激光微织构与自组装对铝合金表面润湿性的影响

摘要

Micron texture was first introduced on aluminum alloy substrate by laser manufacturing.Subsequently,perfluorodecyltrichlorosilane (FDTS) was deposited on these surfaces by nanocoating technology through a self-assembly route to form hydrophobic/superhydrophobic aluminum alloy surface.Scanning electron microscope,surface profiler and contact angle measurement were used to characterize the surface properties,and wettability of specimens.The results indicate that the joint action of micron level rough structure of microtexture by laser manufacturing and SAMs plays an important role in preparing superhydrophobic surface.Contact angle of the water droplet on the substrate increases with pitch decreasing(50-100μm),and is related to the type of laser microtexture.The carrying capacity experiments of floating platform show that superhydrophobic surface is in accord with the Cassie-Baxter model state,and can effectively improve the carrying capacity of the floating platform.%利用激光加工在铝合金表面进行微织构,通过自组装工艺在微织构表面修饰有机硅烷分子膜,制备得到具有疏水/超疏水性表面.利用扫描电镜、三维形貌仪、接触角测量仪对微织构表面微观形貌和润湿性进行表征.结果表明:激光微织构具有的微米级粗糙结构与自组装分子膜的共同作用对超疏水表面的构建具有重要作用;接触角随激光微织构加工间距(50～100μm)的减小而增大,且与微织构的形貌类型相关.漂浮承载实验表明,超疏水表面符合Cassie-Baxter状态模型,且可有效提高平台的漂浮承载能力.