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Preparation And Characterization Of Super-hydrophobic Surface On Several Different Substrates

Posted on:2015-02-24Degree:MasterType:Thesis
Country:ChinaCandidate:Y JuFull Text:PDF
GTID:2181330422483444Subject:Chemical Engineering
Abstract/Summary:PDF Full Text Request
The wetting property of a solid surface is one of the most important features relating to the material applications. It is associated closely with biological phenomena in nature, industrial and agricultural production and our daily life. The special wetting property of the plants, especially lotus leaf, is named lotus effect. At present, the superhydrophobic surfaces are prepared usually through two methods: one is to modify the surface with micro-nanoscale composition structure using low surface energy of the material, the other is to construct directly micro-nanoscale composition structure on low surface energy of solid surface. The first one is more available for easy and convenient modifier selection.In this thesis, cheap and convenient materials including cotton, glass and zinc plate were respectively employed as substrates and through simple situ reduction method, seed growth method and electroless deposition technique proper micro-nanoscale roughness surfaces were successfully constructed. After modification by lauryl mercaptan, these surfaces showed excellent superhydrophobic properties. Their possible applications in oil-water separation, anti-bacteria and resistance to corrosion were studied.1. A seed growth method combined with dodecyl mercaptan passivation technology was exploited to prepared superhydrophobic/superoleophylic cotton based materials. Reducing Sn2+species were first adsorbed onto the surface of negatively charged cotton obtained by NaOH solution treatment through a electrostatic interaction. Then [Ag(NH3)2]+was reduced in situ to form nanoscale silver seeds on the surface of cotton. After the cotton was immersed in a seed growth solution consisted of tartaric acid, silver ammonia solution and glucose for a given time, a proper roughness of surface structure was successfully constructed. Further modification with dodecyl mercaptan initiated a good superhydrophobic and superoleophylic property. The material has been successfully applied for oil-water separation and the separation efficiency reached87.26%. 2. Superhydrophobic anti-bacterial surfaces were prepared through a seed growth technique combined with dodecyl mercaptan modification on surface hydroxylized grass slide substrates. The maximum contact angle of water droplet on the surface reached152.59°and roll angle was less than5°. The obtained surfaces possessed durable and excellent anti-bacterial propery.3. A wonderful composition structure consisted of nanoscale flowers and leaf-like micro-plates was constructed on zinc plate substrate through immersing it in copper sulfate solution. Further passivation with dodecanethiol induced superhydrophobicity with a higher water contact angle of155.00°and lower rolling angle of less than5°. The effects of the experimental conditions on the surface wettability were tested.
Keywords/Search Tags:superhydrophobic materials, micro-nano-composite structure, silvernanoparticles, dodecyl mercaptan, oil-water separation, antibacterial
PDF Full Text Request
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