Navegação por Revista "Materials Chemistry and Physics"

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  • IPEN-DOC 23196

    SANTOS, S.C. ; RODRIGUES JUNIOR, O. ; CAMPOS, L.L. . Bio-prototyping of europium-yttria based rods for radiation dosimetry. Materials Chemistry and Physics, v. 199, p. 557-566, 2017. DOI: 10.1016/j.matchemphys.2017.07.063

    Abstract: The application of solid state dosimeters in radiation protection has grown significantly as consequence of advances in the development of dosimetric materials using rare earths. The conception of new dosimetric materials concerns synthesis methods, which control the evolution of material structure, including further processing steps as, shaping, drying, and sintering. The present study reports a full bio-prototyping approach to produce europium doped yttria rods with potential application in radiation dosimetry. Ceramic particles synthesized by hydrothermal route were characterized by Photon Correlation Spectroscopy (PCS), X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM). The effect of europium on promoting electronic defects in yttria host was evaluated by Electron Paramagnetic Resonance (EPR). Low pressure hydrothermal synthesis led to formation of rounded particles with mean diameter of 410 nm. Aqueous suspensions with 20 vol% of particles prepared at pH 10, and 0.2 wt% binder exhibited apparent viscosity of 213 mPa s, being suitable for bio-prototyping of rods. Sintering of shaped samples at 1600 degrees C for 4 h provided formation of dense ceramic rods. Europium-yttria rods containing 5 at.% Eu exhibited the most intense EPR response.


  • IPEN-DOC 25854

    GABBAI-ARMELIN, P.R.; FERNANDES, K.R.; MAGRI, A.M.P.; SILVA, A.C. da ; FORTULAN, C.A.; RENNO, A.C.M.. Characterization and cytotoxicity evaluation of bio-inspired bioactive Glass/Collagen/Magnesium composites. Materials Chemistry and Physics, v. 228, p. 201-209, 2019. DOI: 10.1016/j.matchemphys.2019.02.072

    Abstract: Bone fractures are a common clinical event related to trauma, aging or diseases. Since bone repair is complex, abnormal consolidation may occur or, even, non-union. Biomaterials have a key role in this context, since they can stimulate bone cell differentiation, accelerating the healing process. Bioactive glasses (BG) represent a promising class of biomaterials due to its high bioactivity and osteogenic potential. Nevertheless, the osteoconductive properties of BG may not be enough to stimulate consolidation in critical situations. Thus, it was hypothesized that enriching BG with other materials such as collagen (Col) and magnesium (Mg), trying to make a composite with similar properties to bone tissue, would constitute a more suitable graft for tissue engineering. This work aimed at obtaining BG/Col/Mg composites and evaluating their physicochemical features. Moreover, L929 and MC3T3-E1 cell culture studies were done to investigate the cytotoxicity of the composites. The results showed that Mg could be successfully introduced, at different percentages (1, 3 and 5%), into BG and BG/Col composites, improving mechanical properties and retaining the bioactivity of BG. Ca assay measurements demonstrated that reactions in the Mg/solution interface, i.e. reactions between Mg and the ions in the simulated body fluid (SBF) have led to an increased Ca uptake for compositescontaining 3 and 5% Mg compared to plain BG and BG/Col. In vitro studies showed that BG and BG/Col containing 1% of Mg were non-cytotoxic and biocompatible. This percentage of Mg is promising for forward works. Our data on the present BG/Mg and BG/Col/Mg-based composites are encouraging and may lead to further molecular and cell culture studies, and in vivo investigations to clarify the biological performance of these new biomaterials.

    Palavras-Chave: skeleton; toxicity; collagen; magnesium; glass; composite materials; skeletal diseases; biological repair; biological materials


  • IPEN-DOC 22554

    MAEDA, EDUARDO A.; SANTOS, ALESSANDRA F.; SILVA, LEONARDO G.A. ; SCHON, CLAUDIO G.. Chemical, physical and mechanical properties evolution in electron beam irradiated isotactic polypropylene. Materials Chemistry and Physics, v. 169, p. 55-61, 2016.

    Palavras-Chave: polymers; hardness; irradiation; spectrometers; ultraviolet spectrometers; recrystallization; chemical properties; physical properties; mechanical properties; polypropylene


  • IPEN-DOC 25203

    DONATUS, UYIME ; FERREIRA, RAPHAEL O.; MOGILI, NAGA V.V.; VIVEIROS, BARBARA V.G. de ; MILAGRE, MARIANA X. ; COSTA, ISOLDA . Corrosion and anodizing behaviour of friction stir weldment of AA2198- T851 Al-Cu-Li alloy. Materials Chemistry and Physics, v. 219, p. 493-511, 2018. DOI: 10.1016/j.matchemphys.2018.08.053

    Abstract: Anodizing behaviour of AA2198-T851 friction stir weldment and the corrosion behaviour of unpolished and polished weldments of the alloy have been investigated. Electrochemical and microscopic techniques were employed in the study. The results revealed that the manufacturing-process induced near-surface deformed layer significantly affected the corrosion behaviour of the weldment. Thus, the corrosion behaviour of the weldment in the polished condition (which is the common practice) was different from that of the unpolished one due to the presence of near-surface deformed layer. Anodizing as a corrosion protection method for the weldment caused the formation of pronounced non-uniform oxide layer thicknesses across the weld zones. This was because the weldment oxidized at a higher rate compared with the parent material (PM) due to an increased proportion of Li in solid solution in the stir zone of the weldment.

    Palavras-Chave: chemical reactions; corrosion; anodization; aluminium alloys; friction welding; pitting corrosion; surface properties; lithium alloys; copper alloys; microstructure


  • IPEN-DOC 20087

    FERREIRA, RAFAEL A.; TEDESCO, JULIO C.G.; BIRK, JONAS O.; KALCEFF, WALTER; YOKAICHIYA, FABIANO ; RASMUSSEN, NINA; PENA, OCTAVIO; HENRY, PAUL F.; SIMEONI, GIOVANNA G.; BORDALLO, HELOISA N.; LISBOA-FILHO, PAULO N.. Ferrimagnetism and spin excitation in a Ni-Mn partially inverted spinel prepared using a modified polymeric precursor method. Materials Chemistry and Physics, v. 146, n. 1-2, p. 58-64, 2014.

    Palavras-Chave: ferromagnetism; excitation; spinels; nickel; manganese; x-ray diffraction; antiferromagnetism; cubic lattices; inelastic scattering; lattice parameters; magnetic materials; magnetization; neutron diffraction; neutron reactions; oxides; space groups; spin; synthesis; temperature dependence; three-dimensional lattices; x radiation


  • IPEN-DOC 27392

    KODALI, DEEPA; UDDIN, MD-JAMAL; MOURA, ESPERIDIANA A.B. ; RANGARI, VIJAK K.. Mechanical and thermal properties of modified Georgian and Brazilian clay infused biobased epoxy nanocomposites. Materials Chemistry and Physics, v. 257, 2021. DOI: 10.1016/j.matchemphys.2020.123821

    Abstract: This study focuses on the preparation and characterization of nanocomposite system with bio-based epoxy resin (Super SAP 100/1000, contains 37% bio-based carbon content) and natural clays including Georgian clay and Brazilian clay. Georgian clay was surface modified using an ultrasound processing in presence of Decalin. Brazilian clay was modified to organophilic bentonite using quaternary ammonium salts. The resulting nano clay particles were characterized using XRD and TEM to confirm the particle size reduction and uniform distribution. The as-fabricated nanocomposites were characterized using flexure, DMA, TMA and TGA. The flexure analysis showed that the modified clay composites have significant improvement in strength (23–38%) and modulus (28–37%). Delayed thermal degradation was observed from TGA analysis which showed that the major degradation temperatures improved from 7°-25°C. DMA and TMA analysis showed improvements in storage moduli (4–6%) and coefficient of thermal expansion (CTE) (6–64%), respectively. The notable improvement in thermal and mechanical properties suggested the effective dispersion and the high degree of polymer particle interaction. The bio based content present in the Super Sap 100/1000 acts as plasticizer resulting in the extensive ductility of the polymer.

    Palavras-Chave: nanocomposites; epoxides; clays; mechanical properties; thermal degradation; bentonite; thermomechanical treatments; differential thermal analysis; calorimetry


  • IPEN-DOC 24370

    RIBEIRO, VILMARIA A. ; FREITAS, ISABEL C. de; O. NETO, ALMIR ; SPINACE, ESTEVAM V. ; SILVA, JULIO C.M. . Platinum nanoparticles supported on nitrogen-doped carbon for ammonia electro-oxidation. Materials Chemistry and Physics, v. 200, p. 354-360, 2017. DOI: 10.1016/j.matchemphys.2017.07.088

    Abstract: Pt nanoparticles supported on carbon (Pt/C) and nitrogen-doped carbon (Pt/NC) were prepared by an alcohol-reduction process and used for ammonia electro-oxidation in alkaline media. Nitrogen-doped carbons were prepared by thermal treatment of urea and Carbon Vulcan XC72 at 800 C under argon atmosphere. The obtained materials showed the presence of face centered cubic structure of Pt and mean particle sizes in the range of 3e3.7 nm. X-ray photoelectron spectroscopy results revealed that Pt/NC 5 (carbon prepared with 5% of urea) presents more Pt on the surface than Pt/C, and the nanoparticles are predominantly in the metallic state. The electrocatalytic activity was investigated by cyclic voltammetry and chronoamperometry experiments. Pt/NC materials showed a higher electrocatalytic activity for ammonia electro-oxidation than Pt/C, whereby the material Pt/NC 5 showed the peak current density 161% higher than Pt/C. The increase of activity might be related to the high electrochemically accessible area of Pt/NC and the improvement on the interaction with water due to the nitrogen onto the support which could contribute to the oxidation of intermediate products from ammonia electro-oxidation.


  • IPEN-DOC 22509

    SANTOS, S.C. ; YAMAGATA, C. ; CAMPOS, L.L. ; MELLO CASTANHO, S.R.H. . Processing and thermoluminescent response of porous biomorphic dysprosium doped yttrium disilicate burner. Materials Chemistry and Physics, v. 177, p. 505-511, 2016.

    Palavras-Chave: porous materials; nanostructures; ceramics; coatings; luminescence; luminescence; processing; dysprosium; doped materials; yttrium silicates


  • IPEN-DOC 16488

    MARTINS, T.S.; MAHMOUD, A.; CIDES da SILVA, L.C.; COSENTINO, I.C. ; TABACNIKS, M.H.; MATOS, J.R.; FREIRE, R.S.; FANTINI, M.C.A.. Synthesis, characterization and catalytic evaluation of cubic ordered mesoporous iron-silicon oxides. Materials Chemistry and Physics, v. 124, n. 1, p. 713-719, 2010.

    Palavras-Chave: porous materials; iron oxides; silicon oxides; catalysts; synthesis; ozonization


  • IPEN-DOC 22846

    SILVA, JULIO C.M. ; PIASENTIN, RICARDO M. ; SPINACE, ESTEVAM V. ; NETO, ALMIR O. ; BARANOVA, ELENA A.. The effect of antimony-tin and indium-tin oxide supports on the catalytic activity of Pt nanoparticles for ammonia electro-oxidation. Materials Chemistry and Physics, v. 180, p. 97-103, 2016. DOI: 10.1016/j.matchemphys.2016.05.047

    Abstract: Platinum nanoparticles supported on carbon (Pt/C) and carbon with addition of ITO (Pt/C-ITO (In2O3)(9)center dot(SnO2)(1)) and ATO (Pt/C-ATO (SnO2)(9).(Sb2O5)(1)) oxides were prepared by sodium borohydride reduction method and used for ammonia electro-oxidation reaction (AmER) in alkaline media. The effect of the supports on the catalytic activity of Pt for AmER was investigated using electrochemical (cyclic voltammetry and chronoamperometry) and direct ammonia fuel cell (DAFC) experiments. X-ray diffraction (XRD) showed Pt peaks attributed to the face-centered cubic (fcc) structure, as well as peaks characteristic of In2O3 in ITO support and cassiterite SnO2 phase of ATO support. According to transmission electron micrographs the mean particles sizes of Pt over carbon were 5.4, 4.9 and 4.7 nm for Pt/C, Pt/C-ATO and Pt/C-ITO, respectively. Pt/C-ITO catalysts showed the highest catalytic activity for ammonia electrooxidation in both electrochemical and fuel cell experiments. We attributed this to the presence of In2O3 phase in ITO, which provides oxygenated or hydroxide species at lower potentials resulting in the removal of poisonous intermediate, i.e., atomic nitrogen (N-ads) and promotion of ammonia electrooxidation. (C) 2016 Elsevier B.V. All rights reserved.

    Palavras-Chave: ammonia; ammonia fuel cells; amperometry; antimony; antimony oxides; carbon; electrochemistry; fcc lattices; hydroxides; indium; indium oxides; nanoparticles; nanostructures; oxidation; particle size; platinum; tin; tin oxides; voltametry; x-ray diffraction


  • IPEN-DOC 11405

    CORREA, E.C.S.; MELO FILHO, L.D.R.; AGUILAR, M.T.P.; MONTEIRO, W.A. ; CETLIN, P.R.. The effect of cyclic strining on the drawing stress of low carbon steel bars. Materials Chemistry and Physics, v. 94, n. 2-3, p. 376-381, 2005.

    Palavras-Chave: carbon steels; cold working; microstructure; strain softening; mechanical properties


  • IPEN-DOC 12281

    COSENTINO, I.C. ; MUCCILLO, E.N.S. ; MUCCILLO, R. . The influence of Fesub(2)Osub(3) in the humidity sensor performance of ZrOsub(2):TiOsub(2)-based porous ceramics. Materials Chemistry and Physics, v. 103, p. p. 407-414, 2007.

    Palavras-Chave: iron oxides; humidity; zirconium oxides; titanium oxides; ceramics; porous materials; microstructure; synthesis


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Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

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Ano de publicação: 2015

Para indexação dos documentos é utilizado o Thesaurus do INIS, especializado na área nuclear e utilizado em todos os países membros da International Atomic Energy Agency – IAEA , por esse motivo, utilize os termos de busca de assunto em inglês; isto não exclui a busca livre por palavras, apenas o resultado pode não ser tão relevante ou pertinente.

95% do RD apresenta o texto completo do documento com livre acesso, para aqueles que apresentam o significa que e o documento está sujeito as leis de direitos autorais, solicita-se nesses casos contatar a Biblioteca do IPEN, .

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O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

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1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.

2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.