搜索结果: 16-30 共查到“地质学 cations”相关记录50条 . 查询时间(0.125 秒)
Disorder among network-modifier cations in silicate glasses: New constraints from triple-quantum 17O NMR
Disorder network-modifier cations silicate glasses New constraints triple-quantum 17O NMR
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2012/4/6
Thestateoforderingamongnetwork-modi?ercationsinmoltensilicateshasapoten-tiallylargeeffectontheiroverallcon?gurationalentropy,onfreeenergiesofmixing,and
onviscosityanddiffusivity.Mostmodelsofthermodyn...
Montmorillonite under high H2O pressures: Stability of hydrate phases, rehydration hysteresis, and the effect of interlayer cations
Montmorillonite high H2O pressures Stability hydrate phases rehydration hysteresis effect interlayer cations
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2012/4/1
Dehydration of Ca- and Mg-exchanged montmorillonite was studied along H20 iso-
chores in the hydrothermal diamond-anvil cell by in situ X-ray diffraction using a syn-
chrotron radiation source. At-r...
Molecular Structure Effects on Diffusion of Cations in Clays
Clay-modified electrodes Co complexes Diffusion Transport
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2011/12/27
Abstract: The roles of molecular structure and charge are examined in the transport of cations within montmorillonite clay films. The series of Ru(NH3)63+, Co(NH3)3+, Co(en)33+, Co(sep)3+ and Co(bpy)3...
The use of Monte Carlo methods to determine the distribution of Al and Si cations in framework aluminosilicates from 29Si MAS NMR data
Monte Carlo methods distribution Al and Si cations framework aluminosilicates 29Si MAS NMR data
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2012/4/5
AMonteCarlo method wasdeveloped to determine the distribution ofAland Sications from 29SiMASNMR data for framework aluminosilicates. The method wasused to an-alyze data obtained from Cs-exchanged leuc...
The Cryptand [222] for Exchanging Cations of Micas
Biotite Cryptand Exchange Lithium Mica Muscovite Phlogopite Potassium Rubidium Strontium
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2011/12/28
Cation exchange experiments were carried out on phlogopite, biotite, and muscovite using cryptand [222] as a complexing agent, dioxane as solvent, and Li as the exchanging cation. The results indicate...
Effects of Exchangeable Cations on Hydraulic Conductivity of a Marine Clay
Consolidation Dispersion Exchangeable cation Hydraulic conductivity
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2011/12/28
A laboratory study of the hydraulic conductivity (HC) of a marine clay with monovalent, divalent and trivalent cations revealed large differences in HC. The exchangeable cations employed in this study...
Intercalation of Tetraalkylammonium Cations into Smectites and its Application to Internal Surface Area Measurements
Hectorite Intercalation Internal surface area Montmorillonite Quaternary ammonium cations Smectite Tetraalkylammonium cations
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2011/12/1
Abstract: Monolayer to bilayer (MTB) and bilayer to pseudotrimolecular (BTP) transitions were observed for smectites exchanged with symmetrical tetraalkylammonium cations of increasing sizes: +NR4, wh...
Study of the Nature of Acid Sites of Montmorillonites Pillared with Aluminium and Oligosilsesquioxane Complex Cations. 1. Bronsted Acidity
Bronsted acidity Diffuse reflectance IR-spectroseopy Montmorillonites Pillared clays
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2011/12/29
Two samples, obtained by pillaring a Wyoming montmorillonite with hydroxy aluminium and oligosilsesquioxane cations, were studied by stepwise thermal desorption of ammonia and by highly sensitive diff...
Hysteresis in the Binary Exchange of Cations on 2:1 Clay Minerals: A Critical Review
cation exchange hysteresis quasi-crystal crystalline swelling kinetics smectites
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2011/12/28
The binary exchange of cations on clays and soils is generally regarded as a thermodynamically reversible process. The literature on soil chemistry and geochemistry, however, abounds with reports on c...
Adsorption of Cations on Imogolite and Their Effect on Surface Charge Characteristics
Electrophoretic mobility Microelectrophoresis Noncrystalline aluminosilicates Points of zero charge Potentiometric titration PZC PZNPC PZSE
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2011/12/31
Noncrystalline aluminosilicates termed allophane and imogolite are common constituents of spodosols, soils derived from volcanic ash, and many inceptisols. The surface charge characteristics of their ...
Use of Methylene Blue and Crystal Violet for Determination of Exchangeable Cations in Montmorillonite
Cation exchange capacity Crystal violet Exchangeable cations ICP Methylene blue Montmorillonite Organic cations
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2012/1/4
A procedure for the determination of cation exchange capacity (CEC) and the amounts of exchangeable cations adsorbed to montmorillonite is proposed. The method consists of a single incubation of the c...
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...
The Effect of Heat Treatments on the Total Charge and Exchangeable Cations of Ca-, Na-, and Li-Saturated Kaolinite
Kaolinite Cation exchange capacity Water adsorption Lithium retention
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2011/12/31
The effect of heat treatments on the total charge and water adsorption by Ca-, Na- and Li-saturated kaolinite was studied using extraction techniques and thermal gravimetric analysis, respectively. Me...
Influence of Exchangeable Cations on the Surface Free Energy of Kaolinite as Determined from Contact Angles
Contact angle Dispersion Kaolinite Surface free energy Wettability
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2012/1/5
The influence of adsorbed H+, Na+, K+, Ca2+, Mg2+, Ba2+, and Al3+ ions on the wettability of a kaolinite surface was determined from contact angles, which were measured in kaolinite-water drop- air (s...
Reactions of Polynuclear Hydroxyaluminum Cations with Montmorillonite and the Formation of A 28-A Pillared Complex
Fourier transform Hydroxy-Al Montmorillonite Pillared interlayer complex Thermal stability
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2012/1/9
Polynuclear hydroxy-Al cations were prepared by partially neutralizing dilute solutions of aluminum chloride. These cations were introduced in the interlayer space of montmorillonite by cation exchang...