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Structural Study of Monomethylammonium and Dimethylammonium-Exchanged Vermiculites
Dimethylammonium-Exchanged Vermiculite Monomethylammonium-Exchanged Vermiculite Organoclay Tetramethylammonium-Exchanged Vermiculite Tetramethylphosphonium-Exchanged Vermiculite
2011/12/7
Abstract: Vermiculite crystals from Santa Olalla, Spain, were first Na exchanged and then intercalated with monomethylammonium (= NH3(CH3)+, MMA) and dimethylammonium (= NH2(CH3)2+, DMA) molecules, re...
Reaction of OH-Al Polymers with Smectites and Vermiculites
Smectite Vermiculite OH-Al Pillared clay
2011/12/30
Five montmorillonites, one hectorite, and two vermiculites were treated with OH-Al solutions containing rapid- and slow-reacting polymers of similar concentrations. With all smectites, both rapid- and...
Interlayer Structures of the Two-Layer Hydrates of Na- and Ca-Vermiculites
Crystal structure Fourier projection Hydrates Interlayer cation Vermiculite
2011/11/25
Abstract: The three-dimensional order shown by the two-layer hydrates of Na- and Ca-vermiculite, prepared from Mg-vermiculite from Llano, Texas, has enabled clear, two-dimensional Fourier projections ...
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...
Effect of Photolytic Oxalate Treatment on Soil Hydroxy-Interlayered Vermiculites
Hydroxy-interlayer Iron oxide Noncrystalline Oxalate extraction Photolytic reaction Soil Vermiculite
2012/2/8
The effects of Na-citrate-dithionite (NaCD), ammonium oxalate in the dark (NH4Ox-D), and photolytic reaction under ultraviolet radiation (NH4Ox-P) on the mineralogy of <2-µm fractions of selecte...
Iron Oxidation and Reduction Effects on Structural Hydroxyl and Layer Charge in Aqueous Suspensions of Micaceous Vermiculites
Iron Oxidation Structural Hydroxyl Layer Aqueous Suspensions Micaceous
2012/2/15
Four Na2S2O4-reduced Na-vermiculites, each with some trioctahedral mica interstratified, were oxidized with H2O2 at pH 6·5 and again reduced with Na2S2O4 in suspensions at pH 7·5–8·0. The layer charge...
Mica-Derived Vermiculites as Unstable Intermediates
Mica-Derived Vermiculites Unstable Intermediates
2012/2/15
Stability determinations were made by solubility methods on two trioctahedral mica-derived vermiculites. The phlogopite-derived vermiculite was found to be unstable under acid solution conditions, whe...
Exchangeable Cation Distribution in Nickel- and Magnesium- Vermiculites
Exchangeable Cation Distribution Magnesium- Vermiculites
2012/2/15
Abnormal scatterings of X-rays take place between Bragg spots. Their study in hydrated Mg- and Ni-vermiculites shows that they appear in reciprocal space in the form of modulated lines, elongated alon...
Extinction Bend Contours in Electron Microscopy of Clay-Size Mica-Vermiculites
Extinction Bend Contours Electron Microscopy Clay-Size Mica-Vermiculites
2012/2/17
Extinction bend contours, observed in Cs-treated mica-vermiculites by transmission electron microscopy, give information on the morphology and crystal orientation and continuity in individual particle...
Deferration Effect on Structural Ferrous-Ferric Iron Ratio and CEC of Vermiculites and Soils
Deferration Structural Ferrous-Ferric Iron Ratio CEC Vermiculites Soils
2012/2/21
Deferration by reduction of free Fe2O3 with Na2S2O4 in the presence of Na citrate and NaHCO3 caused a change in valence state of 10 to 35 per cent of the total structural iron in micaceous vermiculite...
Properties of Vermiculites and Smectites: Expansion and Collapse
Properties Vermiculites Smectites Expansion Collapse
2012/2/21
Samples of smectites and vermiculites were evaluated to (1) determine the effects of source and amount of charge, (2) determine if a continuum of properties exists, and (3) improve the basis for diffe...
Properties of Vermiculites and Smectites: Expansion and Collapse
Vermiculites Smectites Expansion Collapse
2011/11/16
Recent reports have suggested that the smectites and vermiculites exhibit a continuum in properties. This, in association with differences in methods and criteria between investigators, suggests the n...