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Mostrando 13-24 de 494 artigos, teses e dissertações.
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13. Solvothermal Synthesis of Cerium-Doped Titania Nanostructured Materials Modified with Acetylacetone for Solar-Driven Photocatalysis
This study reports the preparation of nanostructured cerium-doped titanium dioxide photocatalysts containing different cerium concentrations by a modified sol-gel route involving the use of acetylacetone. The nanocrystalline powders had their structural, morphological, and optical properties characterized by X-ray diffraction, vibrational and Raman spectrosc
J. Braz. Chem. Soc.. Publicado em: 2020-01
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14. Tadalafil-loaded PLGA microspheres for pulmonary administration: preparation and evaluation
Tadalafil, a long-acting PED-5 inhibitor, is commonly used for the treatment of pulmonary arterial hypertension (PAH). However, its efficacy and clinical application are severely limited by the poor water solubility, low bioavailability and a series adverse effects (e.g. headaches, indigestion). In this study, tadalafil was prepared and loaded into biodegrad
Braz. J. Pharm. Sci.. Publicado em: 20/12/2019
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15. Obtenção de ferritas de cálcio dopadas com cromo visando aplicação em esmaltes transparentes brilhante e mate
RESUMO Este trabalho tem como objetivo obter óxidos com estrutura tipo espinélio de composição CaFe1,8Cr0,2O4 pelo método gelatina, visando aplicação em esmaltes transparentes brilhantes e mate. Os pós precursores, resultantes do processo de síntese, foram calcinados a 600 °C e a 800 °C para a obtenção da fase espinélio. Os pós foram caracteri
Matéria (Rio J.). Publicado em: 25/11/2019
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16. Preparation and characterization of yttria stabilized zirconia (YSZ) films deposited by dip-coating on LSM-YSZ substrate with different proportions
ABSTRACT In this work, sol-gel/dip-coating process for obtaining yttria stabilized zirconia (YSZ, ZrO2–8% Y2O3) films deposited onto LSM-YSZ (lanthanum strontium manganite (LSM, La0.7Sr0.3MnO3) mixed with YSZ) with different proportions (20/80, 50/50, 80/20) was investigated. The films were deposited on substrate varying the number of layers deposited. LSM
Matéria (Rio J.). Publicado em: 25/11/2019
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17. Síntese de perovskitas tipo LaAl1-xCrxO3 para aplicação em esmalte transparente
RESUMO No Brasil, estudos sobre pigmentos cerâmicos ainda são bastante escassos. Por esta razão, grande parte dos pigmentos consumidos pela indústria cerâmica são importados dos países europeus. Outra parte destes pigmentos são obtidos pela rota cerâmica, entretanto, esta rota de síntese resulta em pigmentos com propriedades bastante heterogêneas,
Matéria (Rio J.). Publicado em: 25/11/2019
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18. Preparation of novel blue phosphate pigments in imitation of turquoise
Resumo Como novo pigmento azul, vários fosfatos hidratados de cobre e alumínio imitando turquesa, CuAl6(PO4)4(OH)8.4H2O, foram preparados misturando solução de nitrato de cobre, solução de nitrato de alumínio, ácido fosfórico e solução de hidróxido de sódio. Amostras com composição química semelhante à turquesa foram preparadas. Os pós obti
Cerâmica. Publicado em: 14/11/2019
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19. Development of a dehydrated product with edible film characteristics from mammee apple (Mammea americana L.) using Refractance Window drying
Abstract The Mammee apple (Mammea americana L.) is a widely grown fruit, popular in tropical areas, which is mainly consumed fresh. Refractance Window (RW) drying is used to produce food films, flakes, and powders, and may be an alternative to commercially used dry food production methods. The aim of this study was to obtain a dehydrated product from the pul
Food Sci. Technol. Publicado em: 11/11/2019
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20. Avaliação através da tomografia por coerência óptica do esmalte dentário após o uso de dentifrícios clareadores
Resumo Introdução Historicamente, materiais abrasivos, como mármore em pó, corais e cinzas ósseas, eram utilizados para higienização dentária. Com a evolução, tais materiais foram substituídos por dentifrícios aplicados em escovas dentais, com a mesma finalidade. Objetivo Avaliar, através da Tomografia por Coerência Óptica, o desgaste do esm
Rev. odontol. UNESP. Publicado em: 07/11/2019
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21. Characterization of Different Surface Layers Produced by Solid Boron-Nitro-Carburizing Thermochemical Treatment on AISI 1020
The aim of this study is to obtain and characterize surface layers on low carbon steel with the pack boron-nitro-carburizing process. Different mixtures of commercial powders (Turbonit® and Ekabor®) were used to investigate the case properties, microstructure and phases formation on AISI 1020 steel. A series of experiments were conducted in solid medium wi
Mat. Res.. Publicado em: 04/11/2019
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22. Microstructure and Electrical Characterization of Thermoelectric Nanocrystalline Bi2 Te3 Synthesized by Mechanical Alloying
Nanocrystalline bismuth telluride, Bi2Te3 has been synthesized by mechanical alloying (MA) the powder mixture composed of Bi and Te in the inert gas atmosphere within a short duration of 15 min. Microstructure characterization of the prepared powder has been investigated adopting the Rietveld’s method using X-Ray diffraction (XRD) data and analyzing high-r
Mat. Res.. Publicado em: 28/10/2019
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23. Molten Salt Synthesis of Bi2WO6 Powders and its Visible-Light Photocatalytic Activity
Bi2WO6 powders were synthesized by the molten salt method at 250-350 ºC using the mixture of Bi(NO3)3·5H2O and Na2WO4·2H2O as a precursor, and the mixture of LiNO3 and NaNO3 with a molar ratio of 27:33 as a molten salt, respectively. The effects of temperature and salt amount on the phase composition, morphology and photocatalytic activity under the visib
Mat. Res.. Publicado em: 21/10/2019
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24. Nanoparticles of Ni1-x Znx Fe2 O4 used as Microwave Absorbers in the X-band
Ferrites nanoparticles of Ni1-xZnxFe2O4 ferrites with x varying between 0 and 1, in steps of 0.2, were obtained by solution combustion synthesis (SCS) and dispersed in oil paint at the concentrations of 10, 20, 30 and 40% by ferrite weight of ferrite, with the aim of producing electromagnetic wave absorbing composites, in the X band (8-12 GHz). The ferrite p
Mat. Res.. Publicado em: 21/10/2019