黄文涛,邵志松,张国光,周韦.氧化处理对电沉积吸液芯性能的影响研究[J].表面技术,2023,52(5):306-312, 335.
HUANG Wen-tao,SHAO Zhi-song,ZHANG Guo-guang,ZHOU Wei.Effect of Oxidation Treatments on Performance of Electrodeposited Wick[J].Surface Technology,2023,52(5):306-312, 335 |
| 氧化处理对电沉积吸液芯性能的影响研究 |
| Effect of Oxidation Treatments on Performance of Electrodeposited Wick |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.05.030 |
| 中文关键词: 电沉积 吸液芯 超亲水 超疏水 氧化 |
| 英文关键词:electrodeposition wick super hydrophilic superhydrophobic oxidation |
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| 中文摘要: |
| 目的 通过研究自然氧化、过氧化氢氧化和130 ℃氧化处理对电沉积吸液芯润湿性和毛细性能的影响，探究吸液芯毛细性能在空气中衰减的原因。方法 通过电沉积在铜表面制备一层多孔铜吸液芯，分别对吸液芯进行自然氧化、过氧化氢浸泡和130 ℃烘烤处理，利用接触角测量和毛细上升法分析吸液芯表面的润湿性和毛细性能，通过扫描电镜(SEM)观察吸液芯微观形貌，采用X射线光电子能谱(XPS)和傅里叶红外光谱分析吸液芯表面成分。结果 3种氧化处理后，吸液芯的润湿性与毛细性能有明显差异。自然氧化处理和过氧化氢处理的吸液芯均表现为超亲水，接触角为0°，而130 ℃烘烤的吸液芯表现为超疏水，接触角高达150.49°。水在过氧化氢处理的吸液芯表面的运行速度比在自然氧化的表面更快。3种不同状态的吸液芯微观形貌都为树枝状结构，没有明显差异。XPS图显示，自然氧化处理的吸液芯表面部分氧化，存在76.4%(质量分数)Cu2O;130 ℃烘烤的试样表面全部氧化，为60.6%的Cu2O和39.4%的CuO;而过氧化氢浸泡的表面为100%的CuO2。结论 3种氧化处理不会改变吸液芯的微观结构，不同氧化处理的吸液芯呈现出不同的毛细性能和润湿性。130 ℃氧化处理1 h后，吸液芯完全丧失毛细性能，而过氧化氢氧化处理反而可以增强吸液芯的毛细性能，吸液芯表面形成氧化铜导致表面能大幅度降低是毛细性能在空气中衰减的主要原因。 |
| 英文摘要: |
| The work aims to study the effects of natural oxidation, hydrogen peroxide oxidation and oxidation treatment at 130 ℃ on wettability and capillary performance of electrodeposited wick to explore the causes of capillary performance failure of wick in air. In this experiment, a porous copper wick was prepared on the copper surface by electrodeposition. The wick was naturally oxidized, soaked in hydrogen peroxide and baked at 130 ℃ respectively. The wettability and capillary performance of the wick surface were analyzed by capillary rising and contact angle measuring. The morphology of the wick was observed by scanning electron microscope (SEM), and the surface composition of the wick was analyzed by X-ray photoelectron spectroscopy (XPS) and Fourier infrared spectroscopy. The results showed that the color of the surface in different oxidation states was obviously different. The surface of the samples treated by natural oxidation was red, the samples treated by hydrogen peroxide was brownish yellow, and the sample oxidized at 130 ℃ was obviously black. The surface of the samples oxidized by water and hydrogen peroxide completely spread and quickly spread around, while the surface of the samples oxidized at 130 ℃ was obviously spherical and could not be wetted on the surface of the samples. There were obvious differences in capillary properties between the wicks soaked in hydrogen peroxide and those baked at 130 ℃. The wicks treated by natural oxidation and hydrogen peroxide were both super-hydrophilic, with a contact angle of 0, but the water run faster on the latter, and the wicks baked at 130 ℃ were super-hydrophobic, with a contact angle of 150.49; There was no difference in the micro-morphology of the wick in three different states, and there were many scattered tree-like structures. Each tree-like structure was composed of a large number of dendrites, and there were obvious gaps of about 10 μm between the tree-like structures, while there were a large number of smaller gaps among the dendrites, thus forming rich capillary structures with different sizes. The difference of wetting speed between the samples in three different states and water had nothing to do with the microstructure of the copper layer surface. There were obvious differences in wettability and capillary properties between the three kinds of absorbent cores treated by oxidation:the absorbent cores treated by natural oxidation and hydrogen peroxide were super hydrophilic with a contact angle of 0, while the absorbent cores baked at 130 ℃ were super hydrophobic with a contact angle of 150.49; The running speed of the wick surface treated with hydrogen peroxide was faster than that on the naturally oxidized surface. The micro-morphology of the wicks in three different states was dendritic structure, and there was no obvious difference. XPS showed that the surface of the wicks treated by natural oxidation was partially oxidized, and 76.4% Cu2O exists. The surface of the samples baked at 130 ℃ was completely oxidized, reaching 60.6% Cu2O and 39.4% CuO, while that of samples soaked in hydrogen peroxide was 100% CuO2. Three oxidation treatments will not change the microstructure of the wick. Different oxidation treatments will show different capillary properties and wettability. After oxidation treatment at 130 ℃ for 1 h, the wick completely loses its capillary property, while the oxidation treatment with hydrogen peroxide can enhance the capillary property. The main reason for the capillary property attenuation in the air is that the surface energy of the wick is greatly reduced due to the formation of copper oxide on its surface. |
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