Surface modification of clay minerals has become increasingly important for optimizing the practical application of bentonites, kaolins, and clays. We describe the reaction of montmorillonite, an important mineral in bentonites, with cationic poly(ethylene oxides). Poly(ethylene oxides), PEOs, with molecular masses between 1550 and 35000, were modified by substituting the OH end groups by bromi...

As an important slurry material for water-based drilling fluids, montmorillonite has been widely used in oil because of its excellent properties such as expansibility, dispersion and suspension, making, cation exchange adsorption. However, at a certain temperature pressure, will transform into illite, chlorite other minerals, changing the fluids. In order to systematically summarize sort out cu...

Oximes were oxidized to the corresponding carbonyl compounds in good to high yields by ecofriendlyand green oxidant, H202 catalyzed by Montmorillonite K-10 supported Mangenese(II)Chloride. The structures of these compounds were favorably compared with the results of ab initiocalculations at three temperatures. Computational methods allow for the visualization of largeamounts of structural data ...

A biased Monte Carlo method for the insertion of water in dense clay–water systems is presented. The use of this algorithm results in a considerable increase of the success rate of insertion attempts. It allows us to compute water adsorption isotherms up to high water densities, where the conventional Monte Carlo scheme fails. The isotherms were calculated by a combination of molecular dynamics...

In this work we will report the formulation of novel 3-(pyridinylamino)-1-ferrocenylpropan-1-ones. A fruitful aza-Michael addition pyridinamine moiety to a conjugated enone, 1-ferrocenylpropenone, has been accomplished by an ultrasonic irradiation mixture these reactants. As catalyst montmorillonite K-10 used and reaction carried out as solvent-free, yielding ferrocene containing Mannich bases,...

background:  ramsar, a northern city in iran, lies on the coast of the caspian sea. this city has areas with some of the highest levels of natural radiation measured to date. the radon concentration in some areas of ramsar is up to 3700 bq m–3. on the other hand, due to high level of humidity, damp-proof barriers should be used in construction of new buildings in radon prone areas of this city....

Intercalation products based on ionic exchange reaction between cationic dye methylene blue and Na-montmorillonite were prepared. Montmorillonite particles intercalated with methylene blue were characterized using X-ray diffraction, infrared spectroscopy, elemental and thermo-gravimetric analysis. The results showed that intercalation of dye molecules within the interlayer spaces of montmorillo...