A5079143495- Hydrogen embrittlement and corrosion behaviors in metals
- High Temperature Alloys and Creep
- Nuclear Materials and Properties
- Aluminum Alloy Microstructure Properties
- Advanced Cellulose Research Studies
- Advanced Materials Characterization Techniques
- Nuclear and radioactivity studies
- Fatigue and fracture mechanics
- biodegradable polymer synthesis and properties
- Microplastics and Plastic Pollution
- High-Temperature Coating Behaviors
- Congenital Anomalies and Fetal Surgery
- Lignin and Wood Chemistry
- High voltage insulation and dielectric phenomena
- Urban Development and Societal Issues
- Polymer composites and self-healing
- Polymer Nanocomposites and Properties
- Graphene and Nanomaterials Applications
Universidade Federal do Rio de Janeiro
2012-2021
Materia (United States)
2017
Abstract Cardanol‐furfuraldehyde/maghemite composites were prepared through a bulk polymerization aiming to produce magnetic green resins able absorb petroleum spilled on the water. Several techniques such as Fourier transform infrared spectroscopy, ultraviolet–visible spectrophotometry, wide angle X‐ray scattering, and small scattering used in characterization of materials. In addition, force oil removal capability tests also performed. Obtained materials presented good allied with...
Abstract A magnetic resin based on lignin produced using the Kraft process was prepared and characterized. The material, because of its aromatic/aliphatic balance, can be used in oil‐spill clean‐up processes. through bulk polycondensation lignin, cashew nutshell liquid, formaldehyde presence maghemite nanoparticles. obtained composites were studied by Fourier transform infrared spectroscopy, X‐ray diffraction, Small‐angle scattering. Cure degree, force, oil removal capability tests also...
Magnetic nanocomposites present several interesting uses. They are very useful in environmental recovery, drug delivery and sensor applications. However, sophisticated magnetic measurements complex high costs, which may sometimes prevent research on these materials. Therefore, this paper presents a force test, can be performed at relatively low cost produces results, to support the development of Specifically, polylactic acid (PLA)/maghemite were prepared characterized using Fourier...
Nickel Superalloy 718 was specially designed for high temperatures. However, due to an embrittlement phenomenon, its application is limited up 650 °C. This work presents a contribution the understanding of mechanism focusing on crack propagation kinetics responsible brittle fracture. manifestation known as OAIC (Oxidation Assisted Intergranular Cracking), although phenomenology resulting in such degradation not well understood. The approach problem accomplished solubilized condition by...
Under the harsh conditions imposed by processing or due to an "overheating event", superalloy 718 may be exposed very high temperatures, which can result in degradation of microstructure. The time under such temperatures short, as during welding process, long, reheating homogenization billets. Operational events accidents that induce also a source microstructural degradation. present work aims study effect temperature on microstructure nickel base 718. Samples were heated up 1300 °C air at...
Introduction. Myelomeningocele (MMC) is an embryologic neural tube defect. Aim. To determine defecatory habits in MMC patients older and younger than 4 years old according to medullary level factors affecting catharsis. Patient methods. Descriptive study of prospective cohort by multidisciplinary team at Posadas Hospital, from March 2003 2017. Inclusion criteria: catered. Exclusion colostomizated. Results. n = 301. Female: 54%. Age: 1 month 17 years. Median age: 3 GI: 178 ≤ GII: 123 > In...
Inconel 718 has been used for decades in nuclear and aerospace industries due to its good combination of strength oxidation resistance.However, approximately between 650 850ºC, a transition the fracture mode is observed, revealing an intergranular fracture.With increasing operation temperatures efficiency requirements, environmental embrittlement become relevant source limitation this alloy's applications.Because this, OAIC characterized by hot tensile testing at different deformation rates...