飞秒激光

Abstract(#br)A process to fabricate superhydrophobic surfaces on metals and polymers is presented. Using high speed femtosecond laser pulses, surface structures have been created on metal surfaces and transferred onto Polydimethylsiloxane (PDMS) to achieve superhydrophobic surfaces. Various surface micro and nano structures are presented and their wetting properties are discussed. Water contact angles of over 150° with a roll off angle of less than 5° were achieved on the textured copper and PDMS surfaces.

Abstract(#br)Hypothesis(#br)Controlling the wetting behaviour of gallium-based liquid metal is highly desired for soft electronics applications. Currently, achieving durable and patternable liquid-metal-repellent surfaces by a simple and flexible method is challenging. The femtosecond laser has a remarkable ability to modify the morphology and wettability of a solid surface.

用于各种应用的新型纳米结构复盖功能表面的制备近年来备受关注。利用飞秒( fs )激光可以在蔗糖溶液中铝膜表面诱导出大面积随机分布的纳米尖晶石，其分布密度随激光脉冲能量和蔗糖与水的质量比而变化。经聚二甲基硅氧烷( PDMS )改性后的铝膜具有润湿性可调、水下超亲油性( ~ 0 ° )、超疏水( ~ 155.3 ° )、高附着力和环境稳定性等特点。进一步，在空气中Al膜一侧采用fs激光直写( LDW )，然后在蔗糖溶液中诱导纳米尖晶石，另一侧采用PDMS改性，制备了油水分离过滤器。经过上述处理后，该过滤器具有类似‘荷花效应’的低水附着力，可用于高效( 99.61 %   ~   99.63 % )和可回收油水分离。此外，滤池在空气中暴露7  个月以上仍保持较高的油水分离效率( 99.46 %   ~ 99.57 % )，表现出较强的环境稳定性。这种由fs激光制备的功能滤波器可应用于化工产品的分离过程、生物医学装置和环境保护等领域。