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Influence of Water on the Retention of Organic Probes on Clays Studied by IGC
Illite Inverse Gas Chromatography Kaolinite Surface Energetic Heterogeneity Water Adsorption
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2011/12/22
Abstract: Oil recovery is strongly related to the wettability of reservoir rocks that are formed of quartz grains attached by mineral hydroxides and clay minerals. Illites and kaolinites are the most ...
Characterization of Iron-Manganese Concretions in Kentucky Alfisols with Perched Water Tables
Elemental Composition Fractionation Micromorphology Mineralogy
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2011/12/22
Abstract: Iron-manganese concretions are common in upper sola of Alfisols in the Inner Bluegrass Region of Kentucky. Their nature and quantities appear to be related to the fluctuation of seasonal per...
An FTIR Study of Water Sorption on TMA- and TMPA-Montmorillonites
FTIR TMA-montmorillonites TMPA-montmorillonites Water Sorption
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2011/12/1
Abstract: Water inhibits sorption of uncharged organic compounds on montmorillonites saturated with small alkylammonium cations such as tetramethylammonium (TMA) and trimethylphenylammonium (TMPA). As...
FTIR Study of Competitive Water-Arene Sorption on Tetramethylammonium- and Trimethylphenylammonium-Montmorillonites
Alkylammonium Benzene Ethylbenzene Infrared spectroscopy Organoclay Sorption Water
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2011/12/1
Abstract: Montmorillonites saturated with small quaternary alkylammonium ions such as tetramethylammonium (TMA) or trimethylphenylammonium (TMPA) are excellent sorbents for aromatic pollutants. In som...
Swelling Pressure of Montmorillonite Layers versus H-O-H Bending Frequency of the Interlayer Water
Bending Frequency Hydration Infrared Spectroscopy Interlayer Force Interlayer Water Montmorillonite Swelling Pressure
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2011/12/27
The in-depth perturbation of vicinal water by the surfaces of montmorillonite layers was investigated by relating the swelling pressure, Π, of the montmorillonite layers to the H-O-H bending frequency...
Potential-Distance Relationships of Clay-Water Systems Considering the Stern Theory
Cation Size Clay Minerals Diffuse Double Layer Electric Potential Stern Theory
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2011/12/27
Abstract: This paper deals with the use of Stern theory as applied to a clay-water electrolyte system, which is more realistic to understand the force system at micro level than the Gouy-Chapman theor...
Mechanism of Adsorption and Desorption of Water Vapor by Homoionic Montmorillonites: 2. The Li+, Na+, K+, Rb+, and Cs+-Exchanged Forms
Adsorption Desorption Exchangeable cations Immersion microcalorimetry Montmorillonite Relative humidity Surface area XRD
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2011/12/28
Methods previously used to distinguish between water adsorbed on external surfaces and in the interlamellar space of Na-montmorillonite during adsorption and desorption of water vapor have been extend...
Tetramethylphosphonium- and Tetramethylammonium-Smectites as Adsorbents of Aromatic and Chlorinated Hydrocarbons: Effect of Water on Adsorption Efficiency
Adsorbent Adsorption efficiency Langumir isotherms Monolayer volumes Organo-clays Shrinkage of pores Sorption from water Surface area
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2011/12/28
Tetramethylphosphonium-smectite (TMP-clay) and tetramethylammonium-smectite (TMA-clay), were prepared and characterized as adsorbents for a series of aromatic and chlorinated hydrocarbons. The sorptio...
Infrared Spectroscopic Analyses on the Nature of Water in Montmorillonite
Montmorillonite Spectroscopy Water
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2011/12/29
Interlayer cations and moisture content greatly influence the molecular vibrations of H2O in montmorillonite as shown through reflectance spectroscopy in the infrared. The absorptions due to H2O have ...
Effect of 1,4-Dioxane on the Expansion of Montmorillonite Layers in Montmorillonite/Water Systems
1,4-dioxane Layer expansion Montmorillonite Swelling
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2011/12/28
Suspensions were produced by mixing Na-saturated, Upton montmorillonite with aqueous solutions containing different concentrations of 1,4-dioxane. Each suspension was deposited on a porous ceramic fil...
Development of Ammonium-Saponites from Gels with Variable Ammonium Concentration and Water Content at Low Temperatures
Cation exchange capacity Infrared spectroscopy Saponite Synthesis Thermal analysis Transmission electron microscopy X-ray powder diffraction
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2011/12/1
Abstract: Ammonium-saponite is hydrothermally grown at temperatures below 300°C from a gel with an overall composition corresponding to (NH4)0.6Mg3Si3.4Al0.6O10(OH)2. The synthetic saponite and co-exi...
Synthesis and Paragenesis of Na-Beidellite as a Function of Temperature, Water Pressure, and Sodium Activity
Beidellite Electron microprobe Hydrothermal synthesis Kaolinite Paragonite Pyrophyllite Scanning electron microscopy X-ray diffraction
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2011/12/30
In the chemical system Na2O-Al2O3-SiO2-H2O, the stability field of Na-beidellite is presented as a function of pressure, temperature, and Na- and Si-activity. Na0.7-beidellite was hydrothermally synth...
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
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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...
Vibrational Probe Studies of Water Interactions with Montmorillonite
Cation exchange Desorption isotherm FTIR Gravimetric Montmorillonite Physisorption • Water
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2011/12/31
Interaction of water with montmorillonite exchanged with Na+, K+, Co2+, and Cu2+ cations as a function of water content was examined using an FTIR/gravimetric cell designed to collect spectroscopic an...
Structural Water in Volcanic Glass
Glass Heavy-ion Rutherford scattering High-resolution transmission electron microscopy Structural water
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2011/12/1
Abstract: High-resolution transmission electron microscopy has revealed spherical and hemispherical structures on the surface of partly hydrated volcanic and synthetic glasses. These structures contra...