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Étude de la réactivité de surface par mesure d'angle de contact : influence de la fonctionnalisation et de la structure. Applications aux films d'oxyde de zinc électrodéposés

Chantal Badre
Abstract : In this work, we studied the surface reactivity by contact angle measurements. Wettability phenomenon is based on the nature of the interactions between a liquid and a surface. In our case, we were particularly interested in preparing textured surfaces with different roughness scales. Roughness is a key parameter to increase surface wettability. Firstly, we have prepared smooth polyvinylchloride polymers acidified with lauric acid. Then, aerosil balls are added to create some roughness on the polymer. In the two cases, acidity constants are calculated from a simple thermodynamic model. Controlling the roughness and the morphology of these polymers remain a main disadvantage that leaded us to use other materials with easier roughness control like Zinc Oxide (ZnO). We chose the electrodeposition method to synthesize this oxide. Different morphologies were prepared such like nanorods and nanowires. Wetting measurements are done on all these structures. It is well known that the wettability of ZnO can be modified by applying the bottom-up process. We used self assembled layers (SAMs) of organic molecules like octadecylsilane and fatty acids. The contact angles values are measured on all the samples and they are treated for each type of molecule. We succeeded to prepare superhydrophobic surfaces with the highest contact angle 176° ever obtained on ZnO. The study was extended and ferrocene probe molecules were used. ZnO modified with these redox SAMs were characterised by cyclic voltammetry and electrowetting. This final part is a preliminary study in the field of ZnO application as an electrochemical and/or biological sensor.
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Submitted on : Tuesday, March 17, 2009 - 8:00:00 AM
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Chantal Badre. Étude de la réactivité de surface par mesure d'angle de contact : influence de la fonctionnalisation et de la structure. Applications aux films d'oxyde de zinc électrodéposés. Chemical Sciences. Chimie ParisTech, 2007. English. ⟨pastel-00004902⟩

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