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    激光加工超疏水表面的温度和压强稳定性的研究

    Effects of Temperature and Pressure on Cassie State Stability of Superhydrophobic Surfaces

    • 摘要: 为了研究激光加工超疏水表面的温度和压强稳定性,通过对超疏水材料的表面性质和接触角进行详细的实验和分析,探讨温度和压强变化对超疏水性能的影响规律。通过激光加工铝板并进行表面氟化处理来制备超疏水表面,探究接触角随实验温度和压强的变化规律。经过激光加工和氟化处理,表面上的水滴接触角受加工参数的影响较小;在间距与深度不变时,随着温度升高,接触角不断减小,尤其在交叉凹槽名义宽度为50 μm的表面上,液滴发生了从Cassie向Wenzel的润湿状态转变;超疏水表面上的液滴受压迫时,随着压强的增大,接触角呈现波动,并在一定时刻发生Cassie-Wenzel状态转变。激光加工表面的多尺度结构特征使得接触角随结构参数的变化并不明显;受热时液体表面张力降低和液体与表面的实际接触面积增大将使得接触角降低,甚至发生Cassie-Wenzel状态转变;表面上的微结构不连续性导致超疏水表面上的液滴受到压迫时其接触角发生波动。为超疏水材料的设计和应用提供理论支持。

       

      Abstract: This paper aims to investigate the effects of temperature and pressure on the stability of superhydrophobic surface performance. Through detailed experiments and analyses of the surface properties and contact angles of superhydrophobic materials, the influence of temperature and pressure variations on superhydrophobic performance is explored. Superhydrophobic surfaces were prepared by laser processing aluminum plates followed by surface fluorination treatment. The contact angle variation with experimental temperature and pressure were investigated.After laser processing and fluorination, the water droplet contact angle on the surface exhibited minimal dependence on processing parameters. When groove spacing and depth remained constant, the contact angle gradually decreased with increasing temperature. Notably, on surfaces with cross-groove nominal widths of 50 μm, droplets underwent a transition from the Cassie to Wenzel wetting state. Under compressive pressure, the contact angle displayed fluctuations as pressure increased, accompanied by an overall reduction in contact angle and eventual Cassie-Wenzel state transition. The multi-scale structural characteristics of laser-processed surfaces contribute to the insensitivity of contact angle to structural parameter variations; Heating-induced reduction in liquid surface tension and increased actual liquid-solid contact area lead to decreased contact angles and potential Cassie-Wenzel transitions; Microstructural discontinuities on the surface lead to contact angle fluctuations when a droplet on a superhydrophobic surface is pressed.

       

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