锡青铜超疏水表面纳秒激光制备及润湿性转变机理研究
Preparing Tin Bronze Substrate Superhydrophobic Surface with Nanosecond Laser and Investigating its Wettability Transition Mechanisms

以锡青铜为基底，研究采用纳秒紫外激光代替飞秒激光制备金属超疏水表面的方法。通过改变激光加工参数制备了不同表面微观结构，并采用扫描电子显微镜和接触角测量仪对所制备的微观结构和润湿性进行了表征，通过X射线光电子能谱（XPS）分析了所制备的样片表面化学元素含量及其随时间的演变，对润湿性转变的机理进行了解释。研究结果表明，采用纳秒紫外激光可以在锡青铜基底制备类似飞秒激光加工得到的金属超疏水表面；激光加工后的样片润湿性随时间变化，转变机理是激光加工过程中生成的CuO在磷元素的催化脱氧作用下生成了本征疏水的Cu2O；在紫外激光能量密度为5.61 J/cm2下，激光扫描速度100 mm/s时，所制备的表面具有微纳复合结构的表面接触角超过150°，滚动角小于10°。
This paper presents the preparation of the tin bronze substrate superhydrophobic metallic surface with the nanosecond ultraviolet(UV)laser instead of femtosecond laser. The surfaces with different microstructures were prepared by changing laser processing parameters. The microstructure and wettability of the prepared surfaces have been characterized by the scanning electron microscopy and the contact angle measurement system. The content of chemical elements in the prepared surfaces have been analyzed by using the X-ray photoelectron spectroscopy. On this basis, the mechanisms of change in the wettability on the prepared surfaces over time is explained. The analysis results show that the superhydrophobic metallic surfaces on the tin bronze substrate should be prepared, using the nanosecond UV laser similar to the femtosecond laser. The wettability on the laser processed surfaces changes over time and the mechanisms of wettability change are due to the fact that the CuO formed during laser processing has been transformed to Cu2O under the catalytic deoxygenation of the phosphorus element in the tin bronze. With the UV laser energy density of 5.61 J/cm2 and the laser scanning speed of 100 mm/s, the static contact angle on the prepared metallic surface with dual scale micro-nanostructures is more than 150° and the contact angle hysteresis is less than 10°