Fabrication And Properties Of Several Kinds Of Superhydrophobicity Surfaces

Wettability is one of important characterics of material surface and possessesvery important applications in waterproof, antisepsis, catalysis, ore-dressing andlubrication. Superhydrophobic surfaces with self-cleaning ability have manypotential and practical applications in foundamental researchs, in industrial andagriculture production and everday lifes. The materials with dynamically controlledsurface wettability have also attracted extensive interest, which can bring aboutintelligent response to for external stimulus. Although many interrelated studies havebeen repoted, these methods have mostly serious defects, such as high preparationcost and complex process, so that they can not be applied in large area. So to look forand study simple, inexpensive, practical preparation methods of controllablewettability surfaces tunned by many factors is still a challenge.This thesis including three parts as follows:1. Composition oxide films with micro/nanoscale roughness were fabricatedon glass, zinc and copper substrates with some simple methods. Some novelsuperhydrophobic surfaces are obtained after these films were modified with somelow-surface compouds, such as stearic acid, dodecyl mercaptan and linearlow-density polyethylene, with water static contact angles of higher than150oC.Among them, dodecyl mercaptan modification induced a strongersuperhydrophobicity than other low surface energy materials in short time. Itsupplied a simple method for waterproof, snowdefence, antifreeze and metallicmaterials’protection.2．A superhydrophobic composite membrane containing carbon nanotube(CNT) and stearic acid film was successfully prepared in the nitrogen atmosphereand in the air atmosphere using a simple spraying method. The wettability of theprepared hybid film could be reversibly transformed from superhydrophobicity tosuperhydrophilicity when it was heated and cooled in sequence.3. Using an electroless replacement deposition method, dendrite gold film wasfabricated on zinc surface in HAuCl4etching solution. After modification withdodecyl mercaptan, the film surface showed superhydrobicity with a high water static contact angle of159.05°low rolling angle of5~8°. Combination of appropriatesurface roughness and low surface free energy were predominant reasons to leaded tosuperhydrophobicity.