CELANI, M. A.; FREIRE, M. M.; RAMOS, R. C. G. (Org.). A abordagem instrumental no Brasil: um projeto, seus percursos e seus desdobramentos. Campinas: Mercado de Letras, 2009.

Silva, Kléber Aparecido da

doi:10.1590/s1984-63982011000400010

Cited by 4 publications

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“…Post-treatment through organic reactions can be a quite interesting approach because they permit the use of soft treatment conditions that may preserve the structural characteristics of the carbon materials, and provide different reaction pathways for finely tuning the surface chemistry with a wide variety of surface groups [12][13][14][15][16][17][18][19]. Nitrogen functionalization is usually achieved through the oxidation of the carbon material with HNO 3 in order to generate carboxylic acids on its surface, which acts as the anchorage points for the subsequent reactions [6,18].…”

Section: Introductionmentioning

confidence: 99%

Generation of nitrogen functionalities on activated carbons by amidation reactions and Hofmann rearrangement: Chemical and electrochemical characterization

Mostazo‐López

Ruiz-Rosas

Morallón

et al. 2015

Carbon

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Please cite this article as: Mostazo-López, M.J., Ruiz-Rosas, R., Morallón, E., Cazorla-Amorós, D., Generation of nitrogen functionalities on activated carbons by amidation reactions and Hofmann rearrangement: chemical and electrochemical characterization, Carbon (2015), doi: http://dx. AbstractNitrogen functionalization of a highly microporous activated carbon (BET surface area higher than 3000 m 2 /g) has been achieved using the following sequence of treatments: (i) chemical oxidation using concentrated nitric acid, (ii) amidation by acyl chloride substitution with NH 4 NO 3 and (iii) amination by Hoffman rearrangement. This reaction pathway yielded amide and amine functional groups, and a total nitrogen content higher than 3 at%. It is achieved producing only a small decrease (20%) of the starting microporosity, being most of it related to the initial wet oxidation of the activated carbon. Remarkably, nitrogen aromatic rings were also formed as a consequence of secondary cyclation reactions. The controlled step-by-step modification of the surface chemistry allowed to assess the influence of individual nitrogen surface groups in the electrochemical performance in 1M H 2 SO 4 of the carbon materials. The largest gravimetric capacitance was registered for the pristine activated carbon due to its largest apparent surface area. The nitrogen-containing activated carbons showed the highest surface capacitances. Interestingly, the amidated activated carbon showed the superior capacitance retention due to the presence of functional groups (such as lactams, imides and pyrroles) that enhance electrical conductivity through their electron-donating properties, showing a capacitance of 83 F/g at 50 A/g. 399.8 ± 0.2 Amide, Lactam, Amine, Imide 1.89 50 398.8 ± 0.2 Pyridine, Imine 1.17 31 KUA-NH 2 400.5 ± 0.2 Pyrrole, Pyridone 0.72 27 399.6 ± 0.2 Amide, Lactam, Amine, Imide 1.25 48 398.5 ± 0.2 Pyridine, Imine 0.65 25 KUA-CONH 2 after TPD 398.4 ± 0.2 Pyridine 0.55 49 400.6 ± 0.2 Pyrrole, Pyridone 0.57 51 KUA-NH 2 after TPD 398.3 ± 0.2 Pyridine 0.42 31 400.2 ± 0.2 Pyrrole, Pyridone 0.92 69

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Section: Introductionmentioning

confidence: 99%

Generation of nitrogen functionalities on activated carbons by amidation reactions and Hofmann rearrangement: Chemical and electrochemical characterization

Mostazo‐López

Ruiz-Rosas

Morallón

et al. 2015

Carbon

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“…However, environ mental concerns about the use of preservatives have been raised due to the dispersion of copper and arsenic into the environment before the complete fixation of the active ingredients with the possibility of contamination of soil and groundwater [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Paricá Wood Species Treated with CCB Preservative

H.¹,

S.²,

D.³

et al. 2013

cmaterials

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Wood of Paricá species (Schizolobium amazonicum) is highly susceptible to degradation by decay microorganis ms. Due to its increasing production in the northern region of Brazil, about 85 thousand hectares, and later use both for structural purposes and for the furniture industry, the need of extending life of Paricá wood applying chemical preservatives arises. One current alternative is the treatment by autoclave using CCB (Copper Chro me Boron). The aim of this study was to evaluate the influence of treatment with CCB in the properties: apparent density, parallel and perpendicular hardness to the grain, strength to shear and in the co mpression parallel to the grain of the Schizolobium amazonicum wood species, comparing the results with untreated wood. We observed that treatment with CCB did not change the properties of apparent density, shear strength, perpendicular hardness, strength and stiffness in co mpression parallel to the grain. For the hardness strength parallel to the grain was decreased in 28.9%.

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italiano jurídico no Brasil: uma pesquisa

Casini

Mastelaro

2016

Rev. Ital. (Online)

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quézea regIna alBOlea mastelarO RESUMO: O presente artigo é um recorte de uma pesquisa realizada acerca do ensino do italiano jurídico no Brasil, que partiu de uma análise dos manuais didáticos de italiano para juristas e das propostas de cursos realizadas com alunos lusófonos que atuam na área jurídica. Iniciamos discorrendo brevemente sobre o surgimento, na Itália, do uso do "vulgar" em documentos jurídicos e do desenvolvimento da língua através do tempo, até assinalar a importância da língua italiana para quem estuda Direito no Brasil. A partir da análise dos livros didáticos especializados, realizamos um curso para o perfil de alunos indicado nesses manuais (nível intermediário), com o intuito de investigar na prática facilidades e dificuldades dos estudantes ao usá-los. Partindo dos resultados desse primeiro curso, projetamos um novo curso para iniciantes absolutos no idioma, trabalhando as quatro habilidades (ouvir, entender, ler e escrever) de forma integrada, com base nos estudos de Balboni (2010), em que os alunos estudaram tanto a língua comum como a língua de especialidade. Para a realização desta pesquisa, partimos dos trabalhos pioneiros realizados por Candido et al. (1977) Balboni (2010). Per la ricerca ci siamo basati sul lavoro pionieristico svolto da Candido et al. (1977), e su quelli di Celani et al. (2009) e Mordente e Ferroni (2011a2011b (listening, understanding, reading and writing), according to the studies by Balboni (2010), in which the students studied both the common language and the specific language of Law. We based the research on the pioneering work done by Candido et al. (1977), as well as the ones by Celani et al. (2009) and Mordente e Ferroni (2011a;2011b); and we brought our observations, hoping to expand the research in the field of Italian with specific purposes.

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CELANI, M. A.; FREIRE, M. M.; RAMOS, R. C. G. (Org.). A abordagem instrumental no Brasil: um projeto, seus percursos e seus desdobramentos. Campinas: Mercado de Letras, 2009.

Cited by 4 publications

References 0 publications

Generation of nitrogen functionalities on activated carbons by amidation reactions and Hofmann rearrangement: Chemical and electrochemical characterization

Generation of nitrogen functionalities on activated carbons by amidation reactions and Hofmann rearrangement: Chemical and electrochemical characterization

Physical and Mechanical Properties of Paricá Wood Species Treated with CCB Preservative

italiano jurídico no Brasil: uma pesquisa

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