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首页> 外文期刊>Journal of coatings technology and research >Preparation of metallic coatings with reversibly switchable wettability based on plasma spraying technology
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Preparation of metallic coatings with reversibly switchable wettability based on plasma spraying technology

机译：基于等离子喷涂技术制备可逆转换润湿性的金属涂层

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摘要

Plasma spray technology was used for the preparation of metallic coatings with reversibly switch-able wettability. By spraying Fe, Cr, and Ni mixture powders with different sizes, a micro/submicro-dual scale morphology was obtained. The resultant metallic coating had a superhydrophilic nature, but could be switched into superhydrophobic by spraying an acetone solution of dodecanoic acid while the sprayed surface remained within a temperature range of 100-200℃, although dodecanoic acid itself has a hydro-philic nature. The obtained superhydrophobic coating remained stable if the temperature was below 200℃. The surface wettability could further be switched between superhydrophilicity and superhydrophobicity within a time-scale of only seconds by heating above 220℃ and re-spraying the acetone solution of dodecanoic acid in the temperature range of 100-200℃. A chemisorbed molecular layer of dodecanoic acid was responsible for the decrease of the surface energy, and the Fourier transform infrared spectroscopy (FTIR) results suggested that heating the substrate can greatly facilitate the formation of the chemisorbed layer and preferential orientation of the dodecanoic acid molecute.
机译：等离子喷涂技术用于制备具有可逆切换的润湿性的金属涂层。通过喷涂不同尺寸的Fe，Cr和Ni混合粉末，可以获得微观/亚微米尺度的形貌。所得的金属涂层具有超亲水性，但是尽管十二酸本身具有亲水性，但通过喷涂十二烷酸的丙酮溶液可将其转变为超疏水性，而喷涂表面保持在100-200℃的温度范围内。如果温度低于200℃，则所获得的超疏水涂层保持稳定。通过在220℃以上加热并在100-200℃的温度范围内重新喷涂十二烷酸的丙酮溶液，可以仅在几秒钟的时间内在超亲水性和超疏水性之间切换表面润湿性。十二烷酸的化学吸附分子层负责降低表面能，傅里叶变换红外光谱（FTIR）结果表明，加热基材可以大大促进化学吸附层的形成和十二烷酸分子的优先取向。

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