搜索结果: 1-15 共查到“地质学 Nontronite”相关记录25条 . 查询时间(0.087 秒)
Possible Role of Microbial Polysaccharides in Nontronite Formation
Biomineralization Extracellular Polysaccharides Microbes Micromorphology Microstructure Nontronite
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2011/12/5
Abstract: Nontronite and microbes were detected in the surface layers of deep-sea sediments from Iheya Basin, Okinawa Trough, Japan. Nontronite, an Fe-rich smectite mineral, was embedded in acidic pol...
Mossbauer and Infrared Study of Heat-Treated Nontronite
CMS Clay SWa-1 Dehydroxylation Infrared Spectra Lithium Migration Mossbauer Spectra Nontronite Superparamagnetic Behavior
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2011/12/2
Abstract: The Mössbauer and infrared spectra of Li- and Rb-saturated nontronites from Washington, USA (SWa-1), heat treated at different temperatures, were measured. The Mössbauer results sh...
Reduction and Reoxidation of Nontronite: Questions of Reversibility
Dehydroxylation Ferric Ferrous Hydroxylation Infrared spectroscopy Iron Mossbauer spectroscopy Nontronite Oxidation
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2011/12/1
Abstract: Redox cycles are common in nature and likely have a profound effect on the behavior of soils and sediments. This study examined a key component of redox cycles in smectites, namely, the reox...
Biogenic Nontronite from Marine White Smoker Chimneys
Authigenic formation Bio-catalysis Hydrothermal Microstructure Nontronite Scanning electron microscopy Silicate smoker chimney
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2011/12/29
Clay samples of greenish colour were collected from submarine hydrothermal chimneys of the Galapagos Rift and Mariana Trough. Mineralogical and chemical investigations of the clay by scanning and tran...
hk-Ordering in Aluminous Nontronite and Saponite Synthesized Near 90°C: Effects of Synthesis Conditions on Nontronite Composition and Ordering
Beidellite Electron diffraction High-resolution electron microscopy hk-order Lattice imaging Layer stacking Nontronite Nontronite synthesis Saponite
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2011/12/28
In studies on the fate of aluminium in the environment, nontronite and saponite have been obtained by synthesis in reducing alkaline conditions close to those prevailing in poorly drained soils develo...
Site Occupancy in Nontronite Studied by Acid Dissolution and M鰏sbauer Spectroscopy
Acid dissolution Mossbauer spectroscopy Nontronite Tetrahedral iron
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2011/11/30
Abstract: The dissolution of two Ca2+-exchanged nontronite samples has been studied in 10% HCl. Early acid-dissolution studies (Osthaus, 1954) have indicated that after two hours of dissolution most o...
57Fe Mossbauer Spectroscopic Study of Structural Changes During Dehydration of Nontronite: Effect of Different Exchangeable Cations
Mossbauer Dehydration Nontronite Cation migration Tetrahedral site
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2012/1/4
Dehydration-induced migration of different exchangeable cations toward the layers of nontronite has been studied by M鰏sbauer spectroscopy. As interlayer water is removed exchangeable cations migrate t...
Detection of Tetrahedral Fe3+ Sites in Nontronite and Vermiculite by M鰏sbauer Spectroscopy
Dehydration Isomorphic substitution Mossbauer spectroscopy Nontronite Tetrahedral iron Vermiculite
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2012/1/4
Mossbauer spectra were obtained for five Ca-exchanged nontronites and one Ca-exchanged vermiculite as the 2-layer hydrates following dehydration at 200癈. Exchange of the samples with Ca2+ and subseque...
Catalysis of Nontronite in Phenols and Glycine Transformations
Catalysis Deamination Decarboxylation Glycine Nontronite Phenol Polycondensation
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2011/12/31
The catalytic power of Ca-nontronite (0.2? 祄) for the polycondensation of phenols and glycine and the associated reactions that involve the ring cleavage of phenols and the decarboxylation and deamina...
Effects of Iron Oxidation State on the Texture and Structural Order of Na-Nontronite Gels
Electron diffraction Ferric iron Ferrous iron High-resolution transmission electron microscopy Layer structure Nontronite
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2011/12/31
Aqueous gels of unaltered (oxidized) and chemically reduced ferruginous smectite (SWa-1 from the Source Clays Repository of The Clay Minerals Society) were characterized by transmission electron micro...
Reduction and Reoxidation of Nontronite: Extent of Reduction and Reaction Rates
Color change Mossbauer spectroscopy Nontronite Oxidation Reduction Visible absorption spectroscopy
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2012/1/4
The reduction and reoxidation of three nontronite samples, GAN (API H-33a, Garfield, Washington), SWa-1 (ferruginous Washington smectite), and NG-1 (Hohen Hagen, Federal Republic of Germany) were stud...
Effects of Iron Oxidation State on the Specific Surface Area of Nontronite
Ethylene glycol-monoethyl ether Iron Nontronite Oxidation Specific surface area
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2012/1/9
The effect of Fe oxidation state on the specific surface area, Sm, of nontronite was studied using the <2-祄, Na+-saturated fraction of the SWa-1 and Garfield nontronite reference clays. The reduction ...
Pyrogallol Transformations as Catalyzed by Nontronite, Bentonite, and Kaolinite
Bentonite Catalysis Humic polymers Infrared spectroscopy Kaolinite Nontronite Nuclear magnetic resonance Pyrogallol
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2012/1/9
The catalytic power of Ca-nontronite, Ca-bentonite, and Ca-kaolinite in promoting the abiotic ring cleavage of pyrogallol (1,2,3-trihydroxybenzene) and the associated formation of humic polymers was s...
Effects of Octahedral-Iron Reduction and Swelling Pressure on Interlayer Distances in Na-Nontronite
Interlayer distance Iron Nontronite Reduction Swelling pressure X-ray powder diffraction
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2012/1/5
A new type of environmental chamber for X-ray diffraction was designed that could sustain elevated, internal pressures of nitrogen or any other gas under oxygen-free conditions and that allowed the po...
Mossbauer Spectroscopic Identification of Iron Oxides in Nontronite from Hohen Hagen, Federal Republic of Germany
Goethite Iron Maghemite Magnetic properties Mossbauer spectroscopy Nontronite
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2012/1/9
Iron impurities in the Hohen Hagen nontronite (NG-1) were identified as maghemite and goethite. The phase identified as maghemite was magnetically ordered at both room temperature and 87 K, with hyper...