Hydrothermal Treatment
Mostrando 25-36 de 54 artigos, teses e dissertações.
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25. Efecto del pH en la síntesis de hidroxiapatita en presencia de microondas
Synthetic hydroxyapatite, Ca10(PO4)6(OH)2, is a biomaterial used to reconstruct damaged bone tissue or to recover protheses. Indeed, the chemical composition and structure is similar to the mineral phase contained in the scheleton. This similarity favors the formation of bonds with the bone, it becomes then a biocompatible material. Hydroxyapatite may be obt
Matéria (Rio de Janeiro). Publicado em: 2010
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26. Adsorção do corante reativo laranja 16 de soluções aquosas por zeólita sintética
Coal fly ash, a waste generated in a coal-fired electric power plant, was used to synthesize zeolite by hydrothermal treatment with NaOH solution. This zeolite was used as adsorbent to investigate the adsorption kinetics and isotherm parameters of the reactive orange 16 (RO16) dye from aqueous solutions at different concentrations (1.3-15.4 mg L-1). Three ki
Química Nova. Publicado em: 2010
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27. Remoção de íons Zn2+, Cd2+ e Pb2+ de soluções aquosas usando compósito magnético de zeólita de cinzas de carvão
For this study, magnetic composite of zeolite-magnetite was prepared by mixing magnetite nanoparticles suspension with synthetic zeolite. The nanoparticles in suspension were synthesized by precipitating iron ions in a NaOH solution. The zeolite was synthesized from coal fly ash by alkaline hydrothermal treatment. The magnetic composite was characterized by
Química Nova. Publicado em: 2010
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28. APLICAÇÃO DE MÉTODOS VOLTAMÉTRICOS DE ANÁLISE NA ESPECIAÇÃO DE CROMO, SELÊNIO E ANTIMÔNIO EM MATRIZES SALINAS / APPLICATION OF VOLTAMMETRIC METHODS TO THE SPECIATION ANALYSIS OF CHROMIUM, SELENIUM AND ANTIMONY IN SALINE MATRICES
This work aimed to explore the speciation analysis of chromium, selenium and antimony, elements of clinical and geochemical relevance, in the saline samples seawater, hydrothermal fluid and hemodialysis fluid. These samples, although linked to different research areas, have many similarities relating to their chemical compositions or the presence of metallic
Publicado em: 2010
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29. ANALYSIS OF THE IRRADIATION AND THERMAL TREATMENT COMBINED EFFECT IN THE QUALITY OF MANGOES FOR EXPORTATION / Análise do efeito combinado da irradiação e do tratamento hidrotérmico nas características de qualidade de mangas para exportação
In this research the effect of the hydrothermal treatment and irradiation as a combined method of food conservation and disinfestations was studied, searching to optimize the impact over the final product desired characteristics. Tommy Atkins mangoes from Brazil were submitted to a combined treatment: thermal treatment (46o C, 70 min and 52 oC, 5 min) and ga
Publicado em: 2009
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30. Amido resistente obtido a partir de amido de leguminosas e de seus hidrolisados / Resistant starch from legumes starches and their hydrolysates
Resistant starch (RS) is the fraction of starch that does not suffer the action of digestive enzymes, showing similar behavior to that of dietary fiber. The aim of this study was to evaluate the amounts and characteristics of RS obtained from chick-pea and high amylose pea starches using different processes of molecular weight reduction. The natural or prege
Publicado em: 2009
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31. Estudo e caracterização de matérias-primas para o desenvolvimento de blocos sílico-calcários
The types of products manufactured calcium silicate blocks are very diversified in its characteristics. They include accessory bricks, blocks, products in dense material, with or without reinforcements of hardware, great units in cellular material, and thermal insulating products. The elements calcium silicate are of great use in the prefabricated constructi
Publicado em: 2009
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32. Descascamento de frutas cítricas pelo uso do tratamento hidrotérmico / Peeling of citric fruits by using Hydrothermal Treatment
The citrus fruit processing is justified for the difficulty of peeling of these fruits. Studies of peeling of Perasweet orange fruit accomplished at ESALQ-USP are showing the potential of the use of the hydrothermal treatment to facilitate the peeling of this variety. The oranges are immersed in hot water at 50ºC for 8 minutes. This process to make easy the
Publicado em: 2008
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33. INFLUENCE OF SYNTHESIS PARAMETERS IN THE PROPERTIES OF MCM-22 ZEOLITE / INFLUÊNCIA DOS PARÂMETROS DE SÍNTESE NAS PROPRIEDADES DA ZEÓLITA MCM-22
MCM-22 zeolite was first synthesized by Mobil researchers in 1990. It is an aluminosilicate with molecular sieve characteristics and several applications in catalytic processes because of its two independent pore systems. In this work, the MCM-22 zeolite synthesis conditions were studied using both static as stirred hydrothermal treatment. Molar composition
Publicado em: 2008
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34. Sintese de materiais nanoestruturados MS IND. 2 (M = Mo, W) com alta pureza de fase e morfologia / Synthesis of MS IND. 2 (M = Mo, W) nanostructured materials with high purity of phase and morphology
The main of this Dissertation is the preparation of nanostructured WS2 and MoS2 from a template reaction with the respective nanorods oxides. Molybdenum oxide nanorods with diameters around 100 nm and microscale lengths were prepared from MoO3·2H2O via a one step solvothermal reaction. The formation of MoO3 rods proceeds in acidic media at 180 °C. The oxid
Publicado em: 2008
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35. Avaliação do uso de ozônio e de outros tratamentos alternativos para a conservação do mamão papaia (Carica papaya L.)
Devido à alta perecibilidade do mamão papaia (Carica papaia L.), estudos póscolheita, com foco nas boas práticas de estocagem e transporte, são importantes na cadeia de comercialização desse fruto. O uso de ozônio (O3) tem sido recomendado como um tratamento alternativo aos compostos clorados tradicionais para o controle de podridões de diversos fru
Publicado em: 2008
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36. Formação de mesoporos na síntese de zeólitas ZSM-5 via nanomoldagem avaliação no craqueamento de n-decano / Formação de mesoporos na síntese de zeólitas ZSM-5 via nanomoldagem avaliação no craqueamento de n-decano
The use of zeolites in the cracking of hydrocarbons is limited because the molecules higher than 0.74 nm do not diffuse in their micropores. In the other hand, molecular sieves as MCM-41, MCM-48 ou SBA-15, whose diameters are up 10 nm for the two formers and up to 30 nm for the last, have low hydrothermal stability and catalytic activity. To overcome those l
Publicado em: 2008