耐磨铝基超疏水材料的制备及其动态冷凝行为

2021-04-26 15:40:50 作者：王芳来源：材料研究学报分享至：

摘要

用水热法制备了铝基超疏水材料。SEM观测结果表明，这种材料表面有明显的微纳米复合结构；用动态摩擦试验机进行了循环摩擦实验，结果表明：这种材料的耐磨性能优异，2000次循环摩擦后样品表面变得略微平整，微米结构丢失，但是保留有大量ZnO纳米棒，仍保持超疏水特性。这种材料还具有良好的耐酸碱腐蚀能力。冷凝实验结果表明：冷凝液滴在微纳米复合结构中随机生成，有益的是凹槽中的冷凝液滴在长大和合并过程中逐渐脱离凹槽底部最终悬浮在粗糙结构的表面。这证实，冷凝液滴在样品表面保持Cassie态，为冷凝过程中频繁发生液滴合并自弹跳提供了条件。

关键词：材料表面与界面 ; 超疏水材料 ; 水热法 ; 耐磨性 ; 冷凝 ; 液滴合并自弹跳

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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