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Characterization of Octahedral Substitutions in Kaolinites Using Near Infrared Spectroscopy
Kaolinites Near Infrared Spectroscopy Octahedral Substitution
2011/12/2
Abstract: Fourier transform infrared (FTIR) spectroscopy investigations in the near infrared (NIR) region of synthetic and natural kaolinites with various octahedral substitutions have been carried ou...
Structural Fe3+ in Natural Kaolinites: New Insights from Electron Paramagnetic Resonance Spectra Fitting at X and Q-Band Frequencies
Dickite Disorder EPR Fe3+ Kaolinite
2011/12/7
Abstract: Structural Fe3+ in kaolinites and dickites covering a broad range of disorder was investigated using electron paramagnetic resonance (EPR) spectroscopy at both the X and Q-band frequencies. ...
New Techniques for Studying the Intercalation of Kaolinites from Georgia with Formamide
Formamide Hydroxyls Infrared Microscopy Intercalation Kaolinite Raman Microprobe X-ray Diffraction
2011/12/7
Abstract: A new technique utilizing Raman microscopy and Fourier transform infrared (FTIR) microscopy is described. This technique uses thin films of oriented clay aggregates on glass slides suitable ...
Dissolution of well and poorly crystallized kaolinites: Al speciation and effects of surface characteristics
crystallized kaolinites surface characteristics dissolution behavio well-crystallized poorly crystallized
2012/3/31
This study compared surface characteristics and dissolution behavior of well-crystallized (KGa-1b)
and poorly crystallized (KGa-2) kaolinite standards. Atomic force microscopy (AFM) revealed that
pa...
Nanomorphology of Kaolinites: Comparative SEM and AFM Studies
Atomic Force Microscopy Kaolinite Morphology Scanning Electron Microscopy
2011/12/8
Abstract: Nanomorphological structure of well-crystallized Georgia and poorly crystallized North Queensland kaolinite particles have been compared using field emission scanning electron microscopy (SE...
Origin of Cretaceous and Oligocene Kaolinites from the Iwaizumi Clay Deposit, Iwate, Northeastern Japan
Climate Cretaceous Hydrogen-isotopes Iwate Japan Kaolinite Oligocene Oxygen-isotopes
2011/12/27
Abstract: Hydrogen- (δD = −106 to −97‰) and oxygen-(δ18O = +14.0 to +16.6‰) isotope compositions of kaolinite from late Cretaceous and Oligocene deposits at Iwaizumi, northeastern Japan, i...
Hydrothermal Synthesis (250°C) of Copper-Substituted Kaolinites
Cu2+ Kaolinite Octahedral substitution Synthesis
2011/12/28
To obtain Cu-kaolinites with a controlled range of chemical compositions, syntheses were performed by hydrothermally ageing gels with kaolinite stoichiometric compositions. Gels were prepared with sod...
Nature of Structural Disorder in Natural Kaolinites: A New Model Based on Computer Simulation of Powder Diffraction Data and Electrostatic Energy Calculation
Energy calculation Kaolinite Layer disorder XRPD simulation
2011/12/28
A new model for the description of the structural disorder in natural kaolinite materials is proposed, based on the stacking of two 1:1 layers and their enantiomorphs, and encompassing previously prop...
Nature and Stability of Radiation-Induced Defects in Natural Kaolinites: New Results and a Reappraisal of Published Works
EPR Kaolinite Radiation induced defects RID
2011/12/29
A new appraisal of radiation-induced defects (RID) in natural kaolinite, i.e., positive trapped holes on oxygen atoms, has been undertaken using Q-band EPR spectra, recorded at 93 K, of irradiated ann...
FTIR Reflectance vs. EPR Studies of Structural Iron in Kaolinites
EPR Fe Kaolinite Mid and near infrared Substitution
2011/12/29
The substitution of Fe3+ in the kaolinite structure is studied by EPR spectrometry and by FTIR spectrometry on a large set of kaolins from different origins (sedimentary and primary ores, soil kaolins...
Relation between Structural Disorder and Other Characteristics of Kaolinites and Dickites
Crystallinity Dickite Disorder Electron paramagnetic resonance Fourier-transform infrared spectroscopy Kaolinite
2012/1/11
A suite of Georgia kaolinites, ranging from well-ordered to very poorly ordered samples, were studied to explore correlations between degree of structural disorder, geological environment, Fe3+ conten...
Dehydration of Synthetic Hydrated Kaolinites: A Model for the Dehydration of Halloysite(10A)
Dehydration Halloysite Hydrite Kaolinite Water
2012/2/2
Several hydrates can be synthesized from well-crystallized kaolinites; of importance to the present work are a 10-Å hydrate (called the QS-10 hydrate), an 8.6-Å hydrate, and two kinds of p...
Static and Dynamic Structure of Water in Hydrated Kaolinites. I. The Static Structure
Dimethylsulfoxide Halloysite Hydroxyl Infrared spectroscopy Kaolinite Water
2012/2/6
Four hydrates with d(001) = 8.4, 8.6, and 10 侌 (two types) were synthesized by intercalating kaolinite with dimethylsulfoxide and treating the intercalated clay with fluoride ions. X-ray powder diffra...
Effects of Micro-Sized Mixtures of Kaolin Minerals on Properties of Kaolinites
Crystallinity Halloysite Kaolin Kaolinite
2012/2/10
“Kaolinites” from classic, large deposits of kaolin are shown commonly in scanning electron micrographs to be mixtures, at least in part, in microdimensions, of kaolin-mineral polymorphs.Artificial mi...
Determination of Structural Defects in Phyllosilicates by X-Ray Powder Diffraction—II. Nature and Proportion of Defects in Natural Kaolinites
Structural Defects Phyllosilicates X-Ray Powder Diffraction Natural Kaolinites
2012/2/13
Until now, the different attempts to describe the defects of kaolinites were based on the ideas that (i) the hkl reflections with k = 3n are Bragg reflections, while (ii) the hkl reflections with k ≠ ...