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Relation of Infrared, Crystallochemical, and Morphological Properties of Al-Substituted Hematites
Aluminum Hematite Infrared spectroscopy Iron oxides Morphology Unit-cell parameters
2012/2/6
Synthetic Al-hematites prepared from ferrihydrites, at low (∼ 100°C) and high (400° and 800°C) temperatures were studied for their morphological, crystallochemical, and infrared (IR) characteris...
Effect of Selective Dissolution on Charge and Surface Properties of an Acid Soil Clay
Anion exchange Cation exchange Electrophoresis Inceptisol Soil clay Surface charge Zeta potential
2012/2/6
To evaluate the importance of oxides to the surface chemistry of acid mineral soils, clay fractions were separated from a surface and subsurface horizon of an Inceptisol representative of many of the ...
Cation Distribution, Mossbauer Spectra, and Magnetic Properties of Ferripyrophyllite
Cations Ferripyrophyllite Iron Magnetic properties Mossbauer spectra Pyrophyllite
2012/2/6
A sample of ferripyrophyllite, a mineral with ideal composition Fe2Si4O10(OH)2, was analyzed by Mössbauer spectroscopy, magnetization and magnetic susceptibility measurements. The iron is entirel...
Cross-Linked Smectites. III. Synthesis and Properties of Hydroxy-Aluminum Hectorites and Fluorhectorites
Cross-linking Fluorhectorite Hectorite Hydroxyaluminum Molecular sieve Surface area Synthesis Thermal stability
2012/2/2
Interaction of La3+ and Ce3+-exchanged hectorites with oligomeric hydroxy-Al cations results in the formation of cross-linked hectorites possessing moderately high surface areas (∼220–280 m2/g) ...
Spherical Kaolinite: Synthesis and Mineralogical Properties
Halloysite High resolution electron microscopy Infrared spectroscopy Kaolinite Spherules Synthesis X-ray powder diffraction
2012/2/7
Spherical kaolinite has been synthesized for the first time from noncrystalline aluminosilicate material in hydrothermal experiments conducted between 150° and 250°C and under autogenous vapor pressur...
Physicochemical Properties of Montmorillonite Interlayered with Cationic Oxyaluminum Pillars
Catalysis Interlayering Molecular sieve Montmorillonite Oxyaluminum Pillar
2011/11/23
Abstract: By ion exchanging expandable clay minerals with large, cationic oxyaluminum polymers, 損illars?were introduced that permanently prop open the clay layers. On the basis of thermal, infrared sp...
Anion-Exchange Properties of Hydrotalcite-Like Compounds
Anion exchange Anion selectivity Crystallite size Hydrotalcite Naphthol Yellow S X-ray powder diffraction
2012/2/7
Ion-exchange isotherms between hydrotalcite-like compounds (HT) of the NO3-, Cl-, and SO4- forms and F−, Cl− Br−, I−, OH−, SO42−, CO32−, and Naphthol Yellow S...
Surface Properties of Smectites Exchanged with Mono- and Biprotonated 1,4-Diazobicyclo(2,2,2)-Octane
Dabco Interlayering Pillar Smectite Surface area
2012/2/7
Smectites exchanged to various degrees with mono- or biprotonated 1,4-diazobicyclo(2,2,2)- octane (Dabco) have a porous structure in which the organic molecule acts as a 乬pillar.乭 Less Dabco2+ than Da...
Surface Properties of Sepiolite from Amboseli, Tanzania, and Its Catalytic Activity for Ethanol Decomposition
Adsorption Catalysis Ethanol Pore size Sepiolite Surface area
2012/2/7
The catalytic activity of sepiolite from Amboseli, Tanzania, for the dehydration and dehydrogenation of ethanol at 150°–300°C has been studied using a flow reactor. Both reactions occur, but the catal...
Surface Properties of Allophane, Halloysite, and Imogolite
Adsorption Allophane Halloysite Imogolite Infrared spectroscopy Phosphate Surface charge
2012/2/7
The adsorption of sodium, chloride, and phosphate ions by allophane, imogolite, and halloysite has been studied in relation to the surface structure of the mineral samples. The high adsorption of phos...
SURFACE PROPERTIES OF SEPIOLITE FROM AMBOSELI,TANZANIA, AND ITS CATALYTIC ACTIVITY FOR ETHANOL DECOMPOSITION
Adsorption Catalysis Ethanol Pore size Sepiolite Surface area
2011/11/16
The catalytic activity of sepiolite from Amboseli, Tanzania, for the dehydration and dehydrogenation of ethanol at 150~176 has been studied using a flow reactor. Both reactions occur, but the catalyst...
Adsorption of Uranium from Solutions by Montmorillonite; Compositions and Properties of Uranyl Montmorillonites
Adsorption Cation exchange Interlayer cations Montmorillonite Uranium Uranyl montmorillonite
2011/11/22
Abstract: Wyoming montmorillonite, <2-祄 particle size, saturated with Na, K, Mg, Ca, and Ba ions, was reacted with uranyl nitrate solutions in the concentration range 1?00 ppm uranium. With constant a...
Preparation and Electrical Properties of Quaternary Ammonium Montmorillonite-Polystyrene Complexes
Electrical properties Intercalation Montmorillonite Polystyrene Quaternary ammonium complexes
2012/2/8
Intercalation compounds of styrene and quaternary ammonium montmorillonite were prepared by immersion of the clay in styrene monomer. The intercalation of stearyltrimethylammonium (CH3(CH2)17N(CH3)3+)...
Properties of Silica-Intercalated Hectorite
Acidity Hectorite Infrared spectroscopy Intercalation Silica Surface area
2012/2/8
Silica-intercalated hectorite with an 001 spacing of 12.6 侌 and a N2 BET surface area of 220 m2/ g was prepared by hydrolysis and oxidation at 500亱C of hectorite containing a silicon acetylacetonate c...
Synthesis and Properties of Poorly Crystalline Hydrated Aluminous Goethites
Aluminum Diaspore Goethite Infrared Synthesis Vegard's law X-ray powder diffraction
2012/2/8
Al-substituted goethites were prepared by rapid oxidation of mixed FeCl2-AlCl3 solutions at pH 6.8 in the presence of CO2 at 25亱C. A combination of Al substitution and adsorption of CO2 reduced crysta...