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使用皮秒激光制备了铝基超疏水表面,研究了激光脉冲数对试样表面形貌及浸润性的影响。随着脉冲数增加,试样表面微观结构由规则的纳米条纹结构逐渐转变为微纳复合结构,表面粗糙度呈现先增大后减小的趋势。当脉冲数为177时,粗糙度R_a达到最大值(3.855μm)。激光加工后,试样表面先是超亲水状态,经过100℃保温24 h处理后转变为疏水甚至超疏水状态。试样表面浸润性的转变是其微观形貌和化学成分共同作用的结果。
The superhydrophobic surface of aluminum was prepared by picosecond laser and the effect of laser pulse number on the surface morphology and wettability of the sample was studied. As the pulse number increases, the microstructure of the sample gradually changes from the regular nanostrip structure to the micro-nano composite structure, and the surface roughness first increases and then decreases. When the pulse number is 177, the roughness R_a reaches the maximum (3.855μm). After the laser processing, the surface of the sample is superhydrophilic at first, after being treated at 100 ° C for 24 h, it turns to be hydrophobic or even superhydrophobic. The change of wettability of the sample surface is the result of the combined effect of its micro-morphology and chemical composition.