Molecular control of the functional and spatial interlayer environment of kaolinite by the grafting of selected pyridinium ionic liquids

Dedzo, Gustave Kenne; Nguelo, Bruno Boniface; Tonlé, Ignas Kenfack; Ngameni, Emmanuel; Detellier, Christian

doi:10.1016/j.clay.2017.04.019

Cited by 24 publications

(3 citation statements)

References 42 publications

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“…Common approach to induce lattice expansion is extra group introduction (e.g., grafting, insertion) [8][9][10][11] or phase transformation induced by heating. 12 Herein, species were irradiated intermittently and stored in air at room temperature.…”

Section: Lattice Deformation Analysismentioning

confidence: 99%

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Wang,

Sun,

Xia

et al. 2023

J Am Ceram Soc.

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Electronic components made by inorganics (e.g., mica) play key roles in function exertion of instruments working in outer‐layer space, enduring long‐term β ray irradiation. Its damage is vital while explored rarely. Herein, pure muscovite crystals were chosen and irradiated by an electron beam (EB) in air with dose up to 1000 kGy. Then, micro‐geometry morphology variation in Z‐axis and microstructural transformation mechanism were explored by XRD, FT‐ATR IR, TGA, XPS and CA analysis. Main results reveal that muscovite lattice is unstable to EB irradiation. With dose increases to 1000 kGy interlayer space d of (002) lattice varied 2% near 0.2 Å. At low dose irradiation lattice expansion is readily to occur while at higher dose it is lattice shrinkage, showing a transformation from expansion to shrinkage. Concurrently, chemical structure varied, H2O amount increased, metal element valance and surface wettability were reduced. Where, dehydroxylation occurred exceeding H2O radiaolysis and evaporation, and framework cleavage be severe. Binding energies of metals of 1000 kGy‐irradiated species decreased by 0.2 eV, CA of 100 kGy‐irradiated species increased by 10°. Intrinsic mechanisms involve framework destruction, H‐atom migration, hydrogen bond formation/destruction and H2O radiolysis. At low dose irradiation, H‐atom migration and hydrogen bond formation/destruction are predominant, inducing lattice expansion; at higher dose, framework cleavage is intensive and crucial, inducing shrinkage. During which, partial H2O occurred radiolysis, reducing valence. Generally, H‐atom migration and interface cleavage played key roles in microgeometry morphology variation of muscovite crystal under EB irradiation at 0–1000 kGy. To enhance muscovite geometry morphology‐stability under a long‐term β‐ray irradiation condition OH and hydrogen bond contents should be reduced and interface region should be strengthened (e.g., lessening vacancies or compacting stacking). This conclusion promotes design of radiation‐resistant silicate material, guiding manufacture of electronic component used in aerospace industry, significant.This article is protected by copyright. All rights reserved

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Section: Lattice Deformation Analysismentioning

confidence: 99%

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Wang,

Sun,

Xia

et al. 2023

J Am Ceram Soc.

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“…The amount of residual water is mainly attributed to hydrated nitrate anions cointercalated with BEHP and the fraction of nonintercalated LDH still present in the composite as shown in XRD results. The decrease in the dehydroxylation temperature after intercalation is very common in the case of hydroxylated lamellar materials, including aluminosilicates [36,37]. Indeed, the intercalated compound facilitates heat diffusion between the layers, which can lead to a remarkable lowering of the dehydroxylation temperature [38].…”

Section: Structural Characterization By Tgamentioning

confidence: 99%

Sensitive electrochemical detection of methyl parathion in the presence of para-nitrophenol on a glassy carbon electrode modified by a functionalized NiAl-layered double hydroxide

Kameni

Tcheumi

Tonlé

et al. 2018

Comptes Rendus. Chimie

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“…Kaolinite layers are assembled and stacked together by hydrogen bonding (Figure ). The strong cohesion between consecutive layers limited the specific surface area and therefore the reactivity of kaolinite. − Through the intercalation and exfoliation with organic molecules, the nanoclays had enhanced properties, such as dispersity, stability, mechanical property, fire retardancy, and so on. − More importantly, extensive researches showed that kaolinite can be functionalized to meet particular requirements by intercalation with organic molecules. ,,,− But only a few small molecules (DMSO, urea, potassium acetate, N -methylformamide, hydrazine, etc.) can be directly intercalated to form “pre-intercalates”. − …”

Section: Introductionmentioning

confidence: 99%

Integrating Structural and Thermodynamic Mechanisms for Methanol Intercalated Kaolinite Nanoclay: Experiments and Density Functional Theory Simulation

Wang,

Fu,

Yang

2023

Inorg. Chem.

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Methanol intercalated kaolinite (Kaol) plays an important role in the intercalation, exfoliation, and organic modification of kaolinite nanoclay. However, the evolution of the layer structure of Kaol and its thermodynamic stability during the methanol intercalation process have not been clarified at the atomic level. Here, by combination of density functional theory (DFT) calculation and experimental characterizations, the interlayer bonding, structure evolution, and energetics from dimethyl sulfoxide (DMSO) intercalated Kaol to methanol intercalated Kaol were investigated. Partial methanol molecules entered the interlayers of Kaol to form some intermediate structures with the same d-spacing as that of DMSO intercalated Kaol. Different numbers of grafted methoxy and water molecules coexist together in the interlayer to form the final structures of methanol intercalated kaolinite (MeO m /nH 2 O/Kaol). The whole intercalation process is energy-consuming, and the presence of DMSO would affect the intercalation of methanol. Meanwhile, the formation energy from intermediate structures to final structures was found reduced under the participation of water.

show abstract

Molecular control of the functional and spatial interlayer environment of kaolinite by the grafting of selected pyridinium ionic liquids

Cited by 24 publications

References 42 publications

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Sensitive electrochemical detection of methyl parathion in the presence of para-nitrophenol on a glassy carbon electrode modified by a functionalized NiAl-layered double hydroxide

Integrating Structural and Thermodynamic Mechanisms for Methanol Intercalated Kaolinite Nanoclay: Experiments and Density Functional Theory Simulation

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