SILAS CARDOSO DOS SANTOS
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Artigo IPEN-doc 29031 Synthesis of thulium-yttria nanoparticles with EPR response2022 - SANTOS, S.C.; RODRIGUES JUNIOR, O.; CAMPOS, L.L.Approaches to form new materials for radiation dosimetry are essential to enhance quality assurance and quality improvement practices based on radiation protection concept. The present work reports a hydrothermal synthesis based on a relative low temperature and pressure to form thulium-yttria nanoparticles with electron paramagnetic resonance response. Thulium-yttria nanoparticles were prepared and characterized by XRD, SEM, PCS, and EPR. According to results, the hydrothermal method provided thulium-yttria nanoparticles with cubic C-type structure, mean particle size (d50) less than 160nm, and EPR response. The EPR spectra of powders exhibited two resonance peaks p1 and p2 recorded at 350 and 160mT, respectively. The enhancement of the EPR response of yttria by the use of thulium as a dopant provide meaningful parameters to advance in the formation of new rare earth-based materials for radiation dosimetry.Resumo IPEN-doc 23700 Synthesis and processing of yttrium dysprosium-doped silicate2016 - 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.Artigo IPEN-doc 20512 Dispersed hydroxyapatite and modified bioglass 45S5 composites: sintering behavior of glass matrix ranging from 20 to 30 wt% in calcium oxide investigation2014 - SILVA, A.C.; PARRA-SILVA, J.; SANTOS, S.C.; SETZ, L.F.G.; MELLO CASTANHO, S.R.H.; BRAGA, F.J.C.Artigo IPEN-doc 20337 Processamento coloidal de dissilicato de ítrio2014 - SANTOS, S.C.; ACCHAR, W.; SILVA, A.C.; YAMAGATA, C.; MELLO CASTANHO, S.R.H.Artigo IPEN-doc 15843 Obtencao de membranas porosas a base de terras raras por processamento coloidal2010 - SANTOS, S.C.; MELLO CASTANHO, S.R.H.Artigo IPEN-doc 18374 Preparação de Scafolds constituidos por hidroxiapatita dispersa em biovidro2012 - SILVA, A.C.; APARECIDA, A.H.; SETZ, L.F.G.; SANTOS, S.C.; MELLO CASTANHO, S.R.H.; BRAGA, F.J.C.Artigo IPEN-doc 18384 Análise reológica de suspensões cerâmicas concentradas: abordagem viscoelástica2012 - SETZ, L.F.G.; SILVA, A.C.; SANTOS, S.C.; MELLO CASTANHO, S.R.H.; MORELLI, M.R.Artigo IPEN-doc 18386 Dissilicato de ítrio: síntese e processamento2012 - SANTOS, S.C.; YAMAGATA, C.; SILVA, A.C.; MELLO CASTANHO, S.R.H.Artigo IPEN-doc 19175 Yttrium disilicate stability in aqueous medium2013 - SANTOS, S.C.; ACCHAR, W.; SILVA, A.C.; YAMAGATA, C.; MELLO CASTANHO, S.R.H.Artigo IPEN-doc 19859 Vidros contendo resíduo galvânico: O metais de transição contribuem ou não na devitrificação?2013 - SILVA, A.C.; SETZ, L.F.G.; SANTOS, S.C.; MELLO CASTANHO, S.R.H.