Sio2
Mostrando 25-36 de 841 artigos, teses e dissertações.
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25. Adsorção do corante reativo azul BF-5G por MCM-41 sintetizada a partir da argila Chocolate
Resumo A eficiência da sílica mesoporosa sintetizada e calcinada, utilizando argila como fonte de sílica, foi investigada quanto à sua capacidade de adsorver o corante reativo azul BF-5G. Os materiais foram caracterizados por difração de raios X (DRX), fluorescência de raios X por dispersão de energia (FRX-ED) e espectroscopia na região do infraverm
Cerâmica. Publicado em: 2020-09
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26. Síntese e caracterização de pó de mulita monofásico derivado de sol-gel
Resumo Pó precursor de mulita microfina de alta pureza de composição estequiométrica, 3Al2O3.2SiO2, foi sintetizado por rota sol-gel usando isopropóxido de alumínio e tetraetoxissilano. O pó precursor de mulita foi caracterizado por área de superfície BET, distribuição de tamanho de partícula, espectroscopia no infravermelho por transformada de F
Cerâmica. Publicado em: 2020-09
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27. THEORETICAL UNDERSTANDING OF MORPHOLOGICAL DISTRIBUTION OF HYDROGEN IN AMORPHOUS CALCIUM SILICATE HYDRATE
Determining the morphological distribution of hydrogen atoms in calcium silicate hydrate phase (C-S-H) is of great concern but challenging. In this work, based on the stoichiometric composition of (CaO)1.7(SiO2)(H2O)1.8, a series of amorphous Ca1.7•Si•(O)3.7-x•(OH)2x•(H2O)1.8-x models are constructed using Monte Carlo method, where x represents the m
Quím. Nova. Publicado em: 20/07/2020
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28. PHYSICAL AND MECHANICAL PROPERTIES OF PARTICLEBOARD FROM Eucalyptus grandis PRODUCED BY UREA FORMALDEHYDE RESIN WITH SiO2 NANOPARTICLES
ABSTRACT The use of nanoparticles appears to be a feasible option for improving the quality of a range of wood-based products. Studies show that they can improve both the physical and mechanical properties of wood and wood-based products. This preliminary study aimed to analyze the influence of SiO2 nanoparticles on the physical and mechanical properties of
Eng. Agríc.. Publicado em: 2020-06
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29. AN ELECTROCHEMILUMINESCENCE SANDWICH BIOSENSOR FOR THE DETECTION OF LIPOPOLYSACCHARIDE
A novel electrochemiluminescence (ECL) biosensor for the determination of lipopolysaccharide (LPS), a biomarker of endotoxemia, was designed. The nanoprobe (Ru1@SiO2-peptide) with a specific peptide (CIGKLHSAGK) labeled with a carboxyl functionalized Ru@SiO2 (Ru1@SiO2) was prepared by the acylation reaction. The ECL peptide biosensor was obtained by the stro
Quím. Nova. Publicado em: 2020-06
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30. Produção de geopolímeros utilizando cinza da casca de arroz como fonte complementar de sílica
Resumo O silicato de sódio é a fonte complementar utilizada na reação de geopolimerização. Entretanto, esse reagente é produzido em alta temperatura ou em autoclave a alta pressão, o que gera muito impacto ambiental. Visando a produção de geopolímeros mais ecológicos, produziu-se um silicato de sódio alternativo (ASW) a partir da dissolução da
Cerâmica. Publicado em: 2020-06
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31. Influência das propriedades microestruturais e morfológicas de argilas in natura na reatividade de resíduos de tijolos em uma matriz cimentícia
Resumo Características físicas, químicas e mineralógicas das argilas in natura utilizadas nas indústrias interferem no processo produtivo e produto cerâmico final. Foram caracterizadas argilas in natura de 4 indústrias do Sul do Brasil pelas técnicas de DRX, FRX, FTIR, DSC e MEV. Além disso, o potencial pozolânico também foi verificado com base no
Cerâmica. Publicado em: 2020-06
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32. Effect of LZSA glass-ceramic addition on the erosive wear of pressureless sintered alumina
Abstract This study aims to evaluate the influence of the 11.6Li2O-16.8ZrO2-68.2SiO2-3.4Al2O3 (mol%) glass-ceramic addition (LZSA, 7 to 21 vol%) on the erosive wear of alumina in comparison to values of pure alumina obtained from the literature. Thus, composites were prepared from three commercial alumina of different initial particle sizes. Specimens were o
REM, Int. Eng. J.. Publicado em: 2020-06
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33. The Tatuí Formation as a source of raw material in the ceramic pole of Santa Gertrudes (SP)
Abstract The importance of the Santa Gertrudes Ceramic Complex (SGCC) in the ceramic market is directly associated with the high quality of the Corumbataí Formation clays used in the manufacture of its products. Although the volumetric capacity of the Corumbataí Formation is able to meet the SGCC demand for the coming years, its industries are always in se
REM, Int. Eng. J.. Publicado em: 2020-03
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34. Salt stress alleviation by seed priming with silicon in lettuce seedlings: an approach based on enhancing antioxidant responses
ABSTRACT Seed germination and seedling growth are the stages most sensitive to salt stress, which can induce ion-specific effects and oxidative stress. Although silicon (Si) has been known to improve plant defense systems against stressful-conditions, little is known about seed priming with Si and mechanisms of Si-mediated alleviation of salt stress in seedl
Bragantia. Publicado em: 2020-03
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35. PREPARATION AND SIMULATION OF THE ON-LINE SiO2/S COATING FOR COKING INHIBITION IN THE INDUSTRIAL CRACKING FURNACE
Abstract Coke formation inside radiant coils is one of the main problems during thermal cracking of hydrocarbons. The on-line preparation of the coating for coking inhibition is a promising technology because it provides more flexibility to the operators on site. The SiO2/S coating was prepared on the inner surface of coils in an 8-year-served GK-VI industri
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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36. EVALUATION OF THE PHOTOCATALYTIC ACTIVITY OF SiO2@TiO2 HYBRID SPHERES IN THE DEGRADATION OF METHYLENE BLUE AND HYDROXYLATION OF BENZENE: KINETIC AND MECHANISTIC STUDY
Abstract Silica spheres coated with titania (SiO2@TiO2) were synthesized using chitosan as template. The N2 adsorption/desorption isotherms of the spheres point to meso and macroporous characteristics and the elemental mapping by EDS shows uniform distribution of Ti on the surface of the silica spheres, leading to formation of an amorphous structure (XRD). T
Braz. J. Chem. Eng.. Publicado em: 13/01/2020