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PRETREATMENT OF SOILS AND CLAYS FOR MEASUREMENT OF EXTERNAL SURFACE AREA BY GLYCEROL RETENTION
SOILS CLAYS GLYCEROL RETENTION
2011/11/15
Heat treatment at 600~ has been the usual procedure for irreversible collapse of expanding clay minerals prior to determination of the external surface area of clays and soils by glycerol retention. E...
The specific surface area (SSA) of clay minerals and related materials is one of their most important properties controlling surface phenomena. The SSA of nonswelling and non-microporous phyllosilicat...
Methylene Blue Dimerization does not Interfere in Surface-Area Measurements of Kaolinite and Soils
Dye Adsorption Ethylene Glycol Adsorption Kaolinite Surface Methylene Blue Dimerization Specific Surface Area
2011/12/5
Abstract: Methylene blue (MB) was adsorbed from aqueous solutions onto a kaolinite and four soil samples to determine the effects of MB dimerization on the measured surface area. Adsorption isotherms ...
Dehydroxylation of Aluminous Goethite: Unit Cell Dimensions, Crystal Size and Surface Area
Al-substitution Crystal size Dehydroxylation Goethite Hematite Specific surface area Unit cell
2011/12/27
This work investigates unit cell dimensions, crystal size and specific surface area of aluminous goethite that was progressively dehydroxylated to form hematite. Goethite synthesized from the ferrous ...
Acid Activation of a Ferrous Saponite (Griffithite): Physico-Chemical Characterization and Surface Area of the Products Obtained
Acid activation Ferrous saponite Free silica Surface area
2011/12/29
A ferrous saponite (griffithite) from Griffith Park (California, USA) was treated with solutions of HCl (0.62, 1.25 and 2.5% by weight) at 25°C for 2, 6, 24 and 48 hours. The resulting solids were cha...
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
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...
Evolution of the Porous Structure and Surface Area of Palygorskite Under Vacuum Thermal Treatment
Adsorption Microcalorimetry Microporosity Palygorskite Surface area Thermal treatment
2011/12/31
The modification of the external surface area and the two types of microporosity of palygorskite (structural and interfiber porosity) were examined as a function of the temperature of a vacuum thermal...
Effects of Iron Oxidation State on the Specific Surface Area of Nontronite
Ethylene glycol-monoethyl ether Iron Nontronite Oxidation Specific surface area
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 ...
Modification of the Porous Structure and Surface Area of Sepiolite Under Vacuum Thermal Treatment
Adsorption microcalorimetry Microporosity Reciprocal thermal analysis Sepiolite Surface area Thermal treatment
2012/1/9
Modifications of the external surface area and the two types of microporosity of sepiolite (structural microporosity and inter-fiber porosity) were examined as a function of the temperature of a vacuu...
Fourier-Transform Infrared Study of Ethylene Glycol Monoethyl Ether Adsorbed on Montmorillonite: Implications for Surface Area Measurements of Clays
Adsorption Attenuated total reflectance spectroscopy Ethylene glycol monoethyl ether Infrared spectroscopy Molecular configuration Montmorillonite
2011/11/25
Abstract: Infrared spectra of 2-ethoxyethanol (ethylene glycol monoethyl ether, EGME) adsorbed on Camontmorillonite were obtained using diffuse-reflectance infrared-Fourier-transform (DRIFT) and atten...
Measurement of the Specific Surface Area of Clays by Internal Reflectance Spectroscopy
Ethylene glycol monoethyl ether Infrared spectroscopy Internal reflectance spectroscopy Molar absorptivity Montmorillonite Surface area
2012/2/2
The specific surface area, S, of a clay is commonly measured by the adsorption of ethylene glycol monoethyl ether (EGME); however, this method can be tedious and time consuming, especially if the clay...
High Surface Area Solids Obtained by Reaction of Montmorillonite with Zirconyl Chloride
Adsorption Exchange Hydroxyzirconium Montmorillonite Surface Zirconium
2012/2/9
Exchange reactions of Na-montmorillonite with zirconyl chloride solutions give products with basal spacings near 18 Å which are stable to 500°C and have surface areas of the order of 300–400 m2/...
Relation between Swelling, Surface Area and b Dimension of Na-Montmorillonites
Expansion Interlayer Montmorillonite Surface Swelling
2012/2/10
From swelling and surface area measurements, it was found that the swelling of a montmorillonite depends linearly on the fraction of its layers that fully expand in water and that this fraction, in tu...
Internal Surface Area of Wyoming Bentonite from Swelling Relationships
Wyoming Bentonite Swelling Relationships Internal Surface Area
2012/2/13
The internal surface area of Na-Wyoming bentonite was determined for linearly swelling pastes, using a physically based equation which describes such swelling. Information required is simply the linea...
Surface Area of Homoionic Illite and Montmorillonite Clay Minerals as Measured by the Sorption of Nitrogen and Carbon Dioxide
Surface Area Homoionic Illite Montmorillonite Clay Minerals Nitrogen Carbon Dioxide Sorption
2012/2/20
The surface areas obtained by application of the B.E.T. theory to adsorption isotherms of nitrogen and carbon dioxide gases at 77°K and 195°K respectively on homoionic samples of illite and montmorill...