SONIA REGINA HOMEM DE MELLO CASTANHO

SONIA REGINA HOMEM DE MELLO CASTANHO

(Fonte: Lattes)

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Graduada em Engenharia de Materiais (UFSCar, Universidade Federal de São Carlos), Mestre em Tecnologia Nuclear (IPEN/USP, Universidade de São Paulo) e Doutora em Ciências Químicas-Cerâmicos (UAM/ES -ICV/CSIC, Universidad Autónoma de Madrid, Espanha e Instituto de Ceramica y Vidrio/CSIC de Espanha). Ela é Pesquisadora Senior e atualmente Gestora Adjunta em Pesquisa e Desenvolvimento do Centro de Ciências e Tecnologia de Materiais (CCTM) do Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEN-SP). É Professora da Universidade de São Paulo (USP), no programa de posgraduação Tecnologia Nuclear - Materiais. Coordenadora do grupo de pesquisas (GP/CNPq) em Materiais e Meio Ambiente. Principais áreas de atuação: - Energias Renováveis (células a combustível, catalizadores e biomassa), - Ambiental (mitigação, inertização e requalificação de efluentes e subprodutos de processos extrativistas e industriais, diretivas ambientais (RhOS, WEEE)), - Cerâmicas Biocompatíveis (vidros, compósitos multifuncionais para a implantologia). Experiência em gestão de Centro de Pesquisas, gestão ambiental, gestão de projetos, planejamento composicional de materiais, processamento coloidal, reologia, vidros e vitroceramicos, compósitos multifuncionais e nanoestruturas naturais. (Texto extraído do Currículo Lattes em 27 dez. 2021)

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Use of waste water glass as silica supplier in synthesis of pure and Mg-doped lanthanum silicate powders for IT-SOFC application
2019 - YAMAGATA, C.; LEME, D.R.; CASTANHO, S.R.H.M.
Water glass in alkali solution (Na2SiO3/NaOH) an abundant effluent, generated in the alkaline fusion of zircon sand, represents a potential silica source to be converted in useful silica technological application. Actually, the generation of energy by environmental-friendly method is one of the major challenges for researchers. Solid Oxide Fuel Cells (SOFC) is efficient and environmentally clean technique to energy production, since it converts chemical energy into electrical power, directly. Apatite-type lanthanum silicates are promising materials for application as an electrolyte in intermediate temperature SOFC (IT-SOFC) because of their higher ionic conductivity, in temperatures of range 600–700 °C, than conventional zirconia electrolytes. In this work, pure (La9,56(SiO4)6O2,34) and Mg-doped (La9,8Si5,7Mg0,3O26,4) lanthanum silicate were synthesized, from that rich effluent. Using the sol-gel followed by precipitation method, the single crystalline apatite phase of both silicates was obtained by thermal treatment at 900 °C of their precursors. Sintered ceramic samples reached density of higher than 90%.
Synthesis and sintering behaviour of the lanthanum chromite doped with strontium and cobalt for SOFC interconnect applications
2007 - SETZ, L.F.G.; CORREA, H.P.S.; YAMAGATA, C.; MELLO CASTANHO, S.R.H.
Lanthanum Chromite has been the main candidate as interconnect material for high temperature fuel cell applications, SOFC. So all researches on the direction to clarify some aspects of this material continue to be an interesting contribution to understand and modify the behavior of the Lanthanum Chromite in use. The effort of this work is attaining doped Lanthanum Chromite by combustion synthesis, optimizing the parameters of the synthesis process and studying the influence of the conditioning powder process as milling, atmosphere and temperature of the sintering and also additives concentration on the final density, crystalline structures and expansion thermal behavior. The main characterization techniques used were BET determinations, Archimedes density method, dilatometry, scanning electronic microscopy, X ray diffraction and Rietveld method for refinements of the phases quantification. The homogeneous Lanthanum Chromite doped with Strontium and Cobalt with sintered densities around 97th% and thermal expansion coefficient compatible for SOFC applications (12x10-6°C) were attained with control of the adequate concentrations additives, synthesis conditions, the control of the atmosphere, time and temperature of the sintering process.
Synthesis of Lanthanum silicate oxyapatite by a new water-based sol-gel process using Nasub(2)SiOsub(3) as the source of silica
2011 - YAMAGATA, CHIEKO; MATOS, JIVALDO R.; MELLO CASTANHO, SONIA R.H.
Synthesis of Lasub(9,33)Sisub(6)Osub(26) oxyapatite powders by new modified sol-gel route: application as electrolyte for SOFC
2013 - YAMAGATA, CHIEKO; MISSO, AGATHA M.; PAIVA, MAYARA R.S.; CASTANHO, SONIA R.H. de M.
Sol-gel for synthesis of apatite-type lanthanum silicate powders
2010 - YAMAGATA, CHIEKO; RESTIVO, THOMAZ A.G.; MELLO CASTANHO, SONIA R.
Interconectores para aplicações em SOFC
2003 - YAMAGATA, C.; SETZ, L.F.G.; LIMA, S.S.; CASTANHO, S.R.H.M.
Synthesis characterization and sintering of cobalt-doped lanthanum chromite powders for use in SOFCs
2010 - YAMAGATA, CHIEKO; MELLO-CASTANHO, SONIA R.H.
Doped lanthanum chromite is a promising as interconnect material because of its good conductivity at high temperatures and its stability in oxidizing and reducing atmospheres. Perovskite oxide powders of Co-doped lanthanum chromite were synthesized by dispersing precursor metal salt solutions in a polymer matrix followed by a thermal treatment. XRD patterns showed that a highly crystalline cobalt-doped lanthanum chromite was obtained. Fine perovskite powder with a surface area of 6.15 m2 g -1 calcined at 700oC for 1 h, were obtained. After the sample sintered at 1450oC for 3h, the powder reached high densities exceeding 97% of the theoretical density. The proposed here has proved to be a very promising technique for the synthesis of lanthanum chromite powders.