Zobrazeno 1 - 10 of 42 pro vyhledávání: '"S.P.A. Paz"'
1
Akademický článek
Green synthesis of LaCrO3 powder mediated by the extract of the Amazon rainforest native plant Himatanthus drasticus (Mart.) Plumel and their photocatalytic activity
Autor: R.S. Silva, Jr., R.S. Matos, R. Andrade, R.M.P.B. Oliveira, C.X. Resende, S.P.A. Paz, R.S. Angélica, N.S. Ferreira
Publikováno v: Journal of Materials Research and Technology, Vol 13, Iss , Pp 2006-2011 (2021)
Lanthanum chromite (LaCrO3) powder was successfully synthesized by plant-extract-assisted sol–gel method using milk of Janaguba (Himatanthus drasticus (Mart.) Plumel) as an eco-effective chelating agent. X-ray diffraction (XRD), Rietveld refinement
Externí odkaz: https://doaj.org/article/0fe57886f58d410a9c6b1c2ed0dea12c
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2
Akademický článek
Non-halogenated flame-retardant additive from Amazon mineral waste
Autor: L.G.S. Santos, S.P.A. Paz, E.J.S. Cunha, J.A.S. Souza
Publikováno v: Journal of Materials Research and Technology, Vol 9, Iss 5, Pp 11531-11544 (2020)
Halogenated flame-retardant additives typically release toxic gases during combustion, which has led to the search for substitutes. In an attempt to avoid this harmful effect on human health, the aim of this study was to investigate using a hydroxide
Externí odkaz: https://doaj.org/article/dafa72a919084da0875eac802ba92bb4
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3
Akademický článek
Ageing characteristics related to cation exchange and interlayer spacing of some Brazilian bentonites
Autor: A.L.V. Carmo, R.S. Angélica, S.P.A. Paz
Publikováno v: Heliyon, Vol 7, Iss 2, Pp e06192- (2021)
This study investigated the influence of cation type on the sodium deactivation of Brazilian bentonite varieties. Four bentonite clays were studied, including three mixed-cationic and one magnesium. Swelling and the main exchangeable cations (Na+, K+
Externí odkaz: https://doaj.org/article/67ee6917c1df493ebff0f7f0e9bbd183
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5
Green synthesis of LaCrO3 powder mediated by the extract of the Amazon rainforest native plant Himatanthus drasticus (Mart.) Plumel and their photocatalytic activity
Autor: S.P.A. Paz, Romualdo S. Silva, Rosane Maria Pessoa Betânio Oliveira, N.S. Ferreira, Robert Saraiva Matos, Cristiane Xavier Resende, R. Andrade, Rômulo Simões Angélica
Publikováno v: Journal of Materials Research and Technology, Vol 13, Iss, Pp 2006-2011 (2021)
Lanthanum chromite (LaCrO3) powder was successfully synthesized by plant-extract-assisted sol–gel method using milk of Janaguba (Himatanthus drasticus (Mart.) Plumel) as an eco-effective chelating agent. X-ray diffraction (XRD), Rietveld refinement
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5cbe47fd84cd8954c0aa985fca14b159
https://doi.org/10.1016/j.jmrt.2021.05.099
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7
A proposal for bauxite quality control using the combined Rietveld - Le Bail - Internal Standard PXRD method – Part 2: Application to a gibbsitic bauxite from the Paragominas region, northern Brazil
Autor: Rômulo Simões Angélica, S.P.A. Paz, Henrique Kahn
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
In the bauxite industry – exploration, beneficiation and refining – two main chemical parameters are used for quality control: available alumina (AvAl 2 O 3 ) and reactive silica (RxSiO 2 ) content. Both are determined using a wet chemistry proce
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0017fef775b955839e6f1de13af6f231
https://doi.org/10.1016/j.mineng.2018.03.039
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8
Optimization of the reactive silica quantification method applied to Paragominas-type gibbsitic bauxites
Autor: Rômulo Simões Angélica, Henrique Kahn, S.P.A. Paz
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
This study presents an optimization of the method used to quantify reactive silica (RxSiO 2 ) in gibbsitic bauxites, specifically those which contain no (or insignificant) quartz. In this work they are named as Paragominas-type Bauxites. A factorial
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9acda0f8d62b5a127fee6ff3f4d1ef84
https://doi.org/10.1016/j.minpro.2017.03.003
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9
A proposal for bauxite quality control using the combined Rietveld-Le Bail-Internal Standard PXRD method-Part 1:: hkl model developed for kaolinite
Autor: S.P.A. Paz, Henrique Kahn, Rômulo Simões Angélica
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
In the bauxite industry – exploration, beneficiation and refinery – two main chemical parameters are used for the quality control: available alumina (AvAl2O3) and reactive silica (RxSiO2). Both are determined using a procedure that simulates the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7667fb8e7cd43ed520dee2904bbbb60
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10
Synthesis, Rietveld refinement and DSC analysis of Al-goethites to support mineralogical quantification of gibbsitic bauxites
Autor: S.P.A. Paz, Rômulo Simões Angélica, P. W. T. S. Torres, Henrique Kahn
Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
This study describes a procedure to synthesize and characterize a series of Al-goethites (varieties with Al-for-Fe substitution ranging from 9 to 28%) to serve as heat-of-reaction (dehydroxylation) standards aiming the quantification of Al-goethite i
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::063c60ff5d581d28ed685019a58565b6
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Plný text Recenzováno Digitální knihovna AV ČR
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