Researches About The Wettability On Copper And Aluminum Surfaces

Wettability is an important feature of the solid surface,which decided by thechemical composition and microstructure of the surface geometry. From the study ofthe lotus leaf self-cleaning surface and the superhydrophobic properties to now ,thesuperhydrophobic materials have been used widely in the self-cleaning glass on largebuilding, metal anticorrosion, anti-snow and anti-fog on automotive glass and antenna,camera zoom and the chip micro-flow control of biological analysis and so on,moreover, the research will help further broaden its new applications such as inwater-collection.Although superhydrophobic materials have made great process, the researcherscan get a kind of good superhydrophobic material by controlling the surface structuremorphology and modification by low surface energy organic chemicals. The studyhave beed done are concentrated more in the organic materials surface as its ownrelatively low surface energy, so it can reach superhydrophobic surface only byconstructing the surface topography. However, the metals surface are less studied forthe more large surface energy, it is more difficult to get a more rough morphology.Last year an ice-rain made the South wire icing, power transmission was destructed,which lead to the inconvenience to the local people. Based on the above two points,wo set our goal to study the copper and aluminum surfaces. We know they widelybeen used in copper and aluminum wire, aircraft, radiator, as all can icing at a lowtemperature or wasting resources. Therefore, the wettability of the surface may be acritical issue to be resolved.The main research progresses of this thesis are shown as follow:1. We prepared superhydrophobic aluminum surface by chemical etchingmethod and the modification of low surface energy organic. The droplet wettability'schanges between room temperature and low temperature are studied, whichmechanism is explained. We also study the stability and corrosion resistance of thesuperhydrophobic surface, which has a good guide to the application.2. We fabricate copper superhydrophobic films by a low-pressure-oxidationmethod. The lotus-leaf-like superhydrophobic copper was fabricated by a faciletwo-steps method without the chemical organic modifying .We study the influence ofvarious parameters on contact angle. As the surface is a semiconductor, we study thecontact angle's changes before and after UV irradiation and the cycle test. 3. We successfully prepared basic copper carbonate superhydrophobic filmswith similar chemical method. The difference is the latter need modified by a lowsurface energy organic. The influence of various react parameters on the morphologyand the contact angle are studied. At last, we discussed their formation theory.