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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Yttria nettings by replica processing
2014 - SANTOS, S.C.; YAMAGATA, C.; ACCHAR, W.; MELLO-CASTANHO, S.R.H.
In the context of green economy supported and widespread by United Nations (UN), the renewable energy sources are the unique mechanism to universalize the access to energy. Face to this strategic direction of change is essential to develop efficient components for saving energy such as porous ceramics that associate light with mechanical strength. Thus, the objective of this work concerns to improve the homogeneity of porous size distribution of yttria porous ceramics by evaluating their morphology during replica processing. Samples were subject to immersion into 30vol% yttria aqueous suspensions during an interval from 1min to 120min and sintered through careful thermal conditions. Based on the results, the weight and morphology of porous structure samples were directly influenced by immersion time, whereby intervals from 30-120min showed the best final products.
Synthesis and processing of yttrium dysprosium-doped silicate
2016 - MELLO-CASTANHO, SONIA; SANTOS, SILAS C.; CAMPOS, L.L.; YAMAGATA, C.
Sol gel route was used to synthetize Dy-doped Ytrium disilicate (Dy- Y2Si2O7) powders. The well-defined composition was a concern of the precision of the synthesis process, which stoichiometrically controlled to attain single crystalline phase and obtain fine particles in order to use as raw material for prototyping of bioinspired matrix from Luffa Cylindrica (LCy). The surface of the LCy was carefully prepared by chemical attack and the rheological studies of the aqueous suspensions performed with the synthetized Dy-doped Ytrium disilicate was previously studied. The optimized conditions were used to obtain porous and homogeneous replicas. The pieces biomorphic structure shaped were sintered at 1500 °C / 7h. The prototype was tested as a device for illumination from the burning of biomass in flame and showed good yield. The disilicate emission thermoluminescence doped with dysprosium demonstrated enhance the lumen capacity of this device.
Processing, microstructure and thermoluminescence response of biomorphic yttrium oxide ceramics
2016 - SANTOS, S.C.; YAMAGATA, C.; CAMPOS, L.L.; MELLO-CASTANHO, S.R.H.
The present work reports a fast-direct bio-prototyping process using Luffa Cylindrica vegetable sponge to produce biomorphic yttrium oxide ceramics with reticulated-porous architecture and thermoluminescence response. Processing parameters as rheology of yttrium oxide suspensions, bio-template surface treatment and thermal decomposition of bio-template were investigated. Shear thinning suspensions of 30 vol% yttrium oxide with apparent viscosity of 243mPa.s provided a successful impregnation of samples, whereby bio-templates with smooth ceramic layer and hierarchical reticulated architecture were formed. By thermal treatment at 1600 degrees C for 2 h biomorphic yttrium oxide ceramics with porous microstructure and TL response at 150 degrees C and lambda=550 nm were produced. The proposed fast direct bio-prototyping process is suitable for the production of ceramic components with complex shape and demonstrates potential for general applicability to any bio-template. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Processing and thermoluminescent response of porous biomorphic dysprosium doped yttrium disilicate burner
2016 - SANTOS, S.C.; YAMAGATA, C.; CAMPOS, L.L.; MELLO CASTANHO, S.R.H.
Characterization of yttria nano structured materials for radiation dosimetry
2015 - SANTOS, S.C.; CAMPOS, L.L.; MELLO CASTANHO, S.R.H.
Bio-prototyping and thermoluminescence response of cellular rare earth ceramics
2016 - SANTOS, S.C.; YAMAGATA, C.; CAMPOS, L.L.; MELLO CASTANHO, S.R.H.
The use of renewable materials is essential toward green economy. Vegetable structures are abundant, exhibit complex hierarchically built shape and an architecture that is promising to form functional materials. In this work using a mixture of rare earth oxides, which contain around 57 wt% yttrium oxide, cellular ceramics by bio-prototyping from the vegetable sponge Luffa cylindrica were produced and the thermoluminescence response was evaluated. By colloidal processing aqueous suspensions with 25 vol% solids content, pH 10, 1 wt% deffloculant and 0.2 wt% binder exhibited shear thinning behavior and apparent viscosity suitable for replica method. By thermal treatment at 1600 ◦C for 2 h in air biomorphic rare earth ceramics with dense microstructure and reticulated architecture were produced.
Yttrium disilicate micro-cellular architecture from biotemplating of luffa cylindrica
2014 - SANTOS, S.C.; YAMAGATA, C.; SILVA, A.C.; SETZ, L.F.G.; MELLO CASTANHO, S.R.H.
Dispersed hydroxyapatite and modified bioglass 45S5 composites: sintering behavior of glass matrix ranging from 20 to 30 wt% in calcium oxide investigation
2014 - SILVA, A.C.; PARRA-SILVA, J.; SANTOS, S.C.; SETZ, L.F.G.; MELLO CASTANHO, S.R.H.; BRAGA, F.J.C.
Processamento coloidal de dissilicato de ítrio
2014 - SANTOS, S.C.; ACCHAR, W.; SILVA, A.C.; YAMAGATA, C.; MELLO CASTANHO, S.R.H.
Lighting by biogas burners: Perspectives on development in Brazil
2014 - SANTOS, SILAS C.; YAMAGATA, CHIEKO; MELLO CASTANHO, SONIA