Characterization of Sodium Bentonites: Effect of Treatment with Ammonium Salt-Free Organic Surfactant

Morita, Reinaldo Yoshio; Barbosa, Roseane Moreira Sampaio; Kloss, Juliana Regina

doi:10.5935/1984-6835.20150071

Cited by 8 publications

(10 citation statements)

References 16 publications

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“…Both organoclays and sodium bentonite Vulgel CN 45 had their physical and chemical properties characterized and disclosed in previous work [27] . In that work, the authors reported that the BN-AM showed the lower iron content and it was considered, among the other studied organoclays, the more promising one for nanocomposite use in nanocomposite preparation.…”

Section: Methodsmentioning

confidence: 84%

“…The novelty of the present work is the addition of a new organoclay synthetized with a non-ionic surfactant, free of ammonium salt, which makes it more environmentally friendly [27][28][29] . BN-AM was added to an EVA matrix and the system characterized by WAXD, rheological and thermal analyzes and the results obtained were compared to similar systems containing a traditional organoclay.…”

Section: Introductionmentioning

confidence: 99%

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Rheological and thermal properties of EVA-organoclay systems using an environmentally friendly clay modifiera

et al. 2020

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EVA systems, using an environmentally friendly organoclay modified with a non-ionic and free of ammonium ions modifier (BN-AM), were prepared in a single-screw laboratory extruder and characterized by rheological, morphological and thermal properties. WAXD analysis suggested that the nanocomposites with 1.5 wt% of BN-AM presented an exfoliated structure, while the rheological results showed that the nanocomposites with BN-AM organoclay tended to present a more pronounced shear thinning behavior when compared to EVA and the nanocomposites with the traditional organoclay. The SEM/EDS analysis by using elemental mappings showed good dispersion of the organoclays (BN-AM and BN-CT) in the EVA matrix. Thermogravimetry analysis showed an improvement in thermal stability of EVA when the non-ionic modifier was used instead of the traditional one. In general, it was concluded that the addition of low content of BN-AM organoclay in EVA matrices is a promising option for the production of nanocomposites.

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Section: Methodsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Rheological and thermal properties of EVA-organoclay systems using an environmentally friendly clay modifiera

et al. 2020

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“…The montmorillonite clays were donated by Mineral Technology Centre (CETEM), Federal University of Rio de Janeiro, Cidade Universitária, Rio de Janeiro/RJ, Brazil. The clays were collected in Boa Vista, Paraíba, Brazil, from different sites named “bofe” and “chocolate.” Both were physically and chemically treated at CETEM/UFRJ in order to promote cation exchange of the exfoliated clay lamellae with cationic surfactants, so the clays present a hydrophobic character …”

Section: Methodsmentioning

confidence: 99%

Poly(lactic acid) biocomposites with mango waste and organo‐montmorillonite for packaging

Lima

Minguita

et al. 2019

J of Applied Polymer Sci

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Poly(lactic acid) (PLA) is a biodegradable polymer used in packaging, but its properties can be improved by manufacturing composite matrixes. The combination of PLA, starch, and nano‐montmorillonite leads to materials with superior mechanical properties. Mango lump is rich in cellulose and starch. The goal of this study is to develop and characterize biocomposites based on PLA, mango waste, and nano‐organo‐montmorillonite for packaging. The samples were microstructurally, morphologically, and mechanically characterized. Physical interaction between the phases was observed. The mango components displaced the PLA X‐ray diffraction peaks and the clays altered their intensity, by interfering with chain packing. The addition of single components to PLA increased the samples’ transition temperatures, but the addition of multiple components diminished them. PLA showed adhesiveness to cellulose fibers and nonadhesiveness to starch granules. Thicker samples presented better mechanical properties. PLA–mango–“chocolate clay” samples are relatively stable materials, while PLA–mango–“bofe clay” samples could represent promising highly biodegradable materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47512.

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“…7,e789974669, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i7.4669 The XRD shows peaks at 20°, 34°, 54°, 62°, 73° and 75°, characteristic of Montmorillonite in the sodium and calcium forms, with a predominance of calcium in the presence of peaks 34°, 62°, 73° and 75°. The peaks between 20° and 30° are quartz and kaolinite residues [Morita et al, 2015;Paiva et al, 2008].…”

Section: Partmentioning

confidence: 99%

Rheological assessment of the interaction between hydrophobic nanoclay and xanthan gum in saline environment, for application in drilling nanofluid

Souza

Soares

Rigoli

et al. 2020

RSD

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In the last decade, exploration in high temperature and pressure wells has motivated the improvement of drilling fluids with the application of nanoparticles. In this context, nanoclay, the most available of nanoparticles, has been applied in the development of nanofluids, mainly associated with polymers. In parallel, among the polymers used, xanthan gum has been little explored for this purpose. In this work, the interaction between xanthan gum, hydrophobic nanoclay, sodium and calcium chloride and their influence on the rheological parameters of the mixture was evaluated in solution. The influence of temperature and hydration time on the rheological parameters of the mixture was also evaluated. For this purpose, nanoclay was first characterized with XRF, XRD and TGA. Then, a complete factorial design 24 was adopted, varying the concentrations of nanoclay, xanthan, sodium and calcium chlorides. Third, a Doehlert Matrix of the 7x5x3 type was adopted, varying the concentrations of nanoclay, xanthan and temperature, with the concentrations of the constant salts. In the fourth, select the effect of the hydration time on the color rheological parameters. Finally, Conductivity and Potential Zetas of sizes were verified, varying the concentration of the components and the hydration time of the mixtures. It was concluded that the interactions between the components of the mixture do not stabilize; the temperature, the salts have no significant influence on the rheology of the mixture; nanoclay in concentrations not exceeding 5% (m/v) interacts with the Minimum Shear Stress; the rheological parameters stabilize after 96h of hydration.

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Characterization of Sodium Bentonites: Effect of Treatment with Ammonium Salt-Free Organic Surfactant

Cited by 8 publications

References 16 publications

Rheological and thermal properties of EVA-organoclay systems using an environmentally friendly clay modifiera

Rheological and thermal properties of EVA-organoclay systems using an environmentally friendly clay modifiera

Poly(lactic acid) biocomposites with mango waste and organo‐montmorillonite for packaging

Rheological assessment of the interaction between hydrophobic nanoclay and xanthan gum in saline environment, for application in drilling nanofluid

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