Results 151 to 160 of about 1,542 (190)
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Degradation of Hectorite by Hydrogen Ion
Clays and clay minerals (National Conference on Clays and Clay Minerals), 1955Abstract Hydrogen hectorite-water sol was prepared using mixed-bed ion-exchange resins. At 25° C., the rate of change of concentration with respect to time was determined for (a) strong-and weak-acid hydrogen ions; (b) low molecular weight, unassociated silicates; and (c) soluble, unassociated magnesium ion.
G. T. Kerr +3 more
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Nature of disorder in synthetic hectorite
Applied Clay Science, 2011The disorder of synthetic Na-hectorite was investigated using structural simulation of X-ray powder patterns. The method used to characterize this clay mineral was based on the comparison between experimental and calculated X-ray diffraction profiles.
Salah Karmous, Mohamed +3 more
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Encapsulation of polymer electrolytes into hectorite
Applied Clay Science, 2010Poly (ethylene oxide) (PEO), polyvinylpyrrolidone (PVP), methyl cellulose (Mcel), poly [oligo(ethylene glycol)-oxalate] (POEGO), poly[oxymethylene-(oxyethylene)] (POMOE), and poly[bis-(methoxyethoxyethoxy)phosphazene] (MEEP) were intercalated into hectorite.
Stephen F. Scully, Rabin Bissessur
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Properties of Silica-Intercalated Hectorite
Clays and Clay Minerals, 1981AbstractSilica-intercalated hectorite with an 001 spacing of 12.6 Å and a N2 BET surface area of 220 m2/ g was prepared by hydrolysis and oxidation at 500°C of hectorite containing a silicon acetylacetonate complex. The intercalate swelled to higher spacings upon adsorption of water, glycerol, and pyridine, but the silica was not expelled when the ...
T. Endo, M. M. Mortland, T. J. Pinnavaia
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Stability and Decomposition Products of Hectorite
Clays and clay minerals (National Conference on Clays and Clay Minerals), 1957AbstractThe Hector, California, bentonite has been found unusual in many respects, and its thermal stability under hydrothermal conditions is no exception. It is important that the stability of this bentonite be known, as it is an end member of the saponite series with all cation positions, excluding interlayer, in the structure filled. The information
L. B. Sand, L. L. Ames
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Preparation of Pure Hectorite Using Microwaves
Physics Procedia, 2010 AbstractHectorite, (Si8.0)[Mg6.0−xLix](OH.F)4O20Mn+x/n⋅mH2O is a triocahedral smectite that can be used in multiple fields. Our objective in this work is to obtain pure hectorite by different ways (decantation, treatment with a solution of Na2CO3, change of the reactants ratio) and to study the influence of these procedures on the properties of ...
Yolanda Cesteros +2 more
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Thermal Reactions of Synthetic Hectorite
Clays and Clay Minerals, 1970AbstractThe thermal reaction sequence of a synthetic hectorite (Laponite CP) was studied by X-ray diffraction, i.r. spectroscopy and thermal analysis. Although most of the interlayer water is removed at 200°C, a smally steady weight loss occurs until dehydroxylation is complete at about 700°C, indicating that an anhydrous intermediate phase is not ...
J. M. Green +2 more
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Synthetic hectorite – a new toothpaste binder
International Journal of Cosmetic Science, 1979SynopsisThe use of the synthetic inorganic colloid ‘Laponite’ as a toothpaste binder is reviewed. Variables examined include the effect of polishing agent, humectant type and cellulosic co‐binder. Results indicate that stable pastes may be prepared using a blend of Laponite and sodium carboxymethyl cellulose with a small reduction in overall binder ...
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The morphology of isomorphous substituted hectorites
Colloid and Polymer Science, 2002Small-angle scattering (SAS) is used to investigate geometric structure parameters of isomorphically substituted hectorites. The aluminum content, the layer charge, and the purity of the substituted hectorites are related to the Al supply. The structural information contained in the scattering curves I(h) about the morphology of the samples in four ...
W. Gille, B. Koschel, W. Schwieger
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Highly Selective Low-Temperature Hydrogenation of Furfuryl Alcohol to Tetrahydrofurfuryl Alcohol Catalysed by Hectorite-Supported Ruthenium Nanoparticles [PDF]
Catalysis Communications, 2011 Metallic ruthenium nanoparticles intercalated in hectorite (particle size ~ 4 nm) were found to catalyse the hydrogenation of furfuryl acohol to give tetrahydrofurfuryl alcohol in methanolic solution under mild conditions.
Farooq-Ahmad Khan +2 more
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