Fabrication,Stability And Durability Of Superhydrophobic And Superoloephobic Metallic Surfaces

Surfaces with special wettability have been widely studied recently,among which superhydrophobic surfaces and superoloephobic surfaces are attractive because of their potential applications.Though many studies have been reported,the applications of this field still face challenges.The fabrication of outstanding superoloephobic surfaces via simple,efficient and inexpensive methods,together with the stability and durability of superhydrophobic and superoloephobic surfaces,are the main problems.In this thesis,a novel strategy to design re-entrant structures via 3D distributed nanostructures was proposed,by which copper based microcones/nanograss hierarchical superoloephobic surfaces were fabricated via an ultrafast laser ablation and chemical bath oxidation hybrid method.The surface showed excellent superoloephobicity with water and other low surface tension liquids including dodecane.Besides,the influence of micro-or nano-structure design on the superoloephobicity were studied.In this thesis,copper based microcones/nanotubes hierarchical superhydrophobic surfaces with excellent stability were fabricated via an ultrafast laser ablation,surface acid etching and chemical bath oxidation hybrid method.The as-fabricated surfaces could maintain the Cassie state under a pressure of 706 Pa,and showed a contact angle above 150° even under a pressure of 1234 Pa.Results proved the key role of hierarchical design in enhancing the stability of the surfaces.Besides,the role of microor nano-structure design on the stability were systematically studied.In this thesis,metallic microcones/nanoparticles hierarchical superhydrophobic surfaces based were efficiently fabricated via a two-step ultrafast laser ablation method.The protection of microstructures on nanostructures were analyzed,and the influence of structure or material on the durability of the hierarchical surfaces were discussed.With optimized parameters,tungsten based hierarchical superhydrophobic surfaces could withstand 70 abrasion cycles,28 min of solid particle impact or 500 tape peeling cycles to remain contact angles above 150° and sliding angles below 20°,demonstrating much better comprehensive durability than published results.