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Layer-Charge Heterogeneity in Smectites of I-S Phases in Pelitic Sediments from the Molasse Basin, Austria
Alkylammonium Method Austria Charge Heterogeneity Illite-Smectite K-Fixation Molasse Basin
2011/12/8
Abstract: The purpose of this study was to characterize more fully the surface charge characteristics of the end-member smectite in illite-smectite (I-S) mixed-layer phases found previously in pelitic...
Surface Heterogeneity of Trimethylphenylammonium-Smectite as Revealed by Adsorption of Aromatic Hydrocarbons from Water
Adsorption Energy Distribution DR Equation Fractal Dimension Heterogeneity Micropore Size Distribution Organoclay
2011/12/22
Abstract: Adsorption studies of aromatic hydrocarbons of various molecular sizes on organo-clays in aqueous solution were carried out for characterizing the surface heterogeneity of organo-clays. Benz...
Charge Heterogeneity and Nanostructure of 2:1 Layer Silicates by High-Resolution Transmission Electron Microscopy
Charge heterogeneity Clays High-resolution transmission electron microscopy Illite Montmorillonite Nanostructure Smectite Vermiculite
2011/12/30
Several soil and reference smectites and vermiculites and one reference illite were examined by high-resolution transmission electron microscopy (HRTEM) to decipher the nanostructure and layer charge ...
Adsorption of Water Vapor by Soils: Investigations of the Influence of Organic Matter, Iron, and Aluminum on Energetic Heterogeneity of Soil Clays
Soil constituents Surface heterogeneity Water adsorption
2011/12/29
Water vapor adsorption isotherms were measured for samples of loessial soil clays modified by removing organic matter and Fe and Al compounds. The isotherms were analyzed by the exponential adsorption...
Charge Heterogeneity in Smectites
Cation exchange Enthalpy Smectite Surface charge Swelling
2011/11/25
Abstract: The heterogeneity of sites for Ca→K exchange was examined by microcalorimetry in the <0.2-µm fractions of some selected smectites. Six groups of sites, ranging in exothermic exchange e...
Apparent Charge Heterogeneity in Kaolins in Relation to Their 2:1 Phyllosilicate Content
Cation exchange Enthalpy Heat Kaolin Smectite Surface charge
2012/2/6
Measurements of the differential heats of K-Ca exchange are used to show that 6 groups of sites (ranging from −13.8 to −5.1 kJ/eq and with as many as 4 in any one sample) exist in kaolins ...
Layer Charge Heterogeneity in Vermiculites
Alkylammonium Layer charge Vermiculite Weathering
2012/2/7
The broad charge heterogeneity typical of nearly all smectites is not necessarily characteristic of vermiculites. In addition to vermiculites with pronounced heterogeneity, minerals with no or only li...
Determination of Tetrahedral Substitutions and Interlayer Surface Heterogeneity from Vibrational Spectra of Ammonium in Smectites
Ammonium Hofmann-Klemen effect Infrared spectroscopy Smectite Tetrahedral substitution
2012/2/8
Integrated intensities of the fundamental modes of vibrations of ammonium in heat-treated, NH4+-exchanged swelling minerals permits (1) a quantitative determination of the amount of tetrahedral substi...
Heterogeneity of Charge Density Distribution in Montmorillonite as Inferred from Cobalt Adsorption
Heterogeneity Charge Density Distribution Montmorillonite Cobalt Adsorption
2011/11/18
Abstract: A comparison is made of the ion exchange behavior, towards the cobalt ion, of five sodium montmorillonite clays. The selectivity for the bivalent ion at low cobalt loading is correlated with...
Heterogeneity of Montmorillonite Surface and Its Effect on the Nature of Hydroxy-Aluminum Interlayers
Heterogeneity Montmorillonite Surface Nature Hydroxy-Aluminum Interlayers
2012/2/21
A specimen montmorillonite (Arizona bentonite) was treated with hydroxy-aluminum solutions of various basicity. The cation exchange sites of this clay were found not to be homogeneous in their strengt...