A5018413322- Diamond and Carbon-based Materials Research
- Advanced materials and composites
- Metal and Thin Film Mechanics
- Electrochemical Analysis and Applications
- Force Microscopy Techniques and Applications
- Electrochemical sensors and biosensors
- Analytical Chemistry and Sensors
- Inorganic and Organometallic Chemistry
- Graphene research and applications
- TiO2 Photocatalysis and Solar Cells
- Semiconductor materials and devices
- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- Advanced Photocatalysis Techniques
- Lubricants and Their Additives
- Water Quality and Pollution Assessment
- Phytochemistry Medicinal Plant Applications
- Anodic Oxide Films and Nanostructures
- Polymer Nanocomposite Synthesis and Irradiation
- Cellular and Composite Structures
- Phytochemicals and Antioxidant Activities
- Supercapacitor Materials and Fabrication
- Porphyrin and Phthalocyanine Chemistry
- Titanium Alloys Microstructure and Properties
- Heavy metals in environment
Universidade Federal do Amazonas
2011-2022
National Institute for Space Research
2007-2010
Diamond films grown on three-dimensional (3D) porous titanium substrate were obtained by hot filament chemical vapor deposition (HFCVD) technique. The growth parameters strongly influenced the film properties during this complex formation process. pressure inside reactor as well methane concentration showed their influence morphology, quality, and rate. substrates totally covered a diamond coating including deeper planes leading to 3D diamond/Ti composite material formation. sp2/sp3 ratio...
POROSITY CONTROL BY POWDER METALLURGY (P/M).Titanium is an attractive material for structural and biomedical applications because of its excellent corrosion resistance, biocompatibility high strengthto-weight ratio.The reactivity titanium in the liquid phase makes it difficult to produce by fusion.Powder metallurgy has been shown be adequate technique obtain samples at low temperatures solid-phase consolidation.The production compacts with different porosities obtained uniaxial pressing...
Titanium is an attractive material for structural and biomedical applications because of its excellent corrosion resistance, biocompatibility high strength-to-weight ratio. Power metallurgy was used in this work to prepare 3D porous titanium. The powders became fragile from hydrogenation process were able be obtain compacts with different porosities by uniaxial pressing sintering without applied pressure. Since hydrogen dissolves easily titanium form hydrides which have a strong influence on...
No presente trabalho, o estudo da influência morfologia e estrutura de eletrodos diamante dopados com boro baixa dopagem, preparados três dopagens (1000, 3000 8000 ppm), foi submetido a uma caracterização detalhada. Foi constatado que razão B/C influenciou dos filmes, resultando em diferenças nas características eletroquímicas trabalho. As melhores propriedades para aplicação na análise processos redox do ligante tiossemicarbazona seu complexo Ni2+ foram encontradas eletrodo ppm. A resposta...
In this work, the results related with pure titanium compacts processing by Powder Metallurgy techniques are presented. The chosen sintering of preforms route was used and parameters for internal interconnected porosity obtention described. A detailed morphological structural characterization performed Scanning Electron Microscopy (SEM) X-ray Diffraction measurements.
In this study, we analyzed the physical and socio-environmental conditions that characterize region adjacent to springs in Floresta Manaós environmental protection area, located Manaus, Brazil, monitored water quality of these based on physical-chemical parameters. The results analyses macroscopic impacts show little or no interference due anthropic actions first studied (S1), while, second spring (S2), degree preservation according parameters, was E (very bad). Other such as electrical...
Power metallurgy has been used to produce compacts by two different routes. In this work, porous three-dimensional (3-D) substrates were prepared the conventional pre-forms sintering method. Titanium powders uniaxial pressed at 110 Mpa and vacuum (1 x 10-5 Pa) sintered 1500 K. Another group of obtained space holder technique. Irregular shaped carbamide particles (210 – 250 m diameters) mixed Ti powders, sintered. Before heated 470 K for 3 h eliminate spacing agent. Nanodiamond films grown...
Currently, the search for a more economical alternative with adequate selectivity, sensitivity and reproducibility in determination of metallic ions is important development reliable methodologies these contaminants. This work investigates boron-doped micro/nano diamond electrode, different morphology structure compared to those discussed literature, detection copper iron aqueous ethanolic environments. Internal validation Square Wave Voltammetry was applied. The methodology submitted by:...