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在室温空气条件下,利用1064nm皮秒激光加工系统在聚四氟乙烯(PTFE)表面加工出平均缝宽为25μm、壁厚为25μm、深度为75μm的沟槽阵列和边长为30μm、缝宽为25μm、高度为43μm的柱状阵列。加工后的聚四氟乙烯表面静态接触角达到167°,为超疏水表面。将制备出的超疏水聚四氟乙烯完全浸入纯净水中,通过玻璃器皿观察,其超疏水表面在水下出现金属光泽。实验发现,超疏水聚四氟乙烯表面在水下可使以一定角度斜入射的可见光反射光强增加。利用浸润性模型分析该现象出现的原因是超疏水表面在水下发生了全反射。
Under the air condition at room temperature, a 1064nm picosecond laser processing system was used to fabricate a groove array with an average slot width of 25μm, a wall thickness of 25μm and a depth of 75μm on the surface of polytetrafluoroethylene (PTFE) A columnar array of 25 μm and a height of 43 μm. After processing, the static contact angle of Teflon surface reaches 167 °, which is superhydrophobic surface. The prepared superhydrophobic PTFE completely immersed in purified water, observed through glassware, the superhydrophobic surface of the metallic luster appear underwater. The experimental results show that the surface of superhydrophobic PTFE can increase the visible light reflection intensity obliquely incident at an angle under water. The reason why this phenomenon is analyzed by the infiltration model is that the superhydrophobic surface is totally reflected under water.