Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"sol–gel chemistry"”.
-
Chimie Intégrative dédiée aux morphosynthèses de matériaux composites multi-échelles et étude de leurs applications en photoluminescence, photocatalyse et photovoltaïque
… This PhD project consists in creating complex solid architectures using interdisciplinary methods such as sol-gel chemistry or complex fluids physics. Therefore, it is possible to synthesize Titanium Dioxide macroscopic fibers or films which possess a hierarchical porosity. This organization …
-
Energy transfer and waveguide studies of Eu3+ and Tb3+ doped 2 SiO2-TiO2 glass prepared via the sol-gel route
… can reduce the performance of the amplifier. Sol-gel chemistry, combined with the dip-coating method is a means to develop rare-earth doped planar waveguides for such integrated optics components. The sol-gel process involves three main steps: first, a metal alkoxide (Si-alkoxide) in …
-
Development of a Humidity-Resistant Coating to Impart High Oxygen Barrier Performance to Food Packaging Films
… since water vapor molecules are readily soluble in typically hydrophilic resins. In this work, we demonstrate a 1 – 2 micron thick oxygen barrier coating, prepared on a 12 micron poly(ethylene terephthalate) substrate, that has oxygen transmission rates as low as 1.44 cc m<sup>-2</sup> …
-
Flame Retardant Effect of Ionic Liquid Capsules on Emulsion Paint
… in the academic world, as it is a novel “green” solvent that is non-volatile, non-flammable, chemically inert, and designable, thus they can be applied to various field. It also has the potential to be used as a flame retardant. Ionic liquid (IL) as a flame retardant (FR) additive can have great …
-
An Investigation of Electrostatic Interactions Between Organically Functionalized Silica Particles, Surfaces, and Metal Ions
… study were synthesized using standard sol gel chemistry with trialkoxysilane precursors as well. The functional groups used in this study include methyl (MTMOS) and aminopropyl groups (TEOS/APTES). Sol gel coatings incorporating carboxy and ammonium groups were also investigated but …
-
Hyperbranched polyalkoxysiloxanes, synthesis, characterization and applications
… reaction. Polyethoxysiloxanes are liquids and soluble in organic solvents. NMR and MALDI-ToF-MS analysis showed that the polymers obtained by the silanol route have a hyperbranched structure with some cycle formation. Rather similar polymers could be synthesized by the acetoxyroute, which is …
-
Fabrication of Polymersomes using Microfluidic Devices
… using copolymer-stabilized water/organic solvent/water (W/O/W) double emulsion templates. In the former case, the formation of polymersomes occurred at the interface of a flow-focused, copolymer-loaded solvent stream and a selective solvent in a simple microchannel cross junction. …
-
Development of hybrid inorganic/organic nanocomposites with enhanced thermal conductivity
… as TMMs, and the exploitation of their tunable chemistry to regulate interfacial thermal resistance, remain comparatively underdeveloped. The purpose of this work is to establish chemistry–structure–property guidelines for maximizing thermal transport in electrically insulating polymer …
-
Development of nitrogen doped resorcinol-formaldehyde gels for carbon capture
Resorcinol-Formaldehyde (RF) xerogels are organic materials that have been widely studied due to their industrially relevant characteristics, such as high surface areas, suitable pore size and pore volume on which target species can be adsorbed; additionally, RF gels have significant potential to …
-
Design of high-performance luminescent solar concentrators based on aggregation-induced emitters in organic-inorganic hybrid waveguides
Solar-harvesting systems that have the potential to be integrated into the urban built environment have attracted significant interest. However, traditional solar panels are not well-suited for many modern architectures, due to their bulky and rigid structure, and reduced performance in diffuse …
-
Isocyanate-derived organic aerogels: polyurethanes, polyureas, polyamides and polyimides
"Aerogels are 3D assemblies of nanoparticles with high open porosity and high surface area, and are pursued for their low density, low thermal conductivity, low dielectric constant and high acoustic attenuation. The foundation for those exceptional properties is their complex hierarchical solid …
-
New Organic/inorganic Hybrid Sol-gel Nanocomposite Materials For Raman Gain In Fiber Optics
… to achieve amplification is of interest in the chemistry and photonic communities. Raman gain is one method that has been proposed to passively amplify optical data transmission through a distributed process. Amplification is obtained through a nonlinear light scattering process where an optical …
-
MSC-LADEN SCAFFOLDS FOR OSTEOCHONDRAL REPAIR
… questa tesi è stato sviluppare e valutare idrogeli sol–gel sililati modulari come scaffold candidati contenenti cellule stromali mesenchimali per la riparazione osteocondrale. La gelatina, l’acido ialuronico e il chitosano sono stati funzionalizzati con gruppi alcossisilano per ottenere …