Purificação e organofilização em escala piloto de argilas bentoníticas com tensoativo não iônico e aplicação em nanocompósitos poliméricos

Cavalcanti, Wilma Sales; Brito, Gustavo de Figueiredo; Agrawal, Pankaj; Mélo, Tomás Jefférson Alves de; Neves, G. A.; Dantas, Mísia Macedo

doi:10.1590/0104-1428.1539

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…Non-clay minerals are regarded as impurities for many applications, such as nanofillers for polymer composites [23,24]. Therefore, a fractionation step was necessary to obtain a clay sample with a higher grade of purity.…”

Section: Resultsmentioning

confidence: 99%

Mineralogical characterization of natural clays from Brazilian Southeast region for industrial applications

2017

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Characterization studies of clays are often performed to identify possible markets for these materials. Bearing this in mind, two samples of natural clays from the Southeast region of Brazil were studied. Conventional techniques of characterization were used. Granulometric analysis and determination of cationic exchange capacity of these clays were also performed. Nitrogen adsorptiondesorption measurements were used to determine the Brunauer-Emmett-Teller specific surface area, and Barrett-Joyner-Halenda and t-plot pore size analysis were carried out. The results obtained were similar for the two clays. Both present high clay fraction (above 80 wt%) composed of illite, kaolinite and quartz minerals. Stratified illite-smectite structures were also observed. Traces of calcite were detected in one of the clay samples, while traces of montmorillonite were observed in the other sample. These results were corroborated by the low cationic exchange capacity values obtained for both clays. These clays showed good adsorptive properties, evidenced by their specific surface areas, with predominantly mesoporous structures and slit-like pores. According to their features, these clays have potential use as adsorbents to replace more expensive materials due to their easy availability and low cost. Keywords: characterization techniques, clay minerals, natural clays. Resumo

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Section: Resultsmentioning

confidence: 99%

Mineralogical characterization of natural clays from Brazilian Southeast region for industrial applications

2017

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“…Argilominerais lamelares "in natura" ou modificados por reações de troca iônica, quando inseridos em matrizes poliméricas, geralmente dão origem a materiais com melhores propriedades ópticas, térmicas, elétricas, mecânicas, etc. [1][2][3][4][5][6] . Na maioria das aplicações citadas acima, a superfície dos sólidos desempenha um papel fundamental, de modo que a reatividade está diretamente relacionada à composição química, morfologia e características superficiais.…”

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Nanocompósitos de poli(álcool vinílico) contendo materiais híbridos mimetizando o pigmento Azul Maya

Kupfer

Jaerger

2015

Polímeros

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ResumoDe forma a mimetizar o pigmento Azul Maya, dois corantes azo (alaranjado de metila -AM e vermelho congo -VC) foram inseridos na estrutura porosa da paligorsquita. Os materiais híbridos foram caracterizados por difração de raios X, espectroscopia de energia dispersiva, microscopia eletrônica de varredura, espectroscopia na região do ultravioleta-visível e análise superficial (área superficial por BET, tamanho e volume de poros por BJH). Após dispersar os materiais híbridos no poli(álcool vinílico), filmes coloridos e transparentes foram obtidos por casting úmido. Após acondicionamento em uma dessecador por uma semana a uma umidade controlada de 43 ± 2% os filmes foram avaliados em relação as suas propriedades mecânicas. De modo geral, o material PVA-PGS/AM teve um aumento no módulo de Young, tensão de ruptura e redução do alongamento enquanto que a paligorsquita bruta e PVA-PGS/VC apresentaram um comportamento oposto. Palavras-chave: corante azo, materiais híbridos, propriedades mecânicas, paligorsquita, poli(álcool vinílico). AbstractTo mimic the Maya Blue pigment, two azo dyes (methylorange -AM and congo red -VC) were inserted into the porous structure of paligorskite. The hybrid materials were characterized by X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy, UV-Vis spectroscopy and surface analysis (surface area by BET, pore size and volume by and BJH). After dispersing the hybrid materials into poly(vinyl alcohol), colored and transparent films were obtained by wet casting. After conditioned into desiccators at controlled humidity of 43 ± 2% for one week, the films were evaluated in relation to their mechanical properties. In general, the material PVA-PGS/AM increases Young's modulus and ultimate tensile strength reducing the elongation while raw paligorskite and PVA-PGS/VC presented an opposite behavior.

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“…Thus, the enhanced crystallinity of CaCO3 is beneficial for improving water resistance and reducing water permeability[39]. Bentonite presented typical diffraction peaks of montmorillonite at 2θ = 35.0°, kaolinite at 20.2° and 25.2°, and quartz with diffraction peaks at 2θ = 22.2, 27.1, 48.5, and 54.4°[40,41]. Titanium was found as titania (TiO2), with peaks at 2θ angles of20.8, 27.5, 36.2, 39.5, 40.3, 44.1, 54.4, 56.7, 63.1, 68.2, and 69.3°[42,43].…”

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Wall Latex Paint with Graphene Oxide Incorporation

Sousa

Sousa²,

Lima

et al. 2022

Coatings

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Graphene has stood out in several areas of research. The objective of the present work was an unprecedented study in the production of a commercial wall latex paint with graphene oxide incorporation. The developed paint was assessed by performance tests according to the Brazilian standards, and the characterization was performed using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR), thermogravimetric analysis (TGA), and contact angle analysis. The results indicated that GO addition led to a better dispersion of the paint compound mixture even at very low concentrations (1% and 2%). For the dry and wet paint coverage performance tests, the results were superior, 2% and 9%, respectively, when compared with the paint without GO addition. All performance tests were in accordance with the requirements of the Brazilian standards. Thus, it was concluded that GO-containing paint could be a promising building material to be used as a paint additive obtaining superior properties.

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Purificação e organofilização em escala piloto de argilas bentoníticas com tensoativo não iônico e aplicação em nanocompósitos poliméricos

Cited by 3 publications

References 24 publications

Mineralogical characterization of natural clays from Brazilian Southeast region for industrial applications

Mineralogical characterization of natural clays from Brazilian Southeast region for industrial applications

Nanocompósitos de poli(álcool vinílico) contendo materiais híbridos mimetizando o pigmento Azul Maya

Wall Latex Paint with Graphene Oxide Incorporation

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