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51	Synthèse solvothermale supercritique de nanostructures d'oxyde de cérium / Supercritical solvothermal synthesis of cerium oxide nanostructures Slostowski, Cédric 07 December 2012 (has links) La synthèse contrôlée de nanoparticules constitue toujours un enjeu majeur en science des matériaux (pour des applications telles que la catalyse par exemple) et la voie «fluides supercritiques» permet de répondre en partie à ce challenge. Dans ce contexte, ce travail de thèse a été consacré à l’élaboration de nanostructures d’oxyde de cérium aux caractéristiques contrôlées (tailles, morphologies, propriétés de surface,…) par synthèse solvothermale supercritique. A partir de l’étude de l’influence des paramètres opératoires du procédé sur les caractéristiques physico-chimiques des nanomatériaux obtenus, des mécanismes de formation et de fonctionnalisation de surface ont été proposés. D’un point de vue applicatif, ces poudres ont été caractérisées qualitativement et quantitativement vis-à-vis de la capture réversible du CO2. / The controlled synthesis of nanoparticles remains of key importance in materials science (for applications such as catalysis for instance) and “supercritical fluids” processes allow partially addressing this challenge. In this context, this PhD work has been dedicated to the synthesis of cerium oxide nanostructures with controlled characteristics (size, morphology, surface property,…) by supercritical solvothermal approaches. Through the study of the influence of process operating parameters on physicochemical characteristics of the synthesized materials, formation and surface modification mechanisms have been proposed. From an applicative point of view, powders have been submitted to qualitative and quantitative characterization towards CO2 capture. Fluides supercritiques Fonctionnalisation Oxyde de cérium Capture réversible du CO2 Dopage Supercritical fluids Surface modification Cerium oxide CO2 capture Doped materials 660.284
52	Síntese e caracterização de manganito de neodímio dopado com estrôncio utilizado como catodo em células a combustível de óxido sólido de temperatura intermediaria VARGAS, REINALDO A. 09 October 2014 (has links) Made available in DSpace on 2014-10-09T12:53:21Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:58:56Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP SOLID OXIDE FUEL CELLS STRONTIUM DOPED MATERIALS NEODYMIUM MANGANITES SYNTHESIS POWDERS CATHODES ELECTRIC CONDUCTIVITY X-RAY DIFFRACTION SCANNING ELECTRON MICROSCOPY
53	Estudo do gradiente de campo elétrico e da estrutura eletrônica do ZnO dopado com Co e Cd e do HfOsub(2) dopado com Ta por cálculos de primeiros princípios / Study of electric field gradient and of electronic structure of znO co-doped with Co and Cd and of HfOsub(2) doped with Ta by means of first principles calculations PEREIRA, LUCIANO F.D. 09 October 2014 (has links) Made available in DSpace on 2014-10-09T12:34:00Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:01:05Z (GMT). No. of bitstreams: 0 / Tese (Doutoramento) / IPEN/D / Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP HYPERFINE STRUCTURE ELECTRIC FIELDS ELECTRONIC STRUCTURE ZINC OXIDES DOPED MATERIALS COBALT CADMIUM HAFNIUM OXIDES TANTALUM COMPUTER CODES
54	Desenvolvimento de um dosimetro termoluminescente de Lisub(2)Bsub(4)Osub(7):Tm.Producao, caracterizacao e estudos fisicos RZYSKI, BARBARA M. 09 October 2014 (has links) Made available in DSpace on 2014-10-09T12:30:45Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:01:02Z (GMT). No. of bitstreams: 1 01366.pdf: 2764676 bytes, checksum: eb0ee3f52111d5d6caca21c0dc82fd30 (MD5) / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP alkali metals lithium dosemeters thermoluminescent dosemeters rare earths doped materials luminescence dosemeters fluorine compounds gamma dosimetry lithium compunds measuring instruments
55	Estudo de interações hiperfinas em nanopartículas de Fesub(3)Osub(4) e Fesub(3)Osub(4) dopadas com gadolínio pela espectroscopia de correlação angular perturbada HUET, SARAH D.P. 09 October 2014 (has links) Made available in DSpace on 2014-10-09T12:42:28Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:01:49Z (GMT). No. of bitstreams: 0 / Dissertação (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP HYPERFINE STRUCTURE NANOSTRUCTURES PARTICLES MAGNETITE IRON OXIDES DOPED MATERIALS GADOLINIUM PERTURBED ANGULAR CORRELATION SPECTROSCOPY X-RAY DIFFRACTION TRANSMISSION ELECTRON MICROSCOPY
56	Sintese e caracterizacao de nanoparticulas magneticas de oxidos mistos de MnFesub(2)Osub(4) recobertas comm quitosona. Estudos da influencia na dopagem com Gdsup(3+) nas propriedades estruturais e magneticas / Synthesis and characterization of magnetic nanoparticles of mixing oxides of MnFe2O4 recovered with chitosan. Studies of the dopade influence with Gd3+ in properties structural and magnetic RIBEIRO, THATIANA G.D. 09 October 2014 (has links) Made available in DSpace on 2014-10-09T12:52:45Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:02:48Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP SYNTHESIS DOPED MATERIALS MAGNETIC PROPERTIES X-RAY DIFFRACTION MANGANESE FERRITE IRON COMPOUNDS GADOLINIUM OXIDES STRUCTURAL CHEMICAL ANALYSIS
57	Estudo, desenvolvimento e otimizacao de um laser de Ersup(3+):YLF emitindo na regiao de 3 'microns' bombeado 'por diodo / Study, development and optimization of a diode pumped Er3+:YLF laser emmiting in the 3 'micron'm region DEANA, ALESSANDRO M. 09 October 2014 (has links) Made available in DSpace on 2014-10-09T12:55:30Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:05:04Z (GMT). No. of bitstreams: 0 / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP DIODE-PUMPED SOLID STATE LASERS ERBIUM YTTRIUM FLUORIDES LITHIUM FLUORIDES PULSES OPTIMIZATION lasers surgery doped materials crystals biological materials tissues
58	Sintese, processamento e caracterizacao das meia-celulas de oxido solido catodo/eletrolito de manganito de lantanio dopado com estroncio/zirconia estabilizada com itria / Synthesis, processing and characterization of the solid oxide half-cells cathode/electrolyte of strontium-doped lanthanum manganite/yttria-stabilized zirconium CHIBA, RUBENS 09 October 2014 (has links) Made available in DSpace on 2014-10-09T12:27:23Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:06:51Z (GMT). No. of bitstreams: 0 / Tese (Doutoramento) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP SOLID OXIDE FUEL CELLS CATHODES ELECTROLYTES STRONTIUM DOPED MATERIALS LANTHANUM MANGANESE COMPOUNDS YTTRIUM OXIDES ZIRCONIUM OXIDES SYNTHESIS SPRAYS ELECTROCHEMISTRY
59	Efeito dos métodos de síntese e sinterização na densificação, estrutura, microestrutura e condutividade elétrica do galato de lantânio / Effects of the synthesis and sintering methods on the densification, structure, microstructure and electrical conductivity doped lanthanum gallate REIS, SHIRLEY L. dos 10 November 2014 (has links) Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2014-11-10T12:24:02Z No. of bitstreams: 0 / Made available in DSpace on 2014-11-10T12:24:02Z (GMT). No. of bitstreams: 0 / Tese (Doutorado em Tecnologia Nuclear) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP SYNTHESIS SINTERING MECHANICAL STRUCTURE MICROSTRUCTURE ELECTRIC CONDUCTIVITY DOPED MATERIALS LANTHANUM GALLATE PEROVSKITE PHASE STUDIES X-RAY SPECTROSCOPY SCANNING ELECTRON MICROSCOPY
60	Efeitos da atmosfera de sinterização e do tamanho de partícula na sinterização da céria-gadolínia / Effects of sintering atmosphere and the particle size on sintering of gadolinia-doped ceria BATISTA, RAFAEL M. 24 February 2015 (has links) Submitted by Maria Eneide de Souza Araujo (mearaujo@ipen.br) on 2015-02-24T17:23:36Z No. of bitstreams: 0 / Made available in DSpace on 2015-02-24T17:23:36Z (GMT). No. of bitstreams: 0 / Tese (Doutorado em Tecnologia Nuclear) / IPEN/T / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP SINTERING ATMOSPHERES PARTICLE SIZE GADOLINIUM OXIDES DOPED MATERIALS CERIUM OXIDES POWDERS ISOTHERMAL PROCESS STOICHIOMETRY GRAIN GROWTH ELECTRIC CONDUCTIVITY

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