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| Registros recuperados : 13 | |
| 5. |  | JAYME-OLIVEIRA, A.; RIBEIRO JUNIOR, W. Q.; RAMOS, M. L. G.; ZIVIANI, A. C.; JAKELAITIS, A. Amaranth, quinoa, and millet growth and development under different water regimes in the Brazilian Cerrado. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 52, n. 8, p. 561-571, fev. 2017. Título em português: Crescimento e desenvolvimento de amaranto, quinoa e milheto sob diferentes regimes hídricos no Cerrado.| Biblioteca(s): Embrapa Cerrados; Embrapa Unidades Centrais. |
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| 6. | | ZIVIANI, A. C.; SANDRI, G. F.; RIBEIRO JUNIOR, W. Q.; RAMOS, M. L. G.; SOUSA, J. Z.; DINIZ NETO, A. C. Efeito de redutor de crescimento (Trinexapac Ethil) no auxílio à seleção de genótipos de trigo Triticum aestivum, para tolerância à seca. In: CONGRESSO BRASILEIRO DE MELHORAMENTO DE PLANTAS, 6., 2011, Búzios. Panorama atual e perspectivas do melhoramento de plantas no Brasil. [Búzios]: SBMP, 2011. 4 P. 1 CD-ROM 4343.pdf| Biblioteca(s): Embrapa Trigo. |
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| 7. | | ZIVIANI, A. C.; RIBEIRO JUNIOR, W. Q.; RAMOS, M. L. G.; BARBOSA, M. A. A. de F.; CORDEIRO, A.; FRANÇA, L. V. Arranjos espaciais de feijoeiro de portes contrastantes e seus efeitos na produtividade e cobertura vegetativa. Bioscience Journal, Uberlândia, v. 25, n. 2, p. 1-9, mar./apr. 2009.| Biblioteca(s): Embrapa Trigo. |
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| 8. | | ZIVIANI, A. C.; RIBEIRO JUNIOR, W. Q.; RAMOS, M. L. G.; BARBOSA, M. A. A. de F.; CORDEIRO, A.; FRANÇA, L. V. Arranjos espaciais de feijoeiro de portes contrastantes e seus efeitos na produtividade e cobertura vegetativa. Bioscience Journal, v. 25, n. 2, p. 1-9, mar./apr. 2009.| Biblioteca(s): Embrapa Cerrados. |
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| 9. | | RIBEIRO JÚNIOR, W. Q.; CORDEIRO, A.; OLIVEIRA, S. A. de; AMABILE, R. F.; COSER, T. R.; RAMOS, M. L. G.; ZIVIANI, A. C. Desenvolvimento da cultivar BRS 195 sob plantio direto na região do Cerrado. In: CONGRESSO BRASILEIRO DE MELHORAMENTO DE PLANTAS, 3., 2005, Gramado. Anais... Passo Fundo: Embrapa Trigo; Sociedade Brasileira de Melhoramento de Plantas, 2005. 1 CD-ROM.| Biblioteca(s): Embrapa Cerrados. |
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| 11. | | MORAES, A. F. de; RIBEIRO JUNIOR, W. Q.; RAMOS, M. L. G.; ZIVIANI, A. C.; GUERRA, A. F.; ROCHA, O. C.; AMABILE, R. F.; MALAQUIAS, J. V. Fenotipagem do trigo para tolerância à seca para o Brasil Central (2009). Planaltina, DF: Embrapa Cerrados, 2009. 1 folder.| Biblioteca(s): Embrapa Cerrados. |
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| 12. | | MORAES, A. F. de; RIBEIRO JUNIOR, W. Q.; RAMOS, M. L. G.; ZIVIANI, A. C.; GUERRA, A. F.; ROCHA, O. C.; AMABILE, R. F.; MALAQUIAS, J. V. Fenotipagem do trigo para tolerância à seca para o Brasil Central. In: ENCONTRO DE JOVENS TALENTOS DA EMBRAPA CERRADOS, 4., 2009, Planaltina, DF. Resumos apresentados... Planaltina, DF: Embrapa Cerrados, 2009. p. 41-42 (Embrapa Cerrados. Documentos, 243).| Biblioteca(s): Embrapa Cerrados. |
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| 13. | | CORDEIRO, A.; FONSECA, K. G. da; VAZ, C. de F, ZIVIANI, A. C.; RIBEIRO JUNIOR, W. Q.; FRANCA, L. V. de; AMABILE, R. F.; ANDRADE, J. M. V.; ALBRECHT, J. C.; RAMOS, M. L. G.; SILVA, M. S. e; GOMES, A. C. Efeito de doses de nitrogenio e redutor de crescimento, na produtividade e acamamento do trigo irrigado no Brasil Central. In: REUNIAO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRICAO DE PLANTAS, 26.; REUNIAO BRASILEIRA SOBRE MICORRIZAS, 10.; SIMPOSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 8.; REUNIAO BRASILEIRA DE BIOLOGIA DO SOLO, 5., 2004, Lages, SC. FertBio 2004: avaliacao das conquistas: bases para estrategias futuras. Lages: [s. n.], 2004. nao paginado.| Biblioteca(s): Embrapa Cerrados. |
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| Registros recuperados : 13 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
28/11/2022 |
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Data da última atualização: |
22/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
OLIVEIRA, L. R. de; GONÇALVES, D. S.; CAROLINO, A. S.; FACCINATTO, W. M.; MENEZES. D. C.; DIAS, C. O.; COLNAGO, L. A.; RUIZ, Y. L.; IU, S. T.; FONSECA FILHO, H. D.; CHAUDHURI, P.; CAMPELO, P. H.; MASCARENHAS, I. P.; SANCHES, E. A. |
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Afiliação: |
LUIZ ALBERTO COLNAGO, CNPDIA. |
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Título: |
Head-to-tail and head-to-head molecular chains of poly(p-anisidine): Combined experimental and theoretical evaluation. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Molecules, v. 27, a6326, 2022. |
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Páginas: |
28 p. |
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DOI: |
https://doi.org/10.3390/molecules27196326 |
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Idioma: |
Inglês |
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Conteúdo: |
: Poly(p-anisidine) (PPA) is a polyaniline derivative presenting a methoxy (?OCH3) group at the para position of the phenyl ring. Considering the important role of conjugated polymers in novel technological applications, a systematic, combined experimental and theoretical investigation was performed to obtain more insight into the crystallization process of PPA. Conventional oxidative polymerization of p-anisidine monomer was based on a central composite rotational design (CCRD).The effects of the concentration of the monomer, ammonium persulfate (APS), and HCl on the percentage of crystallinity were considered. Several experimental techniques such as X-ray Diffraction(XRD), Scanning Electron Microscopy (SEM), multifractal analysis, Nuclear Magnetic Resonance(13C NMR), Fourier-transform Infrared spectroscopy (FTIR), and complex impedance spectroscopyanalysis, in addition to Density Functional Theory (DFT), were employed to perform a systematic investigation of PPA. The experimental treatments resulted in different crystal structures with a percentage of crystallinity ranging from (29.2 ± 0.6)% (PPA1HT) to (55.1 ± 0.2)% (PPA16HT-HH). A broad halo in the PPA16HT-HH pattern from 2θ = 10.0?30.0◦suggested a reduced crystallinity. Needle and globular-particle morphologies were observed in both samples; the needle morphology might have been related to the crystalline contribution. A multifractal analysis showed that the PPA surface became more complex when the crystallinity was reduced. The proposed molecular structures of PPA were supported by the high-resolution 13C NMR results, allowing us to access the percentage of head-to-tail (HT) and head-to-head (HH) molecular structures. When comparing the calculated and experimental FTIR spectra, the most pronounced changes were observed in ν(C?H), ν(N?H), ν(C?O), and ν(C?N?C) due to the influence of counterions on the polymer backbone as well as the different mechanisms of polymerization. Finally, a significant difference in the electrical conductivitywas observed in the range of 1.00 × 10−9 S.cm−1 and 3.90 × 10−14 S.cm−1, respectively, for PPA1HT and PPA16HT-HH. Menos: Poly(p-anisidine) (PPA) is a polyaniline derivative presenting a methoxy (?OCH3) group at the para position of the phenyl ring. Considering the important role of conjugated polymers in novel technological applications, a systematic, combined experimental and theoretical investigation was performed to obtain more insight into the crystallization process of PPA. Conventional oxidative polymerization of p-anisidine monomer was based on a central composite rotational design (CCRD).The effects of the concentration of the monomer, ammonium persulfate (APS), and HCl on the percentage of crystallinity were considered. Several experimental techniques such as X-ray Diffraction(XRD), Scanning Electron Microscopy (SEM), multifractal analysis, Nuclear Magnetic Resonance(13C NMR), Fourier-transform Infrared spectroscopy (FTIR), and complex impedance spectroscopyanalysis, in addition to Density Functional Theory (DFT), were employed to perform a systematic investigation of PPA. The experimental treatments resulted in different crystal structures with a percentage of crystallinity ranging from (29.2 ± 0.6)% (PPA1HT) to (55.1 ± 0.2)% (PPA16HT-HH). A broad halo in the PPA16HT-HH pattern from 2θ = 10.0?30.0◦suggested a reduced crystallinity. Needle and globular-particle morphologies were observed in both samples; the needle morphology might have been related to the crystalline contribution. A multifractal analysis showed that the PPA surface became more complex when the crystallin... Mostrar Tudo |
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Palavras-Chave: |
Conjugated polymer; Multifractal analysis; Poly(p-anisidine). |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1148841/1/P-Head-to-Tail-and-Head-to-Head-Molecular-Chains-of.pdf
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Marc: |
LEADER 03197naa a2200337 a 4500
001 2148841
005 2024-01-22
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.3390/molecules27196326$2DOI
100 1 $aOLIVEIRA, L. R. de
245 $aHead-to-tail and head-to-head molecular chains of poly(p-anisidine)$bCombined experimental and theoretical evaluation.$h[electronic resource]
260 $c2022
300 $a28 p.
520 $a: Poly(p-anisidine) (PPA) is a polyaniline derivative presenting a methoxy (?OCH3) group at the para position of the phenyl ring. Considering the important role of conjugated polymers in novel technological applications, a systematic, combined experimental and theoretical investigation was performed to obtain more insight into the crystallization process of PPA. Conventional oxidative polymerization of p-anisidine monomer was based on a central composite rotational design (CCRD).The effects of the concentration of the monomer, ammonium persulfate (APS), and HCl on the percentage of crystallinity were considered. Several experimental techniques such as X-ray Diffraction(XRD), Scanning Electron Microscopy (SEM), multifractal analysis, Nuclear Magnetic Resonance(13C NMR), Fourier-transform Infrared spectroscopy (FTIR), and complex impedance spectroscopyanalysis, in addition to Density Functional Theory (DFT), were employed to perform a systematic investigation of PPA. The experimental treatments resulted in different crystal structures with a percentage of crystallinity ranging from (29.2 ± 0.6)% (PPA1HT) to (55.1 ± 0.2)% (PPA16HT-HH). A broad halo in the PPA16HT-HH pattern from 2θ = 10.0?30.0◦suggested a reduced crystallinity. Needle and globular-particle morphologies were observed in both samples; the needle morphology might have been related to the crystalline contribution. A multifractal analysis showed that the PPA surface became more complex when the crystallinity was reduced. The proposed molecular structures of PPA were supported by the high-resolution 13C NMR results, allowing us to access the percentage of head-to-tail (HT) and head-to-head (HH) molecular structures. When comparing the calculated and experimental FTIR spectra, the most pronounced changes were observed in ν(C?H), ν(N?H), ν(C?O), and ν(C?N?C) due to the influence of counterions on the polymer backbone as well as the different mechanisms of polymerization. Finally, a significant difference in the electrical conductivitywas observed in the range of 1.00 × 10−9 S.cm−1 and 3.90 × 10−14 S.cm−1, respectively, for PPA1HT and PPA16HT-HH.
653 $aConjugated polymer
653 $aMultifractal analysis
653 $aPoly(p-anisidine)
700 1 $aGONÇALVES, D. S.
700 1 $aCAROLINO, A. S.
700 1 $aFACCINATTO, W. M.
700 1 $aMENEZES. D. C.
700 1 $aDIAS, C. O.
700 1 $aCOLNAGO, L. A.
700 1 $aRUIZ, Y. L.
700 1 $aIU, S. T.
700 1 $aFONSECA FILHO, H. D.
700 1 $aCHAUDHURI, P.
700 1 $aCAMPELO, P. H.
700 1 $aMASCARENHAS, I. P.
700 1 $aSANCHES, E. A.
773 $tMolecules$gv. 27, a6326, 2022.
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