Zno
Mostrando 1-12 de 286 artigos, teses e dissertações.
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1. Análise do efeito da incorporação de nanopartículas de ZnO nas propriedades físicas e mecânicas de painéis MDF
Resumo O painel MDF pode sofrer mudanças dimensionais, o que compromete seu desempenho. Uma forma de melhorar o desempenho do painel é incorporar nanopartículas. A presente pesquisa estudou o efeito do uso de nanopartículas de óxido de zinco em diferentes teores (0%, 0,5% e 1,0%) em painéis MDF fabricados com resina ureia-formaldeído (UF), resina mela
Ambiente Construído. Publicado em: 2023
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2. Synthesis of TiO2/ZnO photoanodes on FTO conductive glass for photovoltaic applications
Abstract For oxide semiconductors for application in dye-sensitized solar cells (DSSCs), titanium dioxide conjugated with zinc oxide thin films was synthesized and characterized. The UV (ultraviolet) spectrum characterization showed a peak of absorbance at around 355 nm, with a band gap of 3.25 eV and reflectance around 85%. Such characteristics allowed the
Cerâmica. Publicado em: 2023
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3. Study of electrophoretic deposition of ZnO photoanodes on fluorine-doped tin oxide (FTO) glass for dye-sensitized solar cells (DSSCs)
Abstract Semiconductors, such as zinc oxide (ZnO), are used in different scientific fields, including energy. This study applied ZnO thin films on a photovoltaic cell, specifically a dye-sensitized solar cell (DSSC). ZnO was used in solar cells due to its characteristics such as electronic mobility. Electrophoretic deposition (EPD) is an efficient method to
Cerâmica. Publicado em: 2022
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4. EFFECT OF REACTION CONDITIONS ON PARTICLE SIZE OF ZNO NANOPARTICLES VIA CONTROLLED PRECIPITATION METHOD AND IN-VITRO ANTIBACTERIAL CAPACITY
High-yield ZnO spheroidal nanoparticles with an average diameter around 23 nm (≈ 25% frequency) and 30 nm (≈ 28% frequency) were obtained by controlled semicontinuous precipitation at low temperatures. This synthesis was obtained from hydrozincite (Zn5(CO3)2(OH)6) as primary nanoparticles. The Zn5(CO3)2(OH)6 nanoparticles were synthesized by hydrolysis o
Química Nova. Publicado em: 2022
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5. Zinc tungstate: a review on its application as heterogeneous photocatalyst
Abstract ZnWO4 crystallizes in a monoclinic wolframite-like structure, which has been studied for applications in heterogeneous photocatalysis for degradation, oxidation, and reduction of various contaminants. This type of tungstate has proved to be an efficient photocatalyst under both ultraviolet and visible light irradiation and, when ZnWO4 forms a hetero
Cerâmica. Publicado em: 2022
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6. High-barrier and antibacterial films based on PET/SiOx for food packaging applications
Abstract High-barrier and antibacterial materials have potential applications in the field of preservative packaging for fresh meat products. In this paper, UV irradiation and silane coupling agent (KH550) were used to modify the surface of SiOx coating on polyester (PET)/SiOx film to prepare the PET/SiOx/chitosan and PET/SiOx/chitosan-nano-ZnO composite fil
Food Sci. Technol. Publicado em: 2021-09
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7. Sintering mechanisms of partially stabilized zirconia (TZ3Y) with ZnO and Co3O4 as sintering additives
Abstract In this work, the sintering mechanisms of 3 mol% yttria-stabilized zirconia (TZ3Y) and TZ3Y containing 0.3 wt% of ZnO or Co3O4 were analyzed by determining the apparent activation energy of sintering from dilatometry data and observing the evolution of microstructure. Dilatometry test was performed at a heating rate ranging from 5 to 20 °C/min from
Cerâmica. Publicado em: 2021-06
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8. Indução de metabólitos secundários no estresse de nanopartículas em cultura de calos de Artemisiaannua L.
Resumo Nanopartículas são bio-elicitores conhecidos em biotecnologia de plantas. Diferentes concentrações de nanopartículas de ZnO, CuO e CoO foram usadas para o acúmulo aumentado de metabólitos secundários e atividades antioxidantes no calo derivado da raiz, parte aérea e folha de Artemisiaannua L. A biomassa do calo foi de alguma forma afetada em
Braz. J. Biol.. Publicado em: 2021-05
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9. Cold sintering and electric characterization of ZnO-BaTiO3 composites
Abstract The sintering is an essential step in the processing of ceramics materials. A number of researchers have reported new techniques for sintering. However, in general, the process still demands high temperatures. This paper reports the results of the cold sintering of ZnO-BaTiO3 composites. The microstructural, structural, and electric properties of th
Cerâmica. Publicado em: 2021-03
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10. Reusable Heterogeneous SnO2/ZnO Catalyst for Biodiesel Production from Acidified/Acid Oils
A catalyst comprised of SnO2 impregnated on ZnO nanowires, which presented remarkable ability to catalyze fatty acid esterification/transesterification reactions, is reported. For optimization of reaction conditions, artificially acidified soybean oil with 10 wt.% oleic acid was used as a model feed. The optimized conditions were: 150 °C, 6 h, 5 g of oil, c
J. Braz. Chem. Soc.. Publicado em: 2021-01
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11. Preparação, caracterização e atividade fotocatalítica de carvão ativado a partir de microalgas para degradação fotocatalítica do corante rodamina B
Resumo É notória a necessidade de adotar medidas que reduzam a persistência de poluentes no meio ambiente, a fim de promover o correto descarte e tratamento de efluentes. Este trabalho teve como objetivo preparar, caracterizar e avaliar a atividade fotocatalítica do carvão ativado obtido a partir da biomassa residual de microalga Chlorella pyrenoidosa p
Cerâmica. Publicado em: 2020-12
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12. Design, Synthesis, and Application of Colored Cobalt Pigments (Pink, Blue, Green)
The combination of white or colorless oxides (MgO, Al2O3, ZnO) with colorant ions (Co2+) generates colored pigments (pink, blue, green). The color is caused by the insertion of the colorant ion in the respective crystal lattices (periclase, alumina, wurtzite), as verified by X-ray diffraction. Absorption spectra in the visible region show analogous triplet b
J. Braz. Chem. Soc.. Publicado em: 2020-11