Navegação Periódicos - Artigos 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 27737

    BENTO, RODRIGO T. ; CORREA, OLANDIR V. ; PILLIS, MARINA F. . On the surface chemistry and the reuse of sulfur-doped TiO2 films as photocatalysts. Materials Chemistry and Physics, v. 261, p. 1-7, 2021. DOI: 10.1016/j.matchemphys.2021.124231

    Abstract: The surface chemistry and recyclability of sulfur-doped titanium dioxide (TiO2) films was evaluated. The photocatalysts were grown by metalorganic chemical vapor deposition (MOCVD) at 400 ◦C. The films were sulfur-doped at 50 ◦C by using hydrogen sulfide (H2S) as sulfur source. The photocatalytic behavior of the films was measure by monitoring the methyl orange dye decolorization under visible light for several cycles. The films are formed only for the anatase crystalline phase. The results demonstrated that no structural modifications or significant differences in the morphology of the films occurred after their use. The sulfur-doped TiO2 films presented good photocatalytic activity, with an efficiency of 72.1% under visible light in its first use. The durability experiments suggest that even with the dye impregnation on the catalyst surface, the photocatalytic activity of the S-doped TiO2 films remained around 70% in the first 3 cycles, which allows their practical application for water treatment and purification under sunlight.

    Palavras-Chave: titanium oxides; sulfur; doped materials; films; vapor phase epitaxy; recycling; photocatalysis; surfaces; chemical vapor deposition


  • 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


  • IPEN-DOC 27736

    SANTOS, S.C. ; RODRIGUES JUNIOR, O. ; CAMPOS, L.L. . Towards a new promising dosimetric material from formation of thulium-yttria nanoparticles with EPR response. Materials Chemistry and Physics, v. 259, p. 1-7, 2021. DOI: 10.1016/j.matchemphys.2020.124005

    Abstract: Advances toward new materials for dosimetry application is essential to enhance quality assurance and quality improvement practices based on radiation protection concept. Face to this challenge the present work reports an approach to produce thulium-yttria nanoparticles with electron paramagntic resonance response by an alternative hydrothermal synthesis based on a relative low temperature and pressure. Distinct compositions of thulium-yttria nanoparticles with up to 2 at.%Tm (at.%, atomic percentage) were prepared and characterized by XRD, SEM, PCS, and EPR. The proposed synthesis method followed by thermal treatment of the precursor powder at 1100 ◦C for 2 h provided thulium-yttria nanoparticles with rounded shape, cubic C-type structure, and mean particle size (d50) less than 160 nm. Among all compositions formed, thulium-yttria nanoparticles prepared with 0.1%Tm presented the most remarkable EPR response. The production of fine thulium-yttria nanoparticles with EPR response supply meaningful parameters to advance in the formation of new dosimetry materials based on rare earths.

    Palavras-Chave: dosimetry; thulium oxides; yttrium; nanoparticles; rare earths; electron paramagnetic resonance; ceramics


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