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Showing papers in "Applied Clay Science in 1989"


Journal ArticleDOI
TL;DR: In contrast to the Atterberg liquid limit and the rheological behaviour of aqueous clay suspensions, the charge at the edge of the clay particle seems to have little influence on the shear strength as mentioned in this paper.

289 citations


Journal ArticleDOI
TL;DR: In this paper, the authors show that the flow of kaolin and bentonite dispersions is determined by edge(+)/face(−) contacts (card-houses) in an acidic medium and face(−)/face-− contacts (band-like structures) in a alkaline medium.

286 citations


Journal ArticleDOI
TL;DR: In this paper, the decolorisation of rape-seed oils by a recently discovered Tunisian bentonite was tested and it was proved that this clay has a valuable high decolorizing power after appropriate activation by acids.

132 citations


Journal ArticleDOI
TL;DR: In this paper, the functions of this bentonite backfill are described and some investigations of the important properties as swelling and water uptake are presented, in order for the radioactive material to leak out into the biosphere, water from the surrounding rock has to reach the steel canisters, and these have to be broken through by corrosion.

99 citations


Journal ArticleDOI
TL;DR: In this paper, a collection of sixteen representative samples of various types of products has been analyzed, and the relevant data have been used in the discussion on the mineralogical differences between the various kinds of products.

81 citations


Journal ArticleDOI
TL;DR: The structural and textural evolution of two Spanish palygorskites, one magnesium-rich and another aluminium-rich, activated with hydrochloric acid of different concentrations, has been studied as discussed by the authors.

49 citations


Journal ArticleDOI
TL;DR: In this article, the thermal expansion of four samples of vermiculite, one sample containing mica and mica interstratification from various geological origins have been studied, and it is suggested that the sudden release of interlayer water is not the only factor influencing the temperature expansion of these samples, e.g. the presence of relicts of altered mica, loss of OH groups or chemical composition.

48 citations


Journal ArticleDOI
TL;DR: In this article, the effect of pH and the clay surface interactions with electrolytes of varying anionic to cationic ratio composition and concentration were studied via electrophoresis.

34 citations


Journal ArticleDOI
TL;DR: The effect of some clay minerals as support for methane production by an anaerobic process was studied in this article, where the authors used a mixture of natural and treated sepiolite, vermiculite and montmorillonite.

33 citations


Journal ArticleDOI
TL;DR: In this article, a 3-layer-arrangement of clays is proposed for sealing waste deposits. And the authors show that the clays are most effective in case of 3 layers, i.e., organophilic montmorillonite for the sorption of nonaqueous constituents from the deposit or biological degradation thereof, sodium montmoroniite as a highly swollen water sealing layer and calcium montmorilloite for compensation of changes in thickness and permeability of the two layers above.

31 citations


Journal ArticleDOI
TL;DR: In this paper, the influence of different factors affecting the nature of reaction products has been investigated (composition of clay-carbonate mixtures, time and temperature of heat treatment) when using these reaction products as sources of alumina and silica, with additional aluminum, they obtain molecular sieve zeolites of types A and X with a high degree of crystallinity and free from any other crystalline phase such as hydroxysodalite or zeolite P.

Journal ArticleDOI
TL;DR: In this article, the influence of structural and surface properties of non-convex materials on their catalytic power and reaction sites in the formation of hydroquinone-derived humic polymers was investigated.

Journal ArticleDOI
TL;DR: In this paper, the degradation of dexamethasone in an aqueous suspension of montmorillonite seems to be the result of two apparent first order reactions, namely adsorption and degradation.

Journal ArticleDOI
TL;DR: In this article, the adsorption of p-nitrophenol (pNP) was used for measuring the specific external and total surface area of Na + - and Ca 2+ -saturated soil samples.

Journal ArticleDOI
TL;DR: In this paper, the suitability of the black soil clays of northeastern Nigeria as drilling muds have been investigated and the results show that the clays are not directly suitable for oil-drilling muds.

Journal ArticleDOI
TL;DR: In this paper, a mixture of 1:1 type clay minerals was used as raw materials for nitride production, and the resulting mixture was heated in N 2, where the mixture was converted into β'-sialon and AIN.

Journal ArticleDOI
TL;DR: In this article, the effect of a steam phase on selected properties of an uncompacted montmorillonite clay was examined and it was shown that steam significantly affects the specific volume (SV) of the clay even at temperatures as low as 110°C.

Journal ArticleDOI
TL;DR: In this paper, high-resolution transmission electron microscopy (HRTEM) and small-angle X-R diffusion (SAXRD) were used to better understand and characterize the structural changes of smectite layers.

Journal ArticleDOI
TL;DR: In this paper, two transport mechanisms can be distinguished in a clay: (1) diffusion, for which the propelling force is the concentration gradient of the diffusing ions; and (2) water pressure gradient.

Journal ArticleDOI
TL;DR: In this paper, the formation of clay minerals during wet grinding is interpreted in terms of mechanochemical reactions, and the grinding of rocks in water is suggested as a possible technique for clay mineral syntheses.

Journal ArticleDOI
TL;DR: In this paper, natural and treated sepiolite, vermiculite and montmorillonite were studied as supports in cultures of methanobacteria and sulphate-reducing bacteria.

Journal ArticleDOI
TL;DR: A smectite has been produced from kaolinite in the temperature range 160°-300°C in liquid water by treatment with silicic acid, calcium oxide, magnesium hydroxide and sodium silicate.

Journal ArticleDOI
TL;DR: In this paper, single-sensor piezometer probes, 8 mm in diameter, were developed and tested for deep-ocean geotechnical investigations in support of the Subseabed Disposal Program.

Journal ArticleDOI
TL;DR: In this paper, the mineralogical and chemical characteristics of seven clayey samples, representing the overburden of the iron ore deposits of the El-Gedida area, Bahariya Oasis in Egypt, were determined.

Journal ArticleDOI
TL;DR: The role of cementing connectors in Polish loess is insignificant as discussed by the authors, and the skeletal microstructure of loess has been defined by the collapsing index imp, which shows that only an aeolian, typical younger nonweathered loess (LM) with clayey types of connectors shows metastable structures (imp>0.02).

Journal ArticleDOI
TL;DR: The adsorption of methyl carbamate by Na-, Mg-, Al, and Cu-montmorillonite has been studied by infrared spectroscopy and X-ray diffraction.

Journal ArticleDOI
TL;DR: In this article, the effect of wt. % clay and water on compressive strength, shear strength and gas permeability of sand bonded by kaolinitic clay from the town of Ukpor in Anambra State, Nigeria have been studied.

Journal ArticleDOI
TL;DR: Martinique constitutes an island of the active volcanic arc of the “Petites Antilles” and is situated at the divergent point between the old and recent arcs as discussed by the authors.


Journal ArticleDOI
TL;DR: The mechanism of adsorption of the herbicide Isoxaben on montmorillonite homoionic to H, Al, Ca and Na has been studied in this paper.