Turbostratic disorder, consisting in a disorder in which different layers have different rotations with respect to an axis, is commonly found in montmorillonite. The effect of this kind of disorder on diffraction profiles is significant and must be taken into account, especially in quantitative phase analysis. The effect of the turbostratic disorder in textured materials has never been investig...

The competitive adsorption of the cationic pesticide chlordimeform and the heavy metal zinc on montmorillonite was studied. For different concentrations of Zn used, chlordimeform decreases (in relation to Zn-free treatments) when the pesticide is adsorbed simultaneously with the metal, but increases when Zn is adsorbed previously to chlordimeform. When comparing the Ko values chlordimeform is s...

-The conditions under which an exchanger phase will behave as an ideal mixture are established from thermodynamic principles. It is shown that, if a stoichiometric cation-exchange reaction is reversible, the exchanger phase will exhibit ideal behavior if the Vanselow selectivity coefficient is independent of the exchanger composition. This criterion is applied to some recently published data fo...

Bernal suggested that clays might have played a significant role in primitive earth through the process of concentration and adsorption of the biologically formed biomonomers and thus protecting them against hydrolytic fission.Adsorption of adenine was studied in presence of montmorillonite clay with or without cations Ca+,Cu+,Mg+.Studies carried out have shown that adsorption of adenine was de...

A novel heat-sealing performance is achieved by polyethylene (PE) nanocomposites reinforced by ethylene vinyl acetate (EVA) and montmorillonite (MMT). Appropriate nanocomposite design leads to hermetic seals with a general peelable/easy-open character across the broadest possible sealing temperature range. Observations of the fracture seal surfaces by infrared spectroscopy and electron microsco...

Bentonite is a mixture of clay and non-clay minerals. Montmorillonite mineral dominant in bentonite. Silica alumina bond the crystal structure montmorillonite. Therefore, they cannot contribute to pozzolanic reaction. Heat treatment bentonite leads destruction montmorillonite converting silica reactive phases. Thermally activated (TAB) relatively low pozzolan when used as partial replacement Po...

Mineral surfaces can support several processes that likely play a role in the origin of life including the concentration, selective sorption[1], protection[2], organization[3-5], and polymerization[6] of organic molecules. Clay minerals are predicted to be present in prebiotic environments and provide a large surface area for reactions with organic molecules. Interactions between early biomolec...

Bentonite with its unique structural properties is a valuable material for environmental application. Its sorption properties are usually improved by the different ways of modification. In this work, the special sedimentation method was used for the treatment of the natural bentonite to obtain monomineral fraction of montmorillonite. The modification by iron oxide particles was used with the ai...

Chemical activity diagraoas , prepared to illustrate the properties expected if mixed-layer montmorillonite/illite is regarded as a solid solution, are compared to those derived from a treatment of these materials as a mixture of two phases. If the system is a solid solution, the coexisting aqueous solution should range from higher dissolved silica contents in the presence of kaolinite and a mo...