Intercalation of the Kaolin Minerals with Simple Molecules

Kloprogge, J. Theo

doi:10.1007/978-3-030-02373-7_6

Cited by 2 publications

(2 citation statements)

References 127 publications

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“… 33 The FT-IR spectrum of pure sodium alginate presents asymmetric and symmetric stretching vibrations at 1427 and 1590 cm −1 due to carboxyl anions, and that at 1031 cm −1 corresponds to oxygen stretching in cyclic ether bridge. 34 The FT-IR spectra of the composite gels, with the AC-4 aerogel as an example, demonstrate that their chemical structure is similar to that of sodium alginate. No significant differences in hydroxyl (–OH) stretching bands at approximately 3400 cm −1 , which corresponded to hydroxyl stretching bands in molecular water in Si–OH, are observable.…”

Section: Resultsmentioning

confidence: 89%

Nanoclay-reinforced alginate aerogels: preparation and properties

Xu,

Jin,

et al. 2024

RSC Adv.

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Section: Resultsmentioning

confidence: 89%

Nanoclay-reinforced alginate aerogels: preparation and properties

Xu,

Jin,

et al. 2024

RSC Adv.

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“…Certain molecules such as hydrazine, DMSO, small amides, K-acetate, etc., are known to intercalate spontaneously the interlayer space of kaolinite (a 1:1 dioctahedral clay mineral) shifting its X-ray diffraction (XRD) 001 reflection from ~7.2 to 10-14 Å (Kloprogge, 2019;Lagaly et al, 2006). A common finding in kaolinite intercalation studies is that, regardless of the type of guest molecules, Associate Editor: Jana Madejová there is a population of kaolinite that is resistant to intercalation (Lagaly et al, 2006;Rausell-Colom & Serratosa, 1987).…”

Section: Introductionmentioning

confidence: 99%

On the Unusual Temperature Dependence of Kaolinite Intercalation Capacity for N-methylformamide

Andreou

Siranidi

Derkowski

et al. 2022

Clays and clay miner.

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Many kaolinites are known to exhibit limited intercalation capacity which affects their usage. Some reports have linked this lack of reactivity to particular structural features or to slow kinetics; others recommended increasing intercalation temperature as a remedy. The purpose of the current study was to investigate systematically the N-methylformamide (NMF) intercalation capacity of three kaolinites differing in layer stacking order (KGa-1b, KGa-2, and Imerys Hywite Alum) in the 5–150°C temperature range. Near-infrared spectroscopy (NIR) was employed to record the full kinetics of intercalation in closed systems with excess NMF. Increasing intercalation temperature accelerated the reaction, but the NMF uptake decreased and eventually vanished. Complementary thermogravimetric analysis (TGA) confirmed this unexpected trend. All kaolinites exhibited the same behavior, but the amount of inert material was in the order of their stacking-fault concentration at all temperatures: KGa-2 > Hywite > KGa-1b. Subjecting the samples to stepwise temperature changes showed that, once intercalated, the NMF could not deintercalate and was removed from equilibrium with the surrounding fluid. Thus, intercalation capacity was not a unique feature of the material because it depended on thermal history. As stacking order and thermal history had no detectable effect on the NMF-hosting environment, the unusual temperature dependence was attributed tentatively to the adverse effect of temperature on the adsorption of NMF on the edges of the crystallites, which is a prerequisite for intercalation.

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Intercalation of the Kaolin Minerals with Simple Molecules

Cited by 2 publications

References 127 publications

Nanoclay-reinforced alginate aerogels: preparation and properties

Nanoclay-reinforced alginate aerogels: preparation and properties

On the Unusual Temperature Dependence of Kaolinite Intercalation Capacity for N-methylformamide

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