| HUANG Wen-tao,SHAO Zhi-song,ZHANG Guo-guang,ZHOU Wei.Effect of Oxidation Treatments on Performance of Electrodeposited Wick[J],52(5):306-312, 335 |
| Effect of Oxidation Treatments on Performance of Electrodeposited Wick |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.05.030 |
| KeyWord:electrodeposition wick super hydrophilic superhydrophobic oxidation |
| Author | Institution |
| HUANG Wen-tao |
Nanchang Hangkong University, Nanchang , China |
| SHAO Zhi-song |
Nanchang Hangkong University, Nanchang , China |
| ZHANG Guo-guang |
Nanchang Hangkong University, Nanchang , China |
| ZHOU Wei |
Nanchang Hangkong University, Nanchang , China |
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| Abstract: |
| 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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