Journal ArticleDOI
Interpretation of Solid State 13C and 29Si Nuclear Magnetic Resonance Spectra of Kaolinite Intercalates
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TLDR
In this article, the authors used magic-angle spinning bas to study the short-range ordering and bonding in the structures of intercalates of kaolinite with formamide, hydrazine, dimethyl sulfoxide (DMSO), and pyridine-Noxide (PNO).Abstract:
13C and 29Si nuclear magnetic resonance spectroscopy with magic-angle spinning bas been used to study the short-range ordering and bonding in the structures of intercalates of kaolinite with formamide, hydrazine, dimethyl sulfoxide (DMSO), and pyridine-N-oxide (PNO). The 29Si chemical shift indicated decreasing levels of bonding interaction between the silicate layer and the intercalate in the order: kaolinite: formamide (δ) = -91.9, ppm relative to tetramethylsilane), kaolinite: hydrazine (-92.0), kaolinite: DMSO (-93.1). The 29Si signal of the kaolinite:PNO intercalate (-92.1) was unexpectedly deshielded, possibly due to the aromatic nature of PNO. The degree of three-dimensional ordering of the structures was inferred from the 29Si signal width, with the kaolinite: DMSO intercalate displaying the greatest ordering and kaolinite: hydrazine the least. 13C resonances of intercalating organic molecules were shifted downfield by as much as 3 ppm in response to increased hydrogen bonding after intercalation, and in the kaolinite: DMSO intercalate the two methyl-carbon chemical environments were non-equivalent (δ = 43.7 and 42.5).read more
Citations
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Probing the nanoscale architecture of clay minerals
TL;DR: In this article, a review of the nanoscale chemistry of clay minerals at several different length scales is presented, including the length scale associated with H bonding in clay minerals, and the second length scale considered here is associated with clay-water and clay-organic interactions.
Journal ArticleDOI
One-Step Exfoliation of Kaolinites and Their Transformation into Nanoscrolls
TL;DR: Kaolinite nanoscrolls, rolled kaolinite sheets with a tubular form, were prepared by a one-step route in which intercalation of guest species and swelling with solvent proceed at the same time, ascribed to the relatively weak interactions between the head groups ofGuest species and the interlayer surface of methoxy-modified Kaolinite.
Journal ArticleDOI
Crystal Structure of Kaolinite: Dimethylsulfoxide Intercalate
TL;DR: In this article, the crystal structure of the kaolinite : dimethylsulfoxide (DMSO) intercalate (P 1, a = 5.187(2), b = 8.964(3), c = 11.838(4), a = 91.53(1) ~ = 108.59(2) ~ T = 89.92(1)*) was determined using spectroscopic and X-ray and neutron powder diffraction data.
Journal ArticleDOI
Chemically modified kaolinite. Grafting of methoxy groups on the interlamellar aluminol surface of kaolinite
TL;DR: In this paper, a structural model has been proposed, in which every third interlayer surface hydroxy group on the aluminol surface of kaolinite has been replaced by a methoxide group.
Journal ArticleDOI
Reactivity of ionic liquids with kaolinite: melt intersalation of ethyl pyridinium chloride in an urea-kaolinite pre-intercalate.
TL;DR: The results of the XRD, FTIR, and TGA analyses confirmed the intercalation of ethyl pyridinium in the interlamellar spaces of kaolinite.
References
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Calculation of Nuclear Magnetic Resonance Spectra of Aromatic Hydrocarbons
C. E. Johnson,Frank A. Bovey +1 more
TL;DR: In this article, the free electron model of Pauling was used to calculate the magnetic field around a benzene ring which is rotating rapidly about all axes in an external magnetic field.
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Structural studies of silicates by solid-state high-resolution silicon-29 NMR
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Stretching Frequencies as a Function of Distances in Hydrogen Bonds
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Interpretation of Carbon-13 NMR Spectra
TL;DR: In this article, the authors describe the history of Carbon-13 NMR and the Nuclear Overhauser Effect (NOE) and the role of spin-lattice relaxations.