Characterization of Water/Ethanol/Bentonite Dispersions

Bobadilla, Margarita; Carvalho, Thamyres Cardoso de; Munhoz, Antônio Hortêncio; Silva‐Valenzuela, Maria das Graças da; Valenzuela‐Díaz, Francisco Rolando

doi:10.1007/978-3-030-05749-7_42

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…Thus, there is lower viscosity and higher shear stress at higher shear rates. In pure ethanol, the bulk solution is essentially the same viscosity and the aggregation of LPB-Li-Mt is caused by the dominance of ethanol near the Mt layers …”

Section: Resultsmentioning

confidence: 99%

“…In pure ethanol, the bulk solution is essentially the same viscosity and the aggregation of LPB-Li-Mt is caused by the dominance of ethanol near the Mt layers. 43 The zeta potential was calculated to test the dispersion stability of colloidal systems. The addition of ethanol reduced the dielectric constant of the continuous phase and also its polarity.…”

Section: Synthesis Of Li-mt and Lpb-li-mtmentioning

confidence: 99%

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Tunable Colloidal Properties of Lauramidopropyl Betaine and Li Co-modified Montmorillonite in Ethanol/Water

Liu,

Gates,

Yang

et al. 2024

Langmuir

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Montmorillonite (Mt) is a hydrophilic clay mineral with a generally high cationic exchange capacity and a remarkable swellability in water. Yet the application of Mt in cosmetics, paints, polymer nanocomposites, drug delivery systems, and tissue engineering are limited due to its unfavorable swelling and dispersion in alcohol/water mixtures. Improving the swellability and dispersibility of Mt in mixtures of ethanol and water remains challenging. Here, we showed that the swellability and dispersibility of Mt in ethanol/water could be significantly enhanced when lithium-Mt (Li-Mt) was intercalated by zwitterionic surfactant lauramidopropyl betaine (LPB). The binding mechanism of the LPB intercalate to Li-Mt originated from a combination of van der Waals forces, ion-dipole interaction, and electrostatic attraction. Due to the synergistic effect of Li + and LPB, the comodified Mt (LPB-Li-Mt) exhibited excellent swellability, dispersibility, and rheological properties. The structure, morphology, zeta potential, dispersibility, and gel-forming performance of LPB-Li-Mt can be modulated by the concentrations of ethanol in ethanol/water mixtures. When the ethanol concentration increased to 75% v/v ethanol solution, the free swelling of LPB-Li-Mt remained above 80%. The results from X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray photoemission spectrometry, and small-angle X-ray scattering confirmed the full exfoliation of LPB-Li-Mt at 75% (v/v) ethanol solution. The formation of a stable colloidal LPB-Li-Mt dispersion in a mixture of ethanol/water might be derived from the association between water molecules and the Li + , the hydrophobic interaction, and the iondipole of ethanol with the LPB molecules. The findings provide a guide for improving dispersion and swelling of Mt and modified ones in water-miscible organic solvents.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of Li-mt and Lpb-li-mtmentioning

confidence: 99%

Tunable Colloidal Properties of Lauramidopropyl Betaine and Li Co-modified Montmorillonite in Ethanol/Water

Liu,

Gates,

Yang

et al. 2024

Langmuir

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“…Essentially, some studies (Akindele et al, 2019;Akindele, 2020;Aseye et al, 2020;Dahms et al, 2020;Merga et al, 2020;Oni et al, 2020;Redondohasselerharm et al, 2020;Sparks, 2020;Apetogbor et al, 2023;Saad et al, 2022) have used a different amount of potassium hydroxide (KOH) such as 20 ml, 50 ml and 10M of 10% KOH in this digestion process. A few studies have also relied on 30% (v/v) (Oni et al, 2020;Bobadilla et al, 2019;Kelleher et al, 2023;Saad et al, 2022) and 34.5-36.5 (v/v) of hydrogen peroxide (H 2 O 2 ) to dissolve organic substances (Akindele et al, 2019;Akindele, 2020;Akindele and Alimba, 2021). In addition to hydrogen peroxide (H 2 O 2 ), Kelleher et al (2023) used ZnCl 2 and Fenton reagent to dissolve organic matter.…”

Section: Mps Sampling Extraction and Identification Methodsmentioning

confidence: 99%

Microplastic pollution in Africa: an overview of abundance in aquatic organisms, freshwater and marine water environments and analytical methods for reporting

Asori,

Dogbey,

Ampofo

et al. 2023

MEQ

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PurposeCurrent evidence indicates that humans and animals are at increased risk of multiple health challenges due to microplastic (MP) profusion. However, mitigation is constrained by inadequate scientific data, further aggravated by the lack of evidence in many African countries. This review therefore synthesized evidence on the current extent of MP pollution in Africa and the analytical techniques for reporting.Design/methodology/approachA literature search was undertaken in research databases. Medical subject headings (MeSH) terms and keywords were used in the literature search. The authors found 38 studies from 10 countries that met the inclusion criteria.FindingsMarine organisms had MPs prevalence ranging from 19% to 100%, whereas sediments and water samples had between 77 and 100%. The most common and dominant polymers included polypropylene and polyethylene.Practical implicationsThis review shows that most studies still use methods that are prone to human errors. Therefore, the concentration of MPs is likely underestimated, even though the authors’ prevalence evaluations show MPs are still largely pervasive across multiple environmental matrices. Also, the study reveals significant spatial disparity in MP research across the African continent, showing the need for further research in other African countries.Originality/valueEven though some reviews have assessed MPs pollution in Africa, they have not evaluated sample prevalence, which is necessary to understand not only concentration but pervasiveness across the continent. Secondly, this study delves deeper into various methods of sampling, extraction and analysis of MPs, as well as limitations and relevant recommendations.

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Characterization of Water/Ethanol/Bentonite Dispersions

Cited by 2 publications

References 3 publications

Tunable Colloidal Properties of Lauramidopropyl Betaine and Li Co-modified Montmorillonite in Ethanol/Water

Tunable Colloidal Properties of Lauramidopropyl Betaine and Li Co-modified Montmorillonite in Ethanol/Water

Microplastic pollution in Africa: an overview of abundance in aquatic organisms, freshwater and marine water environments and analytical methods for reporting

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