预润湿对激光诱导铝基超疏/亲水表面润湿性的影响

Effect of pre-wetting on the wettability of laser ablated Al superhydrophobic/superhydrophilic surface

通过激光烧蚀制备了区域可控的超疏水/超亲水混合表面,研究了预润湿对水下和油下样品表面润湿性的影响,以及样品表面润湿的稳定性。结果表明,预润湿会改变样品表面的油下水接触角及水下油接触角,也会改变气泡在其表面的行为;样品经水浸泡、受热或曝露空气后,超亲水表面出现润湿性转变而超疏水表面较稳定。样品常温下密封保存能长期保持稳定性。研究结果对油水分离、油气分离、水性介质中的气泡控制具有重要意义。

A regionally controllable super hydrophobic/super hydrophilic mixed surface was prepared by laser ablation, and the effects of pre-wetting on the surface wettability of samples under water and oil were studied, as well as the stability of the surface wettability of samples. The results show that pre-wetting can change the oil contact angle underwater and water contact angle under-oil on the sample surface, and also change the behavior of bubbles on the surface. After the samples were soaked in water, heated or exposed to air, the super hydrophilic surface showed wettability transformation while the super hydrophobic surface was relatively stable. The sample can maintain long-term stability sealed dry preservation at room temperature. The results are of great significance for oil-water separation, oil-gas separation and bubble control in aqueous media.