Global ETD Search

41	Evolution and Environmental Degradation of Superhydrophobic Aspen and Black Locust Leaf Surfaces Tranquada, George Christopher 17 July 2013 (has links) The current study is focused on the characterization of four natural leaf species (quaking, bigtooth and columnar european aspen as well as black locust) possessing a unique dual-scale cuticle structure composed of micro- and nano-scale asperities, which are able to effectively resist wetting (superhydrophobic), characteristic of The Lotus Effect. Scanning Electron Microscopy (SEM) was used to track the growth and evolution of their distinctive nano-scale epicuticular wax (ECW) morphologies over one full growing season. In addition, the stability of their superhydrophobic property was tested in various environments. It was determined that the long-term stability of these surfaces is tentatively linked to various environmental stress factors. Specifically, a combination of high temperature and humidity caused the degradation of nano-scale asperities and loss of the superhydrophobic property. The dual-scale surface structure was found to provide a suitable template for the design of future superhydrophobic engineering materials. Superhydrophobic surfaces environmental degradation evolution of superhydrophobic leaves dual-scale roughness wear and erosion of leaf surfaces aspen and black locust leaf surfaces evolution of leaf surfaces superhydrophobic leaf surfaces cuticular damage micro and nano-scale roughness biomimetics nanomaterials epicuticular wax morphologies sensitivity to environmental stresses micro-structured materials nano-structured materials nano-scale platelets materials science nanotechnology materials engineering 0794
42	Evolution and Environmental Degradation of Superhydrophobic Aspen and Black Locust Leaf Surfaces Tranquada, George Christopher 17 July 2013 (has links) The current study is focused on the characterization of four natural leaf species (quaking, bigtooth and columnar european aspen as well as black locust) possessing a unique dual-scale cuticle structure composed of micro- and nano-scale asperities, which are able to effectively resist wetting (superhydrophobic), characteristic of The Lotus Effect. Scanning Electron Microscopy (SEM) was used to track the growth and evolution of their distinctive nano-scale epicuticular wax (ECW) morphologies over one full growing season. In addition, the stability of their superhydrophobic property was tested in various environments. It was determined that the long-term stability of these surfaces is tentatively linked to various environmental stress factors. Specifically, a combination of high temperature and humidity caused the degradation of nano-scale asperities and loss of the superhydrophobic property. The dual-scale surface structure was found to provide a suitable template for the design of future superhydrophobic engineering materials. Superhydrophobic surfaces environmental degradation evolution of superhydrophobic leaves dual-scale roughness wear and erosion of leaf surfaces aspen and black locust leaf surfaces evolution of leaf surfaces superhydrophobic leaf surfaces cuticular damage micro and nano-scale roughness biomimetics nanomaterials epicuticular wax morphologies sensitivity to environmental stresses micro-structured materials nano-structured materials nano-scale platelets materials science nanotechnology materials engineering 0794
43	Dispositifs optoélectroniques à base de semi-conducteurs organiques en couches minces Brunner, Pierre-Louis Marc 08 1900 (has links) No description available. Cellules solaires organiques Photovoltaïque Diodes organiques électroluminescentes Matériaux à bande interdite étroite Petite molécule de type push-pull Morphologie des films minces Matrices polymères Polymères électroluminescents Gabarit organique Patron nanométrique Substrats de NaCl Gaufre de silicium Rayon ionique focalisé Recyclage Rendements quantiques Réglage d’émission Goussets polymères Masse molaire des polymères Organic solar cells Photovoltaics Organic light-emitting diodes Low bandgap materials Push-pull small molecules Thin film morphologies Polymer matrices Polymer pockets Polymer molar mass Electroluminescent polymers Emission tuning Quantum yield Recycling Tin-doped indium oxide (ITO) Transmission electron microscopy Focused ion beam Silicon wafer NaCl substrates Organic templates Nano-patterning

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