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Properties of Organo-Mineral Complexes Formed by Different Addition Sequences of Hydroxy-Al, Montmorillonite, and Tannic Acid
Differential thermal analysis Hydroxy-Al Interlayer space Montmorillonite Organo clay Tannic acid X-ray powder diffraction
2012/1/5
A study was carried out on the influence of the sequence of addition of montmorillonite, hydroxy-Al ions, and tannic acid ([Al] = 0.015 M; 6 mmole Al/g of clay; tannic acid/Al molar ratio = 0.1) on th...
Properties of Hexacyanocobaltate(III)-Exchanged Hydrotalcite-Like Minerals
Adsorption Anion exchange Hexacyanocobaltate Hydrocarbons Hydrotalcite Intercalation
2012/1/5
Hydrotalcite-like minerals, containing Mg2+-Al3+-Xn- (Xn- = NO3-, Cl-, SO42-, or CrO42-), Zn2+-Al3+-NO3-, or Zn2+-Cr3+-NO3- ions, were intercalated with Co(CN)63- by an anion exchange method. For most...
Adsorption Properties of Montmorillonite and Synthetic Saponite as Packing Materials in Liquid-Column Chromatography
Adsorption Electronic absorption Liquid-column chromatography Montmorillonite Ruthenium phenanthroline Saponite
2012/1/10
The adsorption of tris(1,10-phenanthroline)-ruthenium(II) (Ru(phen)32+) by two kinds of colloidally dispersed clays, sodium montmorillonite and synthetic saponite, was studied by spectrophotometric an...
Influence of Silicon and Phosphorus on Structural and Magnetic Properties of Synthetic Goethite and Related Oxides
Electron diffraction Ferrihydrite Goethite Mossbauer spectroscopy Phosphorus Silicon X-ray powder diffraction
2012/1/9
A series of synthetic goethites containing varying amounts of Si and P dopants were characterized by X-ray powder diffraction, electron diffraction, microbeam electron diffraction, and M鰏sbauer spectr...
Cross-linked Smectites. V. Synthesis and Properties of Hydroxy-Silicoaluminum Montmorillonites and Fluorhectorites
Cross-linked smectite Fluorhectorite Hydroxy-SiAl oligocations Pillared montmorillonite Thermal stability
2012/1/11
Solutions containing hydroxy-SiAl (HSA) oligocations were prepared by two procedures: (1) treatment of a mixture of orthosilicic acid and AlCl3 with aqueous NaOH, followed by aging of the product; and...
Cation-Exchange Properties of (Al + Na)-Substituted Synthetic Tobermorites
Cation exchange Cation substitution Cs-exchange Synthesis Tobermorite
2012/1/11
Tobermorite, Ca5Si6O16(OH)2·4H2O, is a hydrous calcium silicate that has a layer-type of structure similar to that of the 2:1 clay minerals. In its natural form, tobermorite exhibits little or no exch...
Properties of Iron Oxides in Two Finnish Lakes in Relation to the Environment of Their Formation
Al-substitution Ferrihydrite Genesis Goethite Iron oxide Lake environment
2012/1/11
Fifteen iron oxide accumulations from the bottoms of two Finnish lakes (搇ake ores? were found to contain as much as 50% Fe. Differential X-ray powder diffraction and selective dissolution by oxalate s...
Synthesis and Properties of Titanium Oxide Cross-Linked Montmorillonite
Cross-linked smectite Montmorillonite Pillared interlayer complex Porosity Thermal stability Titanium oxide
2012/1/13
Titanium was introduced into the montmorillonite structure by cation exchange with polymeric Ti cations, formed by partial hydrolysis of TiCl4 in HCl. On further hydrolysis and heating, TiO2 pillars i...
Acidic Properties of Montmorillonite in Selected Solvents
Acetonitrile Acidic properties Dimethylformamide Hydrolysis Montmorillonite Water
2011/11/25
Abstract: Montmorillonites saturated with Al3+, H+-Al3+, and K+ were titrated in H2O, acetonitrile (AN), and dimethylformamide (DMF) to investigate the acidic properties of the clay in these solvents ...
Ion Exchange, Thermal Transformations, and Oxidizing Properties of Birnessite
Birnessite Bixbyite Buserite Cation exchange Cryptomelane Hausmannite Hollandite Oxidation Thermal treatment
2012/1/12
Synthetic sodium birnessite, having a cation-exchange capacity (CEC) of 240 meq/100 g (cmol/kg) was transformed into Li, K, Mg, Ca, Sr, Ni, and Mn2+ cationic forms by ion exchange in an aqueous medium...
Chemical and Physical Properties of Paleozoic Potassium Bentonites from Kinnekulle, Sweden
Bentonite Igneous intrusion Illite Interstratification Potassium Smectite X-ray powder diffraction
2012/1/12
The <1-祄 fraction of 17 bentonite samples from KinnekuUe, southwest Sweden, were studied by chemical analysis, X-ray powder diffraction, and cation-exchange capacity. The bentonites are interbedded wi...
Swelling Pressure Calculated from Mineralogical Properties of a Jurassic Opalinum Shale, Switzerland
Gouy double layer theory Mineralogical composition Shale Soil mechanics Surface area Surface charge Swelling pressure
2012/2/2
Nineteen drill core samples of lower Dogger opalinum shale from wells drilled in connection with a tunnel project near Brugg, northern Switzerland, were investigated. The shale is a well known swellin...
Properties of Goethites of Varying Crystallinity
Crystallinity Dissolution Goethite Hydrothermal treatment Iron Unit-cell dimension X-ray powder diffraction
2012/2/2
Goethites were synthesized from ferrihydrite in 0.7 M KOH between 4?and 90癈. As temperatures increased, the goethite crystals became larger and of less domainic character, and surface areas decreased ...
Interlayer Water and Swelling Properties of Natural and Homoionic Corrensite
Chlorite Corrensite Dehydration Exchange cations Smectite Water X-ray powder diffraction
2012/1/13
A corrensite-like mineral, from near Borgotaro, Parma (Taro Valley, Italy), was studied by X-ray powder diffraction (XRD) and thermal analysis at different temperatures and water vapor pressures in th...
Cross-linked Smectites. IV. Preparation and Properties of Hydroxyaluminum-Pillared Ce- and La-Montmorillonites and Fluorinated NH4+-Montmorillonites
Cross-linked smectite Hydroxy-Al Montmorillonite Pillared interlayered clays Pore-size distribution Rare earth elements
2012/1/13
Reaction of hydroxy-Al oligocations with Ce3+- and La3+-exchanged montmorillonites, using 1.25, 1.60, or 2.0 mmole Al/g smectite, yielded partially pillared hydroxy-Al montmorillonite products contain...