The antibacterial activity of silver and cationic surfactant modified smectites from North Patagonian, Argentina, were tested in growth inhibition of Escherichia coli bacteria by the test of susceptibility on solid medium. The exchange reactions were carried out using Ag and hexadecyltrimethylammonium (HDTMA) cations in larger amounts than those conventionally required to form monolayer on the ...

This study investigates the feasibility of using ethylene oxide (EO) chain adsorption to determine the surface area of smectite in water. Experimental results indicate that high-molecular-weight poly(ethylene oxide) (PEO) should be used to provide reasonable estimations for monolayer capacity of PEO on smectite. The surface areas of smectites in water are calculated from the monolayer capacity ...

Solid-state intercalation was applied to prepare organo-smectites using cationic surfactants and natural clays containing smectite at various surfactant/smectite ratios. The enter the interlayers of smectites causing a swelling clays. used were collected in Siétougou Diabari villages located eastern part Burkina Faso. solid-state successful for all four applied, n-dodecyltrimethylammonium bromi...

A mineralogical characterization of a group bentonite samples was done by X-ray diffraction (XRD), chemical analysis inductively coupled plasma mass spectroscopy (ICP-MS), and visible-near infrared short-wave (VNIR-SWIR). As tested XRD, all are very pure, composed mainly smectites with small amounts impurities, such as quartz feldspar. The results the show high contents Al2O3 in except for COU(...

-Inverse gas chromatography at infinite dilution, employing alkanes and alkenes as probes, has been used to characterize the surface properties of a series of smectites of varying chemical composition. The results of this study show that the acidic centers and the interlayer distances have a great influence on the specific interaction of the smectite surface with ~r-bonds of alkenes. High value...

Carbonaceous chondrites contain both soluble and insoluble organic materials (SOM IOM) which may have been produced in different environments via processes or share possible genetic relationships. The SOM from IOM during hydrothermal episodes on asteroids, vice versa. potential role played by the mineral matrix these (clay minerals of variable crystallinity) remains to be constrained. Here, we ...