Showing papers in "Applied Clay Science in 2004"

TL;DR: In this article, the acid-base titration of Na-montmorillonite suspensions between pH 4 and 9 at 0.01, 0.1 and 1 M NaCl was used to characterize pH-dependent charge development on amphoteric edge sites and to determine the point of zero charge (PZC) of edges.

TL;DR: In this article, the influence of temperature (between 20 and 80 °C) on some hydro-mechanical properties of a compacted bentonite has been investigated, showing that the water retention capacity at higher temperature, both in confined and unconfined conditions, is lower.

TL;DR: Clay-modified electrodes (CLMEs) have received attention in the development of electrochemical sensors and biosensors as discussed by the authors, and the analytical applications reported for CLME range from the preconcentration method applied to the detection of metal cations or organic molecules (i.e., water pollutants and drugs), to electrocatalytic sensors involving intercalated redox mediators in the electrochemical detection process, and finally to amperometric and potentiometric sensors.

TL;DR: Considering the selectivity sequence of the clinoptilolite and antibacterial activity results, Ag-clinoptillite seemed to be promising antibacterial material.

TL;DR: In this paper, the anti-inflammatory drug Fenbufen has been intercalated into layered double hydroxides for the first time by co-precipitation under a nitrogen atmosphere.

TL;DR: In this article, the authors investigated the influence between the degree of saturation and the physical/mechanical properties for Tournemire shale rock and found that the internal fluids could be drastically modified and, in particular, the presence of water in the rock with regard to hydration and desiccation.

TL;DR: In this paper, fire retardant acrylonitrile-butadiene-styrene (ABS)/montmorillonite (MMT) nanocomposites were prepared by direct melt intercalation of ABS, organophilic clay and conventional fire retardants (decabromodiphenyl oxide (DB) and antimony oxide (AO)).

TL;DR: Kromer et al. as discussed by the authors studied the effect of heat treatment on the fired mineralogy of the fired products of three representative clays, a high kaolinitic (HB), illitic-and quartz-rich (KW), and naturally mixed kaolinite-illite (P1) clays of Westerwald area.

TL;DR: In this article, the characteristics of two clays used for red ceramic production in Campos dos Goytacazes, southeast of Brazil, were investigated by X-ray diffraction, chemical analysis, as well as granulometric and plasticity measurements.

TL;DR: In this article, DTA curves of organo-clays are divided into three regions: (1) the dehydration of the clay, (2) the thermal oxidation of the organic material and (3) the dehydroxylation of the clays.

TL;DR: In this article, the short-term and long-term behavior of the Callovo-Oxfordian argillite core samples taken from the Meuse/Haute-Marne Underground Research Laboratory (MHM-URL) in Eastern France were investigated.

TL;DR: In this article, the authors studied the sorption and desorption kinetics of cesium and uranium on bentonite colloids in a granitic reduced environment, carried out in anoxic conditions under N 2 atmosphere.

TL;DR: In this paper, the fracture network in the excavation-disturbed zone (EDZ) of an argillaceous formation, the Opalinus Clay in the Mont Terri Rock Laboratory in Switzerland, is characterized by applying structural and hydrogeological techniques.

TL;DR: In this paper, it was shown that short-chain organoclays are better sorbents for relatively hydrophilic or slightly hydrophobic compounds and that the opposite should be true for highly hydrophoric compounds.

TL;DR: In this paper, the authors conducted a testing program that focused on creep tests on Clayey rock, which may be the host medium for a French long-term nuclear-waste storage facility.

TL;DR: In this paper, the hydraulic conductivity of sand-bentonite mixtures was investigated by experiments and evaluated quantitatively the hydraulic-conductivities of backfill materials to design specifications, such as dry density and bentonite content, for high level nuclear waste disposal in Japanese project.

TL;DR: In this paper, the influence of high-pH value of the virgin clay on the pH of the used mineral waters is shown to influence the temperature reached by the peloid muds after 20 min of application (calculated after an innovative mathematical model).

TL;DR: In this paper, the effects of soil mineralogy on aggregate stability, seal formation and micromorphology, and on the associated infiltration rate (IR), runoff and soil loss were investigated.

TL;DR: In this paper, a correlation between the Atterberg limits and clay mineralogy is proposed, which increases the understanding between clay mineralogists and engineers in soil mechanics; additionally, a wealth of information in clay mineralology literature is now available to predict the mechanical behaviour of clays via index tests.

TL;DR: In this article, the authors assess the possible use of Italian zeolitic rocks for the production of lightweight aggregates, in particular both the expansion at high temperature and the technological features of fired products were investigated.

TL;DR: In this article, the adsorption of uranyl on standard Georgia kaolinites (KGa-1 and Kga-1B) was studied as a function of pH (3-10), total U (1 and 10 μmol/l), and mass loading of clay (4 and 40 g/l).

TL;DR: In this article, the P sorption behavior and mechanisms of phosphates were investigated for synthetic montmorillonite, beidellite, saponite, and fluor-tetrasilicic expandable mica pillared with cationic, Keggin ion-like, Al clusters (Alclst).

TL;DR: In this article, the hydraulic conductivity of BEZ with different bentonite content was investigated for possible use as barrier material, as an alternative to bentonite-embedded sand (BES).

TL;DR: In this paper, the adsorption properties of organo-bentonites obtained through the modification performed at 25, 50, and 100% of the cation exchange capacity (CEC) using tetradecyl trimethylammonium bromide (TDTAB) and hexadecyl trichlorohexadecylammonium bipartite (HDTAB).

TL;DR: In this paper, a long-term diffusion experiment, termed DI-A, is carried out at the Mont Terri Rock Laboratory in the Opalinus Clay formation, which is the understanding of the migration and sorption behavior of cationic and anionic species in consolidated clays.

TL;DR: In this article, a refined diffuse double layer (DDL) approach was used to model porewater composition in a compacted bentonite backfill surrounded by argillaceous host rock, as foreseen for the Swiss high-level waste repository.

TL;DR: The Pentalofos zeolite mine in Greece was studied by optical microscopy, X-ray diffraction (XRD) and Fourier Transform IR (FTIR) spectroscopy, in combination with thermoanalytical methods (TG/DTG) and differential thermal analysis (DTA) as mentioned in this paper.

TL;DR: In this article, a parametric study coupled with molecular modeling of three different families of ion-dipole bonding molecules is described in detail, and it appears that the head group of the molecule is one of the principal factors controlling selfassembly but the chain length of the alkyl group also plays a role.

TL;DR: Palygorskite from the ancient mine of Sacalum, Yucatan, Mexico was mineralogically characterized and its applicability as drilling muds was evaluated as mentioned in this paper.

TL;DR: In this article, aqueous and ethanolic solutions of hexadecyltrimethylammonium (HDTMA) bromide have been reacted with layer silicates of different charge.