Metallic Nanoparticles
Mostrando 13-24 de 57 artigos, teses e dissertações.
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13. Synthesis, Microstructural Characterization and Microhardness of AlCoNi-SiC Composite Prepared by Mechanical Alloying
Equiatomic AlCoNi alloy matrix were reinforced by the dispersion of SiC nanoparticles (SiCnp) using the mechanical alloying process. The metallic powders were milled for 10, 20 and 30 h and sintered at 1200 0C under vacuum. Through particle size distribution, X-ray diffraction and scanning electron microscopy investigations, the mechanically alloyed powders
Mat. Res.. Publicado em: 05/01/2017
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14. Spectroscopic synthetic optimizations monitoring of silver nanoparticles formation from Megaphrynium macrostachyum leaf extract
ABSTRACT Nanobiotechnology is one of the most promising areas in modern nanoscience and technology. Metallic nanoparticles have found uses in many applications in different fields, such as catalysis, photonics, electronics, medicine and agriculture. Synthesized nanoparticles through chemical and physical methods are expensive and have low biocompatibility. I
Rev. bras. farmacogn.. Publicado em: 2016-10
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15. Nanobiotechnology Solutions against Aedes aegypti
United Nations Children's Fund (UNICEF)/United Nations Development Programme (UNDP)/World Bank/World Health Organization (WHO) implemented the Training in Tropical Diseases (TDR) program with excellent results; however, due to current challenges, this active program requires new and innovative solutions. Nowadays, Aedes aegyptis-borne diseases can be added a
J. Braz. Chem. Soc.. Publicado em: 2016-06
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16. Nonlinear Optical Properties and Femtosecond Laser Micromachining of Special Glasses
Materials specially designed for photonics have been at the vanguard of chemistry, physics and materials science, driven by the development of new technologies. One particular class of materials investigated in this context are glasses, that in principle should exhibit high third order optical nonlinearities and fast response time, whose optical properties c
J. Braz. Chem. Soc.. Publicado em: 2015-12
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17. Synthesis, Characterization and Applications of Iron Oxide Nanoparticles - a Short Review
ABSTRACT: Iron oxide is a mineral compound that shows different polymorphic forms, including hematite (α-Fe2O3), magnetite (Fe3O4) and maghemite (γ-Fe2O3). Solid propulsion technology nanoparticulate materials, such as hematite and maghemite, exhibit high performance on thermal decomposition of ammonium perchlorate. The enhanced catalytic effect of metalli
J. Aerosp. Technol. Manag.. Publicado em: 2015-09
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18. Resonant properties, of modified triangular plasmonic nanoparticles with higher field concentration
In this paper, we present an analysis of the resonant response of modified triangular metallic nanoparticles with polynomial sides. The particles are illuminated by an incident plane wave and the method of moments is used to solve numerically the electromagnetic scattering problem. We investigate spectral response and near field distribution in function of t
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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19. Catalisadores de Pd metálico modificados por líquidos iônicos para a hidrogenação seletiva de compostos poli-insaturados
In this work, heterogeneous catalysts immobilized on supported ionic liquid (IL) were prepared, characterized and investigated in hydrogenation reactions of the substrates 1,5-cyclooctadiene (1,5-COD), trans-cinnamaldehyde (CALD) and nitrobenzene (NB). Two methods were used to prepare the catalysts. In the first, commercial Pd/C catalyst was coated with diff
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/08/2012
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20. Caracterização elétrica de filmes finos de telureto com nanopartículas de ouro depositados pela técnica sputtering. / Electrical characterization of tellurite thin films containing gold nanoparticles deposited by sputtering technique.
Este trabalho tem como objetivo a produção e caracterização elétrica de filmes finos de telureto com nanopartículas de ouro para aplicações em microeletrônica. Filmes finos foram produzidos por magnetron sputtering a partir de alvos de telureto cerâmico e de ouro metálico. Foi desenvolvida metodologia adequada para a nucleação das nanopartícula
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2012
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21. Preparação de vidros e vitrocerâmicas de óxidos de metais pesados contendo prata: propriedades ópticas, estruturais e eletroquímicas
Silver containing heavy metal oxide glasses and glass ceramics of the system WO3-SbPO4-PbO-AgCl with different AgCl contents have been prepared and their thermal, structural and optical properties characterized. Glass ceramics containing metallic silver nanoparticles have been prepared by annealing glass samples at temperatures above the glass transition and
Química Nova. Publicado em: 2012
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22. Síntese e estudo da atividade eletrocatalítica de óxidos de metais de transição e de nanopartículas de prata e ouro para a reação de redução de oxigênio / Synthesis and study of the electrocatalytic activity of transition metal oxides, and silver and gold nanoparticles for the oxygen reduction reaction
The oxygen reduction reaction (ORR) was studied on electrocatalysts composed by pure and mixed transition metal oxides of Mn, Co, and Ni, including spinel-like structures, and by Ag, Au, and Ag3M/C (M= Au, Pt, Pd e Cu) bimetallic nanoparticles, in alkaline electrolyte. The transition metal oxides were synthesized by thermal decomposition of their nitrates, a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/08/2011
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23. Propriedades optoeletrônicas de interfaces híbridas metal/semicondutor orgânico preparadas por deposição assistida por feixe de íons (IBAD) / Optoelectronic properties of interfaces hybrid metal / organic semiconductor prepared by ion beam assisted deposition (IBAD)
In this work, optoelectronic properties from organic light emitting devices (OLEDs), based on conjugated polymers with metallic cathode, which were deposited by ion beam assisted deposition technique (IBAD) were studied. The main objective of this work is to produce a hybrid non abrupt metal/polymer interface and to study its effects on electron injection. T
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/07/2011
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24. Síntese, caracterização e estabilização de nanopartículas de prata para aplicações bactericidas em têxteis / Synthesis, caracterization and stabilization of silver nanoparticles for bactericidal aplication in textiles
This work aimed the study of silver nanoparticles synthesized by chemical reduction to their application in textiles, exploiting the bactericidal power of metallic silver. After an introduction to nanotechnology, colloidal stabilization of nanoparticles and the properties of silver as a bactericidal agent, it was discussed the methods of synthesis by reducti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/06/2011