Caracterização microestrutural de materiais cerâmicos utilizando o programa de processamento digital de imagens Image J

Marcomini, Raphael Fortes; Souza, Dulcina Maria Pinatti Ferreira de

doi:10.1590/s0366-69132011000100013

Cited by 17 publications

(8 citation statements)

References 9 publications

(10 reference statements)

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“…At 800 °C the electrical conductivity is around 30% higher for the ZnO co-doped samples. Using ImageJ 17 , it was measured an average grain size of 0.7 ± 0.2 µm in the TZ8Y+ 0.5 wt% ZnO sample sintered at 1300 °C/ 2 h and an average grain size of 1.6± 0.3 µm in the reference TZ8Y sample sintered at 1400 °C/ 2 h. Since both samples have similar porosity and similar grain size, i.e., similar microstructural features, it is expected that this difference in electrical conductivity is not due to microstructural differences.…”

Section: Resultsmentioning

confidence: 99%

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Microstructural and Electrical Features of Yttrium Stabilised Zirconia with ZnO as Sintering Additive

Marcomini

Souza

2016

Mat. Res.

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Adding ZnO reduces sintering temperature of yttria stabilized zirconia. Adding up to 0.5 wt% of ZnO is possible to densify to 8 mol% yttria stabilized zirconia (TZ8Y) to 95% of relative density at 1300 °C, besides, the electrical conductivity increases about 30% at 800 °C when compared to pure TZ8Y with the same relative density and average grain size. These results show that TZ8Y co-doped with ZnO can be a potential electrolyte to solid oxide fuel cells and electrolyzer cells.

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Section: Resultsmentioning

confidence: 99%

“…The polished samples were analyzed by SEM coupled with EDS. Quantitative image analysis was performed using ImageJ (National Institute of Health) 17 .…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Microstructural and Electrical Features of Yttrium Stabilised Zirconia with ZnO as Sintering Additive

Marcomini

Souza

2016

Mat. Res.

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“…The mean diameter and mean porosity area of the fibers was measured using ImageJ 6.0 software. Data were obtained for 70 fibers and expressed as mean ± standard deviation …”

Section: Methodsmentioning

confidence: 98%

Poly(Lactic Acid) Fine Fibers Containing a Low Content of Superhydrophilic Multi‐Walled Carbon Nanotube Graphene Oxide Hybrid as Scaffolds for Biological Applications

Andrade

Grinet

Costa

et al. 2018

Macro Materials & Eng

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Herein, polylactic acid containing two different concentrations of superhydrophilic multiwalled carbon nanotube graphene oxide hybrid (MWCNT‐GO, 0.5 wt% and 5 wt%) is rotary‐jet spun. The morphological, thermal, and surface wettability properties are then evaluated. Biological properties, including cytotoxicity, fibroblast cell adhesion, and the overall bioactive effect, are also investigated. It is demonstrated that the thermal behavior is affected by the presence of MWCNT‐GO, as well as the crystallinity. The addition of MWCNT‐GO, even in small amounts, reduces the wettability property of the fibers, making them more hydrophobic. However, biological tests with these fibers show no cytotoxic effect in all fiber sample groups, even when MWCNT‐GO concentration is increased. Therefore, nano‐structured, porous, and biocompatible polymeric scaffolds are obtained, with a high surface area and with notable potential for tissue engineering applications.

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“…As análises morfológicas e as razões de cálcio/fósforo (Ca/P) foram verificadas por meio da microscopia eletrônica de varredura (MEV) e da espectroscopia de energia dispersiva de raios X (EDX) com o equipamento TESCAN, modelo VEGA3 com um EDX acoplado. Para a quantificação do tamanho médio dos grãos utilizou-se o programa computacional ImageJ, software de domínio público com código aberto, desenvolvido pelo National Institute of Health (NIH), Estados Unidos [29].…”

Section: Caracterizaçãounclassified

Análise comparativa da síntese de hidroxiapatita via estado sólido

et al. 2020

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RESUMOA hidroxiapatita é um fosfato de cálcio considerada como biomaterial utilizada em restaurações ósseas, uma vez que apresenta características semelhantes à fase mineral do tecido ósseo. Por possuir diversos métodos de obtenção, a síntese do pó de hidroxiapatita tem estimulado interesse de pesquisas acadêmicas e indústrias, pois as condições de síntese e dos reagentes influenciam na estrutura, morfologia e aplicação do composto final desejado. Este trabalho propende realizar um estudo comparativo sobre síntese do pó de hidroxiapatita utilizando reagentes iguais, por dois métodos diferentes: mecanoquímica e calcinação. A síntese da hidroxiapatita foi realizada pela reação de estado sólido utilizando como precursores, o hidróxido de cálcio e o fosfato monoácido de cálcio em quantidades estequiométricas. As caracterizações foram realizadas por difração de raios X, espectroscopia Raman, microscopia eletrônica de varredura, espectroscopia de energia dispersiva, densidade, porosidade e microdureza Vickers. Os difratogramas de raios X apresentaram única fase para o método mecanoquímico e mais de uma fase para o método de calcinação, as fases foram confirmadas após refinamento pelo método de Rietveld e o tamanho médio do cristalito foi calculado pela equação de Scherrer. A espectroscopia Raman evidenciou bandas dos modos vibracionais da hidroxiapatita. As micrografias caracterizaram as diferenças morfológicas ocorridas nas amostras devido a diferentes métodos de síntese e a espectroscopia de energia dispersiva indicou as razões cálcio/fósforo das amostras, classificando-a como cerâmica à base de fosfato de cálcio. Medidas de densidades e porosidades das amostras foram realizadas, utilizando o método do picnômetro, baseado no princípio de Arquimedes. Os valores encontrados foram satisfatórios, pois estão próximos a valores teóricos encontrados na literatura. Medidas de microdureza Vickers foram obtidas nas amostras, com o intuito de averiguar suas propriedades mecânicas. Os métodos empregados se mostraram eficazes na produção de pós da hidroxiapatita.Palavras-chave: hidroxiapatita, mecanoquímica, calcinação. ABSTRACTHydroxyapatite is a calcium phosphate considered a biomaterial used in bone restorations, since it has characteristics similar to the mineral phase of bone tissue. Due to its many methods of production, the synthesis of hydroxyapatite powder has stimulated interest of academic research and industries, as the conditions of synthesis and reagents influence the structure, morphology and application of the desired final compound. This work aims to perform a comparative study on hydroxyapatite powder synthesis using equal reagents by two different methods: mechanochemical and calcination. The synthesis of hydroxyapatite was performed by solid state reaction using as precursors, calcium hydroxide and calcium monoacid phosphate in stoichiometric quantities. The characterizations were performed by X-ray diffraction, Raman spectroscopy, scanning

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Caracterização microestrutural de materiais cerâmicos utilizando o programa de processamento digital de imagens Image J

Cited by 17 publications

References 9 publications

Microstructural and Electrical Features of Yttrium Stabilised Zirconia with ZnO as Sintering Additive

Microstructural and Electrical Features of Yttrium Stabilised Zirconia with ZnO as Sintering Additive

Poly(Lactic Acid) Fine Fibers Containing a Low Content of Superhydrophilic Multi‐Walled Carbon Nanotube Graphene Oxide Hybrid as Scaffolds for Biological Applications

Análise comparativa da síntese de hidroxiapatita via estado sólido

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