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The Surface Chemistry of Imogolite
Adsorption Basic Stern Model Bond Valence Chloride Imogolite Point-of-Zero Charge Surface Charge
2011/12/2
Abstract: Imogolite is a tubular aluminosilicate which is common in Andosols and Spodosols. The high pH at point-of-zero charge at the outer parts of the tube and the anomalously high chloride adsorpt...
Dielectric-Relaxation Spectroscopy of Kaolinite, Montmorillonite, Allophane, and Imogolite under Moist Conditions
Allophane Bound Water Complex Permittivity Dielectric-Relaxation Spectroscopy Imogolite Interfacial Polarization Kaolinite Montmorillonite Time-Domain Reflectometry
2011/12/2
Abstract: The dielectric behavior of kaolinite, montmorillonite, allophane, and imogolite samples adjusted to a water potential of 33 kPa was examined using a time-domain reflectometry method over a w...
Water Retention by Colloidal Allophane and Imogolite with Different Charges
Allophane Imogolite Net Charge pH Pressure Potential Water Retention
2011/12/8
Abstract: Water retention curves of colloidal allophane and imogolite with different charges and different pretreatments were measured using a tension plate and a pressure plate apparatus. An irrevers...
27Al MAS NMR and Aluminum X-ray Absorption Near Edge Structure Study of Imogolite and Allophanes
Allophane Aluminum Imogolite NMR XANES
2011/12/29
This paper compares the results of 27Al nuclear magnetic resonance spectroscopy (NMR) and Al-K-edge X-ray Absorption Near Edge Structure (XANES) of natural imogolite and allophanes and some crystallin...
The Electrophoretic Mobility of Imogolite and Allophane in the Presence of Inorganic Anions and Citrate
Anion adsorption Cryolite Inner-sphere complex Outer-sphere complex Point of zero charge Point of zero mobility Specific adsorption
2011/12/30
The purpose of this study was to investigate bonding mechanisms of representative inorganic anions and citrate with imogolite and allophane using electrophoresis. The electrophoretic mobility (EM) of ...
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
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 ...
Electrophoretic Behavior of Imogolite Under Alkaline Conditions
Electrophoresis Imogolite Mobility PZC PZNC Viscosity
2011/12/31
Electrophoretic mobility of imogolite has been reported as positive (migration toward the negative electrode) below pH 9, and zero above pH 9. However, when mobility of dilute imogolite suspensions (5...
Sodium and Chloride Sorption by Imogolite and Allophanes
Zero net charge Nuclear magnetic resonance Isomorphic substitution PZC Ion adsorption Permanent charge Salt absorption Intercalation
2011/12/30
The surface excesses of Na and Cl on synthetic imogolite and allophanes with varying Al/Si molar ratios in 0.10 M and 0.01 M NaCl solutions were determined using 22Na and 36Cl as ion probes. The point...
Structure and Thermal Transformations of Imogolite Studied by 29Si and 27Al High-Resolution Solid-State Nuclear Magnetic Resonance
Aluminosilicate gel Crystal structure Dehydroxylation Imogolite Nuclear magnetic resonance Thermal treatment X-ray powder diffraction
2012/1/5
Solid-state nuclear magnetic resonance (NMR) spectroscopy, thermal analysis, and X-ray powder diffraction data on the tubular, hydrous aluminosilicate imogolite were found to be fully consistent with ...
Imogolite Synthesis at 25°C
Fiber Imogolite Infrared spectroscopy Synthesis Transmission electron microscopy
2012/1/11
Imogolite was synthesized at 25°C by aging partially neutralized solutions containing monomeric silicic acid and polymeric hydroxy-aluminum ions for 7 years. Solutions having an initial Si/Al molar ra...
Small-Angle X-Ray Powder Diffraction, Morphology, and Structure of Allophane and Imogolite
Allophane Dehydroxylation Imogolite Infrared spectroscopy Morphology Small angle scattering
2012/2/1
Small-angle X-ray powder diffraction analyses and high-resolution electron microscopy of allophane samples (SiO2/Al2O3 ratio, 1.12 to 1.68) showed that allophanes consist of nearly identical spherical...
Chemisorption of Cu(II) and Co(II) on Allophane and Imogolite
Allophane Chemisorption Cobalt Copper Electron spin resonance Imogolite SiO2/Al2O3
2012/2/6
Adsorption of Cu2+ and Co2+ by synthetic imogolite, synthetic allophanes with a range of SiO2/Al2O3 ratios, and allophanic clay fractions from volcanic ash soils was measured in an ionic medium of 0.0...
Cation and Anion Retention by Natural and Synthetic Allophane and Imogolite
Adsorption Allophane Anion retention Cation retention Imogolite SiO2/Al2O3 ratio Surface charge
2012/2/6
The negative surface charge of synthetic allophanes with a range of Si/Al ratios decreased and positive charge increased with increasing alumina content at a given pH. The phosphate adsorption capacit...
Surface Properties of Allophane, Halloysite, and Imogolite
Adsorption Allophane Halloysite Imogolite Infrared spectroscopy Phosphate Surface charge
2012/2/7
The adsorption of sodium, chloride, and phosphate ions by allophane, imogolite, and halloysite has been studied in relation to the surface structure of the mineral samples. The high adsorption of phos...
Effects of Substitution of Germanium for Silicon in Imogolite
Germanium Imogolite Infrared spectroscopy Ionic substitution Synthesis
2012/2/7
Imogolites in which a part or all of Si was substituted with Ge were synthesized from solutions containing aluminum ion and silicic and/or germanic acid. The products were similar to natural imogolite...