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耐磨鋁基超疏水材料的制備及其動態(tài)冷凝行為

2021-04-26 15:40:50 作者：王芳來源：材料研究學(xué)報分享至：

摘要

用水熱法制備了鋁基超疏水材料。SEM觀測結(jié)果表明，這種材料表面有明顯的微納米復(fù)合結(jié)構(gòu)；用動態(tài)摩擦試驗機(jī)進(jìn)行了循環(huán)摩擦實驗，結(jié)果表明：這種材料的耐磨性能優(yōu)異，2000次循環(huán)摩擦后樣品表面變得略微平整，微米結(jié)構(gòu)丟失，但是保留有大量ZnO納米棒，仍保持超疏水特性。這種材料還具有良好的耐酸堿腐蝕能力。冷凝實驗結(jié)果表明：冷凝液滴在微納米復(fù)合結(jié)構(gòu)中隨機(jī)生成，有益的是凹槽中的冷凝液滴在長大和合并過程中逐漸脫離凹槽底部最終懸浮在粗糙結(jié)構(gòu)的表面。這證實，冷凝液滴在樣品表面保持Cassie態(tài)，為冷凝過程中頻繁發(fā)生液滴合并自彈跳提供了條件。

關(guān)鍵詞：材料表面與界面 ; 超疏水材料 ; 水熱法 ; 耐磨性 ; 冷凝 ; 液滴合并自彈跳

Abstract

Al-based superhydrophobic material with excellent wear resistance were prepared by hydrothermal method. SEM results reveal that there exists a distinct micro-nano hierarchical structure on the surface of the prepared material. After 2,000 cycles of friction test the surface of the prepared material became slightly smooth, but where a large number of ZnO nanorods still remained, which maintains superhydrophobic properties yet. Also, the Al-based superhydrophobic material has good resistance to acid- and alkali-corrosion. Condensation experiments shown that condensate droplets will be randomly generated on the micro-nano hierarchical structure. It is worth noting that the condensate droplets in the groove will gradually get out of the bottom of the groove during the growth and coalescence processes, and finally suspended on the surface. It confirmed that the condensate droplets remain in the Cassie state, which provides a guarantee for the frequent occurrence of self-propelled of condensate droplets.

Keywords： surface and interface ; superhydrophobic materials ; hydrothermal method ; wear resistant ; condensation ; self-propelled of condensate droplets

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