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报道了一种通过皮秒激光加工快速制备钛酸锶(SrTiO3)单晶超亲水表面的方法。室温下,采用皮秒激光加工系统,在SrTiO3单晶表面刻蚀出整齐的周期性线排列沟槽结构,使SrTiO3单晶表面浸润性向亲水方向转变。研究了不同划线间隔对表面接触角大小的影响。结果表明:接触角的大小随划线间隔的变化而变化,间隔越大,接触角越大;当沟槽间隔小于150μm时,得到超亲水表面。其机理是:根据Wenzel模型,增大表面粗糙度可以使表面浸润性向亲水方向转变;并且沟槽结构产生了虹吸现象,也增强了亲水性。
A method of rapidly preparing a superhydrophilic surface of strontium titanate (SrTiO3) single crystal by picosecond laser processing is reported. At room temperature, a picosecond laser processing system was used to etch trenched periodically aligned groove structures on the SrTiO3 single crystal surface to change the wettability of the SrTiO3 single crystal surface to the hydrophilic direction. The effect of different scribing intervals on the contact angle of the surface was studied. The results show that the contact angle varies with the scribing interval. The larger the interval is, the larger the contact angle is. When the groove spacing is less than 150μm, the superhydrophilic surface is obtained. The mechanism is: According to Wenzel model, increasing the surface roughness can change the wettability of the surface to the hydrophilic direction; and the groove structure produces the phenomenon of siphon, but also enhances the hydrophilicity.