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Na, K, Rb and Cs exchange in heulandite single crystals: Diffusion kinetics
Na K Rb Cs exchange heulandite single Diffusion kinetics
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2012/4/5
Diffusion-exchangekineticsweredeterminedattemperaturesbetween320and425KforNa
insinglecrystalsofnaturalheulandite,Na Ca K (Al Si O )!/n O,and
0.96 3.54 0.09 8.62 27.51 72 2K,Rb ,andCs forNa inNa-exch...
Multi-site order-disorder kinetics in crystalline solids: A generalized formulation
Multi-site order-disorder kinetics crystalline solids generalized formulation
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2012/4/5
Manycrystallinesolidshavemultiplenonequivalentsitesamongwhichdifferentatoms
showsubstitutionallong-rangeorder-disorderphenomena.Theorder-disorderkineticsof
anatomamongany n nonequivalentsitesinacrys...
Surface structural controls on pyrite oxidation kinetics: An XPS-UPS, STM, and modeling study
controls pyrite oxidation kinetics XPS-UPS STM modeling study
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2012/4/6
X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS,respectively) and scan-ning tunneling microscopy (STM) were used to observe the initial oxidation of pyrite surfaces in air. The results s...
High-temperature Raman spectroscopic and X-ray diffraction study of β-Mg2SiO4: Insights into its high-temperature thermodynamic properties and the β to α phase-transformation mechanism and kinetics
High-temperature Raman spectroscopic X-ray diffraction study β-Mg2SiO4 Insights high-temperature thermodynamic properties the β to α phase-transformation mechanism kinetics
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2012/4/5
Weperformed in-situ Raman spectroscopy and X-ray diffraction experiments at high temperature and ambient pressure to investigate the intrinsic anharmonic properties of {J-Mg2Si04and the mechanism and ...
The Use of Color to Quantify the Effects of pH and Temperature on the Crystallization Kinetics of Goethite Under Highly Alkaline Conditions
Color Colorimetry Crystallization Goethite Hematite Kinetics L*a*b* color space
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2011/12/28
The crystallization kinetics of goethite were studied colorimetrically under highly alkaline conditions (pH 10.1–12.2) at temperatures from 40° to 85°C. Color changes during crystallization from fresh...
Influence of Citrate on the Kinetics of Fe(II) Oxidation and the Formation of Iron Oxyhydroxides
Citrate Goethite Hydrolysis Iron oxyhydroxide Lepidocrocite Oxidation
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2011/11/30
Abstract: The rate of Fe(II) oxidation at a constant rate of oxygen supply in the presence of citrate was measured at pH 6.0 at various citrate/Fe(II) molar ratios at 23.5°C in 0.01 M ferrous perchlor...
Kinetics of Dissolution of Noncrystalline Oxides and Crystalline Clay Minerals in a Basic Tiron Solution
Chlorite Dissolution Kaolinite Montmorillonite Noncrystalline Sepiolite Tiron solution
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2012/1/4
The dissolution behavior of five noncrystalline oxides, montmorillonite, kaolinite, chlorite, and sepiolite in a basic tiron solution was studied at pH 10.5 and 80°C. The results show that for montmor...
Reexamination of the Kinetics of the Thermal Desorption of Dimethylsulfoxide and N-Methyl Formamide From a Greensplatt Kaolin
Activation energy Desorption Dimethylsulfoxide Kaolinite N-methyl formamide Thermal treatment
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2011/11/28
Abstract: The kinetics of the thermal decomposition of the kaolin: dimethylsulfoxide (kaolin: DMSO) and the kaolin: N-methylformamide (kaolin: NMF) intercalates have been reexamined. Two different sam...
Vapor-Phase Sorption Kinetics for Tetrahydrofuran, Tetrahydropyran, and 1,4-Dioxan by Al3+- and Cr3+-Exchanged Montmorillonite
Adsorption Cyclic ethers Diffusion Montmorillonite Vapor
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2012/1/11
The rate of vapor-phase sorption of tetrahydrofuran (THF), tetrahydropyran (THP), and 1,4-dioxan (DIOX) onto a Wyoming montmorillonite saturated with Al3+ or Cr3+ has been studied by isothermal gravim...
Vapor-Phase Sorption Kinetics for Methanol, Propan-2-OL, and 2-Methylpropan-2-OL on Al3+-, Cr3+-, and Fe3+-Exchanged Montmorillonite
Adsorption Alcohol Diffusion Grain size Mass transfer Montmorillonite
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2012/1/11
The rate of sorption of methanol (MeOH), propan-2-ol (i-PrOH), and 2-methyl-propan-2-ol (t-BuOH) onto a Wyoming montmorillonite saturated with Al3+-, Cr3+-, or Fe3+-cations has been studied by isother...
Review of the Diffusion of Water and Pyridine in the Interlayer Space of Montmorillonite: Relevance to Kinetics of Catalytic Reactions in Clays
Catalysis Diffusion Interlayer space Kinetics Montmorillonite Pyridine Water
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2012/2/1
With the current interest in the use of transition metal-exchanged phyllosilicates as catalysts for novel organic syntheses, investigations into the factors which affect the movement of reactant, prod...
Development of Layer Charge and Kinetics of Experimental Smectite Alteration
Alteration Hydrothermal Illite Layer charge Nuclear waste repository Smectite
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2012/1/13
Sodium-saturated Wyoming bentonite was hydrothermally reacted at 150亱 and 250亱C for 30 to 180 days to determine smectite alteration rates that might be applied to nuclear-waste repository design. Na-C...
Hydrolysis Kinetics of Organic Chemicals on Montmorillonite and Kaolinite Surfaces as Related to Moisture Content
Humic acid Hydrolysis kinetics Kaolinite Montmorillonite Surface acidity Water
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2011/11/25
Abstract: The effect of the surface acidity of montmorillonite and kaolinite on the hydrolysis rate constants of different agricultural chemicals was studied at variable moisture contents. Ethyl aceta...
Kinetics of Glass Dissolution and Zeolite Formation Under Hydrothermal Conditions
Clinoptilolite Dissolution Kinetics Mordenite Phillipsite Synthesis Volcanic glass Zeolite
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2012/2/8
After a temperature-dependent period when little dissolution occurs, the dissolution of rhyolitic glass can be described by dC/dt = k(Cs − C), where Cs is the concentration of dissolved silica a...
Dissolution Kinetics of Phlogopite. II. Open System Using an Ion-Exchange Resin
Dissolution Ion-exchange resin Kinetics Open system Mica Phlogopite
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2012/2/8
The rate of dissolution of phlogopite in an open system was measured at low temperature and pressure and at pH 3–5. The maximum dissolution rate was achieved by maintaining extremely low ionic concent...