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Palygorskite in the Eocene Rocks of the Dammam Dome, Saudi Arabia
Dedolimitization Diagenesis Palygorskite Petrography Saudi Arabia Scanning electron microscopy X-ray powder diffraction
2012/1/4
Clay mineralogy and petrography of the Early to Middle Eocene succession of the Dammam dome, Saudi Arabia, comprising the Rus and Dammam Formations, were studied using X-ray powder diffraction, light ...
LOW-TEMPERATURE ALTERATION OF PALYGORSKITE TO SMECTITE
Alkaline solution Hydrothermal transformation Palygorskite Smectite X-ray powder diffraction
2011/11/11
The feasibility of transforming palygorskite from two localities to smectite hydrothermally at temperatures ranging from 22 ~ to 160"C was investigated in a series of laboratory experiments, in which ...
Mechanisms of Palygorskite and Sepiolite Alteration as Deduced from Solid-State 27Al and 29Si Nuclear Magnetic Resonance Spectroscopy
Al coordination Hydrothermal transformation Nuclear magnetic resonance Palygorskite Sepiolite Smectite X-ray powder diffraction
2012/1/6
The mechanisms of palygorskite and sepiolite alteration to smectite under mild hydrothermal conditions were investigated by solid-state 27Al and 29Si magic-angle spinning-nuclear magnetic resonance (M...
PALYGORSKITE IN THE EOCENE ROCKS OF THE DAMMAM DOME, SAUDI ARABIA
Dedolimitization Diagenesis Palygorskite Petrography Saudi Arabia Scanning electron microscopy X-ray powder diffraction
2011/11/4
Clay mineralogy and petrography of the Early to Middle Eocene succession of the Dammam dome, Saudi Arabia, comprising the Rus and Dammam Formations, were studied using X-ray powder diffraction, light ...
Palygorskite was identified as a constituent of fault gouge near Edith Creek.The occurrence is too small to have any economic interest,and the origin is uncertain,but this appears to be the first reco...
Mechanism of Acid Activation of Magnesic Palygorskite
Acid leaching Palygorskite Porosity Silica Surface area
2012/1/5
This paper compares the texture of palygorskite after acid leaching with that of the product after extraction silica is removed. These effects were evaluated on the basis of nitrogen adsorption- desor...
Infrared Studies of Surface Acidity and Reversible Folding in Palygorskite
Infrared spectroscopy Lewis-acid sites Palygorskite Protonation Pyridine
2012/1/9
The infrared absorption spectra of a palygorskite sample from Cáceres, Spain, showed two previously unreported bands in the OH-stretching region at 3420–3440 and 3220–3230 cm−1 after evacuation ...
INFRARED STUDIES OF SURFACE ACIDITY AND REVERSIBLE FOLDING IN PALYGORSKITE
Infrared spectroscopy Lewis-acid sites Palygorskite Protonation Pyridine
2011/11/14
The infrared absorption spectra of a palygorskite sample from Cficeres, Spain, showed two previously unreported bands in the OH-stretching region at 3420-3440 and 3220-3230 cm -~ after evacuation at 9...
THE ELECTRON.MICROPROBE ANALYSIS OF PALYGORSKITE
mineraux argileux palygorskite attaptrlgils microsonde electronique CLAYSTAT diffraction X
2011/11/4
Fifteen samples of palygorskite, from widespread localities,have been investigated. The ubiquitous impurities and exhemely fine grain+ize pose serious problems in many analytical procedures. The elect...
Methylation of Sepiolite and Palygorskite with Diazomethane
Diazomethane Methylation Palygorskite Porosity Sepiolite Silanol
2012/1/13
The methylation of the fibrous clays, sepiolite and palygorskite, should be facilitated by their large content of surface silanol groups and the low acidity and inaccessibility of coordinated water mo...
Palygorskite and Sepiolite Alteration to Smectite Under Alkaline Conditions
Alteration Analcime Cation-exchange capacity Palygorskite Sepiolite Smectite Sodium hydroxide
2011/11/25
Abstract: The instability of palygorskite and sepiolite under soil conditions was investigated to determine if these fibrous minerals transform directly to smectite under laboratory conditions. The tr...
Palygorskite Separation from Dodecylammonium-Treated Clays
Dodecylammonium smectite Hydrophobic properties Mineral separation Palygorskite Sepiolite Smectite
2012/2/2
Three methods were investigated to separate palygorskite from mixtures of clay minerals in soils and sediments. The methods were based on the hydrophobic properties of a dodecylammonium-smectite compl...
DETECTION OF NONEQUIVALENT Si SITES IN SEPIOLITE AND PALYGORSKITE BY SOLID-STATE 29Si MAGIC ANGLE SPINNING-NUCLEAR MAGNETIC RESONANCE
Magic angle spinning-nuclear magnetic resonance Nuclear magnetic resonance Palygorskite Sepiolite Silicon sites
2011/11/16
DETECTION OF NONEQUIVALENT Si SITES IN SEPIOLITE AND PALYGORSKITE BY SOLID-STATE 29Si MAGIC ANGLE SPINNING-NUCLEAR MAGNETIC RESONANCE.
Palygorskite from Tertiary Formations of Eastern Saudi Arabia
Palygorskite Eastern Saudi Arabia
2011/11/4
The occurrence of palygorskite in some Tertiary sediments in eastern Saudi Arabia was studied. Mineralogical analyses were made of samples from two sections
several meters thick from the Umm er Radhu...
Role of Ferric Iron in the Oxidation of Hydrocortisone by Sepiolite and Palygorskite
Catalysis Electron spin resonance Hydrocortisone Iron Oxidation Palygorskite Sepiolite
2012/2/6
The role of adsorbed and structural Fe3+ in palygorskite and sepiolite with respect to the oxidation of hydrocortisone in aqueous suspension has been evaluated using electron spin resonance and UV-vis...