Metals Rare Earth
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Green Processing of Strategic Elements Based on Magnetic Nanohydrometallurgy
Magnetic nanohydrometallurgy (NHM) is a new process based on engineered superparamagnetic nanoparticles capable of performing as complexing agents for extracting and recovering strategic metals from mineral sources and urban wastes, as well as for removing hazardous elements from contaminated water. Its principles and application are reviewed in this paper.
J. Braz. Chem. Soc.. Publicado em: 2018-05
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2. Método hidrometalúrgico para reciclagem de metais terras raras, cobalto, níquel, ferro e manganês de eletrodos negativos de baterias exauridas de Ni-MH de telefone celular
A hydrometallurgical method for the recovery of rare earth metals, cobalt, nickel, iron, and manganese from the negative electrodes of spent Ni - MH mobile phone batteries was developed. The rare earth compounds were obtained by chemical precipitation at pH 1.5, with sodium cerium sulfate (NaCe(SO4)2.H2O) and lanthanum sulfate (La2(SO4)3.H2O) as the major re
Quím. Nova. Publicado em: 2014
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3. Avaliação da força de repulsão entre magnetos de neodímeo ferro boro usados em tratamentos intra e extra bucais / Evaluation of repulsion force between Neodymium Iron Boron magnets used for intra and extra oral treatments
Os magnetos de Neodímio Ferro Boro (Nd2Fe14B) apresentam excelentes propriedades magnéticas e compatibilidade biológica, embora sejam frágeis e possuam baixa resistência à corrosão. As forças de atração magnética de magnetos de terras raras têm sido empregadas em sistemas de retenção, principalmente associadas aos implantes osseointegráveis, e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2012
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4. Síntese e caracterização da difenil-4-amina sulfonato de cério (III) e sua aplicação como precursor do CeO2
The cerium oxide is a very useful material in a series of processes among which we highlight the automotive catalysts, where it acts as a regulator of oxygen. We studied the synthesis of complex diphenyl-4-amine sulfonate cerium (III) pentahydrate, Ce (C12H10NSO3) 3.5H2O, and its application as a precursor to the oxide CeO2. The complex was synthesized in aq
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2011
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5. Utilização de líquens como bioindicadores de contaminação atmosférica por radionuclídeos naturais e metais em região impactada por TENORM / The use of lichens as bioindicators of atmospheric contamination by natural radionuclides and metals in a region impacted by TENORM
The main aim of this thesis is to study the possibility of using lichen as bioincicator of atmospheric pollution in regions contaminated by radionuclides, metals and rare earth elements. Two regions were chosen, one in Pirapora do Bom Jesus, where a tin and lead industry is located, and a second one in Cubatão, where a phosphate fertilizer industrial comple
Publicado em: 2010
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6. Study of organic light-emitting devices using rare earth and transition metals complexes. / Estudo de dispositivos orgânicos emissores de luz empregando complexos de terras raras e de metais de transição.
This work presents the study of the Rare Earth (RE) and Transition Metals (TM) complexes, as emissive layers of Organic Light-Emitting Devices (OLEDs) designed, built and electro-optically characterized. The thin films were thermally evaporated or spin-coated. This research started with the study of Europium complex changing its central ligand (CL), which sh
Publicado em: 2008
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7. Desenvolvimento, caracterização microestrutural e mecânica de cerâmicas de SiC aditivadas com alumina e óxidos de terras raras / Development, microstructural and mechanical caracterization of SiC ceramics with alumina and rare earth oxides additions
Neste trabalho, são analisadas as propriedades mecânicas em temperatura ambiente (dureza e tenacidade à fratura) e em altas temperaturas (fluência compressiva), em amostras de cerâmicas de carbeto de silício (SiC) com adição de óxidos de terras raras (OTR) e alumina (Al2O3). O OTR é obtido pela calcinação de CTR (concentrado de terras raras - Nuc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/06/2006
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8. Development, microstructural and mechanical caracterization of SiC ceramics with alumina and rare earth oxides additions / Desenvolvimento, caracterização microestrutural e mecânica de cerâmicas de SiC aditivadas com alumina e óxidos de terras raras
In this work, the mechanical properties are determined at room temperature (hardness and fracture toughness) and high temperatures (compressive creep) of SiC ceramic samples with alumina (Al2O3) and rare earth oxides (REO) additions. The REO is obtained by REC (rare earth concentrate - Nuclemon) calcinations, which contains 76 wt % of yttria (Al2O3). Three c
Publicado em: 2006
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9. Desenvolvimento, caracterização microestrutural e mecânica de cerâmicas de SiC aditivadas com alumina e óxidos de terras raras / Development, microstructural and mechanical caracterization of SiC ceramics with alumina and rare earth oxides additions
Neste trabalho, são analisadas as propriedades mecânicas em temperatura ambiente (dureza e tenacidade à fratura) e em altas temperaturas (fluência compressiva), em amostras de cerâmicas de carbeto de silício (SiC) com adição de óxidos de terras raras (OTR) e alumina (Al2O3). O OTR é obtido pela calcinação de CTR (concentrado de terras raras - Nuc
Publicado em: 2006
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10. Estudo de propriedades estruturais, magneticas e magnetocaloricas de compostos a base de Gd, Ge e Si / Study of structural, magnetic and magnetocaloric properties of Gd, GE e Si based compounds
This work presents the results from structural, magnetic and magnetocaloric studies about some compounds based on Gd, Ge and Si. Structural studies include optical and electronic microscopy analyses, besides X-ray diffraction. Magnetic analyses are limited to measurements of magnetization as a function of temperature and magnetic field. Using these technique
Publicado em: 2006
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11. Caracterização parcial do material particulado atmosferico na região de Paulinia usando o modelo de receptores
The aim of this work was to study the contribution of the catalytic craker unit from Replan-Petrol Refinery of Paulínia -in the atmospheric particulate matter in the area of influence around this source using the receptor model. The catalytic craker units U220 and U220A release large amounts of an alumina and rare earth oxides based catalyst to the atmosphe
Publicado em: 2000
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12. Transições de fase e propriedades magneticas de compostos R-T
In this work we studied intrinsic and extrinsic magnetic properties of rare earth-transition metals compounds. The intrinsic magnetic properties of R(Fe,M)12 intermetallic compounds was systematically investigated. Emphasis was given to the determination of magnetic phase transitions and magnetocrystalline anisotropy field. Measurements of the temperature de
Publicado em: 1995