gold was anodized and modified with n-dodecyl mercaptan. The super-hydrophobic surface with low adhesion and self-cleanness was successfully prepared. The contact angle of the surface is 162 掳and the rolling angle is close to 5%. The corrosion resistance of superhydrophobic samples in 3.5% NaCl solution was better than that of untreated and anodized samples. Combined with surface self-cleaning test, mirror reflection phenomenon and corrosion resistance test, it is revealed that the improvement of corrosion resistance of aluminum alloy surface is related to the microstructure of superhydrophobic surface and surface water repellency.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.4
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