Electrons Microscopy
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. New Strategy for Streptavidin Detection Using AuNRs/PAAm Hydrogel Composites
Localized surface plasmon resonance (LSPR) is a collective oscillation of free electrons induced by the incident light in nanometric surfaces of conductive materials. Gold nanorods (AuNRs) have been studied for plasmonic devices due to their anisotropic properties. Herein, we report the construction of a specific biosensor using polyacrylamide (PAAm) as the
J. Braz. Chem. Soc.. Publicado em: 2020-09
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2. Study of PtPd Bimetallic Nanoparticles for Fuel Cell Applications
Bimetallic nanoparticles are of special interest for their potential applications for fuel cells, mainly for portable power applications. Among the bimetallic systems, Pt-Pd bimetallic nanoparticles have received great interest as they can be widely used as effective catalysts for various electrochemical reactions. In this work, Pt-Pd alloy bimetallic nanopa
Mat. Res.. Publicado em: 15/05/2017
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3. A Sensitive Voltammetric Determination of Anti-Parkinson Drug Pramipexole Using Titanium Dioxide Nanoparticles Modified Carbon Paste Electrode
In this study, a facile sensor based on TiO2 nanoparticles modified carbon paste electrode was developed for voltammetric determination of pramipexole in pharmaceutical formulations and biological samples. Surface of the fabricated electrode have been characterized using field emission scanning electron microscopy. Under the optimized experimental conditions
J. Braz. Chem. Soc.. Publicado em: 2017-04
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4. Characterization of basic oxygen furnace slag and granite waste mixtures to Portland cement production
Abstract The aim of this paper is to analyze mixtures of basic oxygen furnace slag and granite waste in order to produce Portland cement. X-ray patterns were carried out in both the basic oxygen furnace slag and granite waste. Then, mixtures were prepared to obtain the binary basicity of 0.5, 0.9 and 1.2. The mixtures were melted at 1500ºC. Two cooling step
REM, Int. Eng. J.. Publicado em: 2016-12
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5. DLC Films Grown On Steel Using An Innovator Active Screen System For PECVD Technique
In this work, an active screen plasma discharge system based technology was incorporated in a PECVD reactor for DLC films growth, making it a new development in DLC films deposition. In this case, the active screen system is used to seek better electrons confinement, which might result in high ions density due to the collisions number increase, leading to a
Mat. Res.. Publicado em: 07/07/2016
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6. PHOSPHORUS INCORPORATION INTO MULTIWALLED CARBON NANOTUBES / INCORPORAÇÃO DE FÓSFORO EM NANOTUBOS DE CARBONO DE PAREDES MÚLTIPLAS
The thesis addresses the incorporation of phosphorus atoms into the structure of multi-walled carbon nanotubes (MWCNTs) grown by the Spray Pyrolysis method. To this end, the concentration of ferrocene in the precursor was fixed in 2,0 wt %, while the concentration of triphenylphosphine (Ph3P) was varied from 0,15 to 0,65 wt %. Scanning and transmission elect
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2011
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7. Homogeneidade química, interfaces e defeitos estruturais em nanofios de semicondutores III-V / Chemical homogeneity, interfaces and structural defects in III-V semiconductor nanowires
O desenvolvimento de novos materias tem grande interesse devido à ocorrência de novos fenômenos e propriedades, as quais podem ser usadas em futuras aplicações tecnológicas. Em particular, nas últimas décadas, esforços imensos foram realizados buscando compreender nanomateriais e os efeitos da redução de tamanho e de dimensão. Entre os diferentes
Publicado em: 2011
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8. Optimizing the e-beam profile of a single carbon nanotube field emission device for electric propulsion systems
Abstract: Preliminary studies on field emission (FE) arrays comprised of carbon nanotubes (CNT) as an electron source for electric propulsion system show remarkably promising results. Design parameters for a carbon nanotube (CNT) field-emission device operating on triode configuration were numerically simulated and optimized in order to enhance the e-beam fo
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
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9. Caracterização microestrutural da decomposição de carbonetos eutéticos M2C em ferro fundido multicomponente do tipo Fe-2C-5V-5Cr-5Mo-5W tratados isotermicamente à 950ºC e 1.050ºC. / Microstructural characterization of M2C eutectic carbides decomposition in multicomponent cast iron of type Fe-2C-5V-5Cr-5Mo-5W isothermically heat treated at 950°C e 1.050°C.
Multicomponent White Cast Iron are high temperature wear resistant ferrous alloys, presenting eutectic MC and M2C carbides in their as cast structure. In the present work the decomposition microstructures of the metastable M2C carbide after heat treatments was characterized in a model multicomponent white cast iron with composition (in weight): 2 wt% C and 5
Publicado em: 2010
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10. Tensile behavior of lignocellulosic fiber reinforced polymer composites: Part I piassava/epoxy
The fibers extracted from the piassava palm tree, scientifically known as Attalea funifera, are among the stiffest lignocellulosic fibers being considered for polymer composite reinforcement. Characterization of piassava composites have been carried out for different polymeric matrices and mechanical tests. In this work the tensile properties of DGEBA/TETA e
Matéria (Rio de Janeiro). Publicado em: 2010
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11. Desenvolvimento e caracterização de blendas de polímeros biodegradáveis e polipirrol / Synthesis and characterization of polymer blends of biodegradable polymers and polypyrrole.
Neste trabalho, desenvolvemos blendas de polímeros biodegradáveis e polímeros condutores com objetivo de avaliar o potencial destes materiais para uso em aplicações biomédicas. O polímero condutor polipirrol (PPY) e os polímeros biodegradáveis poli(-caprolactona) (PCL) e poli(3-hidróxido de butirato) (P3HB) foram escolhidos devido à comprovada bio
Publicado em: 2009
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12. Contribuição para a sintese de diamante nanocristalino com dopagem de boro / Contribution towards the synthesis of boron doped nanocrystalline diamonds
This thesis presents a study of the growth and characterization of nano crystalline diamonds produced by the hot-filament chemical vapor deposition (CVD) with the introduction of boron during the growth process. Our objective was to produce samples with good electrical properties for field induced emission of electrons (FEE) to the vacuum. Characterization o
Publicado em: 2008