Results 221 to 230 of about 26,020 (274)

Modelling of Aniline-Vermiculite and Tetramethylammonium-Vermiculite; Test of Force Fields

Journal of Molecular Modeling, 1999
Molecular mechanics simulations in Cerius2 have been used for modelling vermiculite intercalated with tetramethylammonium and aniline cations. The published structure data obtained for these intercalated structures from X-ray single crystal diffraction have been used to test the force fields and modelling strategy for organo-clays.
Capkova, P., Burda, J.V., Weiss, Z., Schenk, H.   +3 more
openaire   +2 more sources

The Structures of Ornithine-Vermiculite and 6-Aminohexanoic Acid-Vermiculite

Clays and Clay Minerals, 1976
AbstractFourier syntheses have been used to establish the arrangement of organic molecules in the interlamellar regions of a 16.10 Å phase of ornithine-vermiculite and a 16.92 Å phase of 6-aminohexanoic acid-vermiculite. The organic cations form two layers parallel to the silicate surfaces in ornithine-vermiculite and in 6-aminohexanoic acid ...
P. G. Slade, M. I. Telleria, E. W. Radoslovich   +2 more
openaire   +1 more source

Vermiculite: A Review of the Mineralogy and Health Effects of Vermiculite Exploitation

Regulatory Toxicology and Pharmacology, 1995
Vermiculite is a mica-type mineral that is being used in increasing quantities for insulation, in composite cements, and in horticulture. No serious health risks have been found resulting from the exposure to vermiculite alone nor are any anticipated in view of its long-term chemical durability, even with respect to fibers of vermiculite.
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A Discussion of the Water Content of Vermiculite

Clays and clay minerals (National Conference on Clays and Clay Minerals), 1958
AbstractSelected chemical and diffraction analyses from the literature, supplemented by thermal and thermogravimetric analyses and infrared absorption observations, are utilized to construct a rational model of the water arrangement in natural vermiculites.A super cell is arranged by simple modification of the Hendricks water nets to accommodate the ...
W.F. BRADLEY, J.M. SERRATOSA
openaire   +1 more source

Role of vermiculite and zirconium–vermiculite on the formation of zircon–cordierite nanocomposites

Applied Clay Science, 2013
Abstract The Zr 4 + –vermiculites were studied in their new role of the zircon precursor in the clay minerals mixtures which were prepared for firing of the zircon–cordierite nanocomposites. Currently there is a lack of data available about the structure of Zr 4 + –vermiculites, on which this study was performed.
M. Valášková, J. Tokarský, M. Hundáková, J. Zdrálková, B. Smetana   +4 more
openaire   +1 more source

Dehydration and rehydration of vermiculites: III. Phlogopitic Sr- and Ba-vermiculite

Clay Minerals, 1997
AbstractDehydration and rehydration of a phlogopitic vermiculite saturated with either Sr2+ or Ba2+ were studied by thermoanalysis (TG, DSC, DTA) and by in situ X-ray powder diffractometry. A detailed analysis of the relationship between temperature and state of hydration of the vermiculites close to equilibrium at atmospheric pressure was rendered ...
H. Graf v. Reichenbach, J. Beyer
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Microwave Exfoliation of Vermiculite and Phlogopite

Clays and Clay Minerals, 2003
AbstractVermiculites and phlogopites can be exfoliated by chemical and thermal treatment methods to obtain chemically inert, adsorbent, fire-resistant, low-density materials with excellent thermal and acoustic insulation properties. The water content of the clay generally determines the extent of exfoliation and the presence of interstratification is ...
Yorukoglu, A, Girgin, I, OBUT, ABDULLAH
openaire   +3 more sources

Genesis of Vermiculite and Mixed-Layered Vermiculite in the Evolution of the Soils of France

Clays and clay minerals (National Conference on Clays and Clay Minerals), 1961
AbstractAnalysis of the argillaceous fraction of some podzolic soils and podzols of France has shown a double evolution of illite and chlorite through mixed layering into vermiculite. $ilite \to \left( {illite - vermiculite) \to vermiculite} \right) \\ chlorite \to \left( {chlorite - vermiculite} \right) \to vermiculite \\$Vermiculite is more ...
Georges Millot, Thérèse Camez
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Antibacterial efficiency of vermiculite/chlorhexidine nanocomposites and results of the in vivo test of harmlessness of vermiculite

Materials Science and Engineering: C, 2014
Clay minerals have been proposed as very useful materials for modulating drug delivery. These are the commonly used materials in pharmaceutical production both as inorganic carriers or active agents. We focused on the development of suitable long-acting material for local treatment of oral infection where clay minerals act as inorganic drug carriers ...
Sylva, Holešová, Jan, Stembírek, Ladislava, Bartošová, Gabriela, Pražanová, Marta, Valášková, Magda, Samlíková, Erich, Pazdziora   +6 more
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The Vermiculitization of Trioctahedral Micas

Clay Minerals, 1973
AbstractThe alteration of thirty-nine trioctahedral micas to vermiculite has been characterized by the K level, which is determined by repeated measurements of the stationary K concentration in the altering solution and provides a practical way of comparing the sensitivity to alteration.
J. M. Rousseaux, P. G. Rouxhet, L. A. Vielvoye, A. J. Herbillon   +3 more
openaire   +1 more source