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Your search keyword '"Cuadros, Javier"' showing total 4 results
Start Over Author "Cuadros, Javier" Journal american journal of science
4 results on '"Cuadros, Javier"'

1. Experimental study of the hydrothermal formation of smectite in the beidellite-saponite series

Author

Huertas, F. Javier, Cuadros, Javier, Huertas, Francisco, and Linares, Jose

Subjects
Smectite -- Environmental aspects, Kaolinite -- Environmental aspects, Mineralogical research -- Analysis, Clay -- Analysis, Clay minerals -- Environmental aspects, Earth sciences
Abstract

Research indicates that smectite, a clay mineral, emerges from an intermediate phase in the formation of kaolinite from silicate gels. Studies were conducted for both dioctahedral and trioctahedral smectite.

Published
2000

2. Interlayer cation effects on the hydration state of smectite

Author

Cuadros, Javier

Subjects
Smectite -- Research, Soil absorption and adsorption -- Research, Earth sciences
Abstract

An experiment using XRD and TG analysis as well as BET surface area measurements is conducted to determine the effects of humidity on a mixed-layer of illite/smectite containing 11% of illite. Results show that exchange cation influences the absorptive capacity of clay by affecting the surface area of the said material. The number of water moles found per half formula unit of the clay is estimated to be 4.5.

Published
1997

3. Weathering of phlogopite to beidellite in a karstic environment

Author

Aldega, Luca, Cuadros, Javier, Laurora, Angela, and Rossi, Antonio

Subjects
Electron microscopy -- Usage, Mica -- Composition, Mica -- Chemical properties, Silicate minerals -- Composition, Silicate minerals -- Chemical properties, Weathering -- Environmental aspects, X-rays -- Diffraction, X-rays -- Analysis, Earth sciences
Published
2009

4. Analysis of Fe segregation in the octahedral sheet of bentonitic illite-smectite by means of FTIR, 27Al MAS NMR and reverse Monte Carlo simulations

Author

Cuadros, Javier, Sainz-Diaz, Claro I., Ramirez, Rafael, and Hernandez-Laguna, Alfonso

Subjects
Iron -- Research, Bentonite -- Research, Smectite -- Research, Fourier transform infrared spectroscopy -- Usage, Nuclear magnetic resonance spectroscopy -- Usage, Monte Carlo method -- Usage, Earth sciences
Abstract

A series of bentonite illite/smectite with a range of Fe content (0.08-0.95 atoms per half formula unit) and illite composition (3-97% illite) was analyzed by Fourier transform infrared spectroscopy, 27Al magic-angle spinning NMR spectroscopy and theoretical computations by reverse Monte Carlo simulations. All samples showed a high dispersion of the Mg cations and a tendency for Fe segregation which increased with progressing illitization. The illite-rich samples indicated medium- or long-range ordering of the octahedral cations.

Published
1999

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