Aluminosilicates
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Influence of high-frequency microwave radiation on montmorillonite structure parameters
Resumo A influência da radiação micro-ondas nas alterações estruturais das partículas de montmorilonita foi estudada em uma amostra de argila montmorilonítica. Processos de longo alcance em múltiplas escalas foram induzidos nos aluminossilicatos naturais por radiação de micro-ondas de baixa e média potência (2,45 Hz, 750 W, 10 min). Amostras em p
Cerâmica. Publicado em: 14/11/2019
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2. Validation of a Standard Operating Procedure (SOP) for Forensic Soils Investigation in Brazil
ABSTRACT Soil traces are useful as forensic evidence due to their potential to transfer and adhere to different types of surfaces on a range of objects or persons. Several works have been developed in forensic soils, under different analytical approaches. However, in Brazil, only the researches from the Group of the Federal University of Paraná have develop
Rev. Bras. Ciênc. Solo. Publicado em: 09/09/2019
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3. Influence of Processing Variables on Clay-Based Ceramic Formulations
The properties of ceramic materials and microstructural changes are dependent on the raw materials from which they are made and on the manner in which they are processed, from the composition to the established thermal treatment, heating rate, and firing temperature. In this study, the influence of some processing parameters (formulation, maturation time, an
Mat. Res.. Publicado em: 11/03/2019
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4. Synthetic Aluminosilicates for Geopolymer Production
Abstract The use of geopolymer has been studied as a potential substitute for Portland cement due to lower CO2 emission and improvements on structural properties. Some of the major raw materials used in the manufacture of the geopolymer are: steel slag, fly ash and metakaolinite. Due to the impurities contained in these raw materials, the present study uses
Mat. Res.. Publicado em: 24/01/2019
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5. Fracture Properties of Geopolymer Concrete Based on Metakaolin, Fly Ash and Rice Rusk Ash
Geopolymers are exclusively mineral nature and are considered an alternative to materials based on Portland clinker, whose production accounts for about 5% of anthropogenic CO2 emissions in the world. The geopolymer cement concrete (GCC) may be prepared from natural oxide-aluminosilicates such as metakaolin (MK), or synthetic, such as fly ash (FA) together w
Mat. Res.. Publicado em: 17/11/2017
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6. ESTUDO QUÍMICO DE EFLORESCÊNCIAS SALINAS DO SÍTIO ARQUEOLÓGICO TOCA EXÚ DO JURUBEBA DO PARQUE NACIONAL SERRA DA CAPIVARA, PIAUÍ, BRASIL
Toca Exú do Jurubeba is part of a set of archaeological sites located in the Serra da Capivara National Park (Piauí, Brazil), a region of great world interest due to its archaeological potential, especially rock art. However, rock art is constantly threatened by both natural and anthropic factors. Among the natural salts efflorescences that are deposited o
Quím. Nova. Publicado em: 2017-09
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7. A Straightforward Method for Determination of Al and Na in Aluminosilicates Using ICP OES
The improvements on aluminosilicates dissolution through microwave-assisted acid decomposition procedures for Na and Al quantification by inductively coupled plasma optical emission spectrometry (ICP OES) are reported here. Complete dissolution of the samples is achieved employing 4 mL of HNO3 and 3-4 mL of HF thus reducing the total amount of these reactant
J. Braz. Chem. Soc.. Publicado em: 2017-08
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8. Kaolinite removal from bauxite by flotation
Abstract This paper presents a potential condition to separate kaolinite through flotation when it is present in bauxite ore. This research anticipates a Brazilian industry requirement, considering the tendency towards the need for aluminosilicates removal from bauxite ores, as has already occurred in China. Kaolinite is the most abundant aluminosilicate, an
REM, Int. Eng. J.. Publicado em: 2016-09
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9. Efeito da ativação alcalina dos aluminossilicatos nas propriedades mecânicas e microestruturais de compósitos argilosos prensados / EFFECT OF ALKALINE ACTIVATION OF THE ALUMINOSILICATES ON THE MECHANICAL AND MICROSTRUCTURAL PROPERTIES OF COMPRESSED CLAY COMPOSITES
Na cadeia da energia e do combustível automotor, dentro da política mundial de adoção de tecnologias verdes, o governo brasileiro vem incentivado à instalação de usinas de biodiesel, material que está sendo empregado como uma alternativa, menos poluente e de menor custo em substituição ao diesel e à gasolina. Na Paraíba, o Programa de Biodiesel f
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/03/2011
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10. Evaluación de matrices vítreas del sistema SiO2-Al2O3-CaO-MgO para fundentes aglomerados a través la basicidad óptica y criterios estructuro-químicos
The structural constitution and ionic or molecular nature of the glassy matrix in liquid aluminosilicates are governed mainly by the molar ratio O: (Si + Al), and during the welding process affect its thermodynamic, chemical and physical properties as well as in their interactions with the metal droplet and the weld pool. In aluminosilicate fusion, O2-ion in
Soldagem & Inspeção. Publicado em: 2011-06
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11. PRODUÇÃO E CARACTERIZAÇÃO DE ALUMINOSILCATOS LUMINESCENTES PARA APLICAÇÕES INDUSTRIAIS / PRODUCTION AND CHARACTERIZATION OF ALUMINOSILCATOS LUMINESCENT FOR INDUSTRIAL APPLICATIONS
Este trabalho teve como objetivo a produção e a caracterização de pós cerâmicos de aluminosilicatos de cálcio puro e dopado através dos métodos sol-gel protéico e de uma nova rota, a qual combina o método sol-gel protéico à síntese de estado sólido. O método sol-gel protéico utiliza água de coco (Cocos nucifera) como solvente de partida dos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/03/2010
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12. Blue thermoluminescence emission of annealed lithium rich aluminosilicates
The blue thermoluminescence (TL) emission of different thermally annealed (i) β-eucryptite (LiAlSiO4), (ii) virgilite-petalite (LiAlSi5O12) and (iii) virgilite-petalite-bikitaite (LiAlSi10O22) mixed crystals have been studied. The observed changes in the TL glow curves could be linked to simultaneous processes taking place in the lithium aluminosilicate lat
Brazilian Journal of Physics. Publicado em: 2010-09