X Rays Diffraction
Mostrando 1-12 de 102 artigos, teses e dissertações.
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1. Use of SnOx:F in the Recycling of Silicon Solar Cells
Amongst the many parts of a silicon cells photovoltaic module, silicon is the most important and expensive constituent. Thus, research on silicon recycling from damaged cells can lead to economic and environmental benefits. In this work, the broken silicon cells were tailored to function along with the fluorine-doped tin oxide as the transparent electric con
Mat. Res.. Publicado em: 22/01/2018
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2. Influence of Anodization Parameters in the TiO2 Nanotubes Formation on Ti-7.5Mo Alloy Surface for Biomedical Application
In this study, the effects of the parameters such as applied potential difference, time and annealing temperature in the titania nanotubes formation were evaluated. The morphology of the nanotubes was evaluted by using Field Emission Gun - Scanning Electron Microscope (FEG-SEM), Atomic Force Microscope (AFM), contact angle and X-rays diffraction (XRD). Self-
Mat. Res.. Publicado em: 24/07/2017
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3. Fabrication of Cathode Materials Based on Limn2o4/Cnt and Lini0.5mn1.5o4/Cnt Nanocomposites for Lithium – Ion Batteries Application
AbstractCarbon nanotubes (CNTs) are a promising candidate material for use in lithium batteries due to 1D tubular structure, high electrical, thermal conductivities, and extremely large surface area. In this work, the MWCNTs were purified by dispersion in a mixture of HNO3 and H2SO4acids. The oxidized-MWCNTs were used as conducting addition to prepare a nano
Mat. Res.. Publicado em: 2015-10
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4. New Flexible and Transparent Solution-Based Germanium-Sulfide Polymeric Materials
New flexible and transparent materials based on germanium sulfide were obtained using GeCl4 and 1,3-propanedithiol as precursors. These materials have transparency in the ultraviolet-visible (UV-Vis) spectral region (about 70%), thermal stability up to 200 °C and glass transition located at temperatures below 0 °C (-37 °C, -56 °C and -59 °C) as shown by
J. Braz. Chem. Soc.. Publicado em: 2015-05
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5. Synthesis and characterization of novel ZrO2-SiO2 mixed oxides
In this study the mixed oxides ZrO2-SiO2, were synthesized by the sol-gel method with a molar ratio of 95:5 (Si/metal) and characterized by X-ray diffraction, absorption-desorption of N2, Fourier transform infrared spectroscopy, thermal gravimetric analysis, temperature-programmed desorption of ammonia, and acidity test by titration. The synthesized material
Mat. Res.. Publicado em: 15/04/2014
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6. Titanium bioactivity surfaces obtained by chemical/electrochemical treatments
There are various surface treatments used to modify titanium surfaces to render it bioactive. In this study commercially pure titanium surfaces (cp Ti), grade 2 were modified by acid etching (AE) and anodic oxidation (OA) in order to evaluate the bioactivity in vitro of these surfaces using the simulated body fluid (SBF). The AE was realized using a mixture
Matéria (Rio J.). Publicado em: 2014-03
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7. Aumento da vida em fadiga por meio do processo de roleteamento profundo para geração de tensão residual compressiva
Este trabalho comprovou a eficácia do processo de roleteamento profundo no aumento da vida em fadiga em eixos submetidos ao ensaio de fadiga sob tensão axial. Uma pesquisa bibliográfica extensa foi realizada para o entendimento do comportamento físico do fenômeno encruamento, onde esta pesquisa abrangeu a metalurgia, plasticidade e elasticidade dos mate
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/04/2012
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8. Estudo do processo de esferolização de partículas vítreas visando a aplicação em radioterapia interna seletiva / Study of the spheroidization process of glass particles for selective internal radiotherapy
The selective internal radiotherapy is an alternative method to treat hepatocellular carcinoma. Glass microspheres containing radionuclides are introduced in the liver through the hepatic artery, and they are housed preferentially in the region where the cancer cells are located. The microspheres are trapped in the arterioles which feed the tumors, and the &
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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9. Nanocomposites of polyamide 6/residual monomer with organic-modified montmorillonite and their nanofibers produced by electrospinning
Nanocomposites of an organic-modified montmorillonite (MMT) and polyamide 6 (PA6) with a residual monomer were produced by melt mixing in a torque rheometer. By wide angle X-rays diffraction (WAXD), intercalated/exfoliated structures were observed in the PA6/MMT nanocomposites with 3 and 5 wt. (%) of MMT; on the other hand, when 7 wt. (%) of MMT was added, a
Materials Research. Publicado em: 07/08/2012
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10. Mg2FeH6-based nanocomposites with high capacity of hydrogen storage processed by reactive milling
The compound Mg2FeH6 was synthesized from a 2Mg-Fe mixture in a single process through high-energy ball milling under hydrogen atmosphere at room temperature. The complex hydride was prepared from Mg powder and granulated or powdered Fe using a planetary mill. The phase evolution during different milling times was performed by X-rays diffraction technique. T
Materials Research. Publicado em: 06/03/2012
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11. Análise de tensões residuais pela técnica de difração de raios X em processos de soldagem MIG / Analyses of residual stress by diffraction of x-rays in MIG welding processes
Nesse trabalho foram realizados experimentos para determinar as tensões residuais introduzidas no Aço A36, que é uma liga de baixo carbono e que é muito utilizado em vários setores da produção industrial, quando esta é submetida à soldagem do tipo MIG (Metal Gas Inert). A escolha desse tipo de soldagem foi para manter constantes os parâmetros que p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/03/2011
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12. Sistema para realização de medidas de luminescência com excitação por Raios X
In this work is presented a versatile system for X-ray excited optical luminescence (XEOL) measurements. The apparatus was assembled from a sample holder connected to an optical fiber responsibly for the acquisition of the scintillation signal. The spectrum is registered with a CCD coupled in a spectrograph provided with diffraction gratings. The system perf
Química Nova. Publicado em: 2011