New in situ Blends of Polyaniline and Cardanol Bio‐Resins

Souza, Fernando Gomes de; Richa, Priscila; Siervo, Abner de; Oliveira, Geiza E.; Rodrigues, Cezar H. M.; Nele, Márcio; Pinto, José Carlos

doi:10.1002/mame.200800077

Cited by 47 publications

(41 citation statements)

References 37 publications

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“…The N1S spectrum (Figure 3a) can be deconvoluted into five peaks at 398.2, 399.1, 399.6, 400.8, and 401.9 eV, which can be assigned to pyridinic N25, N-Fe compounds16, benzenoid amine (–NH–)26, graphitic N17192527, and oxidized nitrogen compounds28, with compositions of 24.2, 10.7, 5.9, 41.9, and 17.3 at%, respectively. Our catalyst clearly has high graphitic N content (41.9 at% in total doped nitrogen) and high pyridinic N content (24.2 at%).…”

Section: Resultsmentioning

confidence: 99%

High Performance Fe- and N- Doped Carbon Catalyst with Graphene Structure for Oxygen Reduction

Peng

Liao

et al. 2013

Sci Rep

553

349

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Proton exchange membrane fuel cells are promising candidates for a clean and efficient energy conversion in the future, the development of carbon based inexpensive non-precious metal ORR catalyst has becoming one of the most attractive topics in fuel cell field. Herein we report a Fe- and N- doped carbon catalyst Fe-PANI/C-Mela with graphene structure and the surface area up to 702 m2 g−1. In 0.1 M HClO4 electrolyte, the ORR onset potential for the catalyst is high up to 0.98 V, and the half-wave potential is only 60 mV less than that of the Pt/C catalyst (Loadings: 51 μg Pt cm−2). The catalyst shows high stability after 10,000 cyclic voltammetry cycles. A membrane electrode assembly made with the catalyst as a cathode is tested in a H2-air single cell, the maximum power density reached ~0.33 W cm2 at 0.47 V.

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Section: Resultsmentioning

confidence: 99%

High Performance Fe- and N- Doped Carbon Catalyst with Graphene Structure for Oxygen Reduction

Peng

Liao

et al. 2013

Sci Rep

553

349

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“…In addition, doublets placed at 1 733 and 1 459 cm À1 correspond to C¼C aromatic ring stretching. [21] On the other hand, maghemite presents characteristics bands at 969, 624, and 532 cm À1 , related with the iron oxide. [22] The spectra of the biocomposites do not present any significant differences, when compared to the spectrum of the matrix, probably indicating the absence of significant chemical interactions between the matrix and the filler.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the XRD of pure maghemite presents peaks at 2u ¼ 18. [23] The increase of the amount of maghemite in the matrix causes the appearance of the peak related with the (331) plane of the maghemite, which was also used for crystal size calculation in accordance with Scherer's equation, [21] CS ¼ Kl Du cosðuÞ (3) where K is a constant equal to 1, l the wavelength, Du the full width at half maximum (FWHM), and u is the Bragg angle (2u/2). Calculated crystal sizes are shown in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, Figure 7 shows the particle size distributions, as computed with the software GNOM. [21] The radius of gyration was evaluated in real space using the pair distribution function, P(r), with errors estimated through Monte-Carlo simulations. [24] In all cases, obtained correlation coefficients (R 2 ) were higher than 0.9997, indicating the model adequacy to represent the data.…”

Section: Resultsmentioning

confidence: 99%

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A Magnetic Composite for Cleaning of Oil Spills on Water

Souza

Marins

Rodrigues

et al. 2010

Macro Materials & Eng

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The production of magnetic polymer composites for cleaning of oil spills on water is investigated. The polymer matrix consists of a biopolymer material (alkyd resin), which is cured with TDI in the presence of a magnetic powder (maghemite, γ‐Fe2O3), which is incorporated into the final polymer material in situ. Obtained polymer resins were characterized through magnetic force, AFM and WAXS/SAXS, showing that the proposed preparation technique leads to production of magnetic nanocomposites. Additionally, oil removal tests performed with polymer beads showed that the polymer product can be used to remove considerable amounts of oil from the surface of aqueous environments. In the best case, one part of the polymer product could be used to remove more than eight parts of oil from water.magnified image

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“…Porém, a produção de polímeros a partir de recursos renováveis geralmente apresenta custo elevado e baixos rendimentos. Desta forma, a procura por materiais renováveis que possam ser polimerizados e que apresentem alto rendimento deve ser encorajada [2] . As resinas de poliuretano (PU) podem ser derivadas tanto do petróleo quanto de fontes naturais, como os óleos vegetais.…”

Section: Introductionunclassified

Espumados magnetizáveis úteis em processos de recuperação ambiental

2010

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Resumo: A produção de biodiesel foi incentivada pelo desejo de se obter fontes energéticas de origem diferente do petróleo. Este processo, contudo, gera grandes quantidades de glicerina como subproduto. Assim, novas aplicações devem ser encontradas para esta glicerina evitando o colapso da cadeia nacional produtiva de glicerina animal. Uma aplicação mais nobre para esta glicerina, proveniente da indústria de biodiesel, é a produção de resinas alquídicas. Estas resinas podem ser utilizadas como matrizes de compósitos para recuperação de ambientes aquáticos impactados por acidentes de derrames de petróleo. Outra aplicação para estes materiais é na remoção e limpeza de águas produzidas e águas de refinaria, visando a atender a legislação ambiental. Neste trabalho, nanocompósitos espumados magnetizáveis foram preparados pela inserção de nanopartículas magnetizáveis em uma matriz de resina alquídica, obtida a partir da glicerina oriunda do óleo de mamona. Os materiais produzidos foram caracterizados por FTIR-ATR, DRX e SAXS. Além disso, a força magnética destes materiais foi estudada bem como a capacidade de remoção de petróleo derramado sobre água. Os resultados são animadores, pois demonstram a obtenção de um nanocompósito que possui força magnética relativa superior à da maguemita pura. Além disso, este nanocompósito é capaz de remover massas de petróleo cerca de 300% superiores às massas do material usado. Estes materiais, portanto, consistem em uma potencial ferramenta para a recuperação de ambientes aquáticos impactados por acidentes de derramamento de petróleo. Palavras-chave: Poliuretanos, biopolímeros, nanopartículas magnéticas, óleo de mamona. Magnetic Foams Useful in the Environmental Recovery ProcessesAbstract: The biodiesel production was encouraged since the entire world is looking for new energy sources. However, the biodiesel process produces large amounts of glycerin as byproduct. Therefore, innovative uses for this new glycerin source must be sought so as to avoid the collapse of the animal glycerin chain. In this context, the production of resins is interesting due to the likeness between these polymers and the petroleum, with these resins being promising as spill cleanup agents. In the present work, magnetic foams were prepared with insertion of maghemite nanoparticles into in a polymer generated from the glycerin, and were characterized using FTIR-ATR, WAXD and SAXS techniques. In addition, the magnetic force and the oil removal capability of these materials were also studied. The results are encouraging because nanocomposites were obtained which possess magnetic forces larger than for pure maghemite. Furthermore, this nanocomposite is able to remove a petroleum mass around 300% larger than the used mass of the composite, which means that the composite may be important for avoiding environmental disasters owing to the oil spill on the water. Keywords: Polyurethanes, biopolymers, magnetic nanoparticles, castor oil. IntroduçãoAtualmente há uma enorme preocupação mundial quanto ao uso sustentável do...

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New in situ Blends of Polyaniline and Cardanol Bio‐Resins

Cited by 47 publications

References 37 publications

High Performance Fe- and N- Doped Carbon Catalyst with Graphene Structure for Oxygen Reduction

High Performance Fe- and N- Doped Carbon Catalyst with Graphene Structure for Oxygen Reduction

A Magnetic Composite for Cleaning of Oil Spills on Water

Espumados magnetizáveis úteis em processos de recuperação ambiental

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