نتایج جستجو برای: smectites
تعداد نتایج: 240 فیلتر نتایج به سال:
carbonates are among the most common soil constituents in arid and semiarid zones. they exhibit many significant differences in their chemical and mineralogical, suite, origin, physical and micromorphological properties and consequently in their activities in soil. the differences cause different properties of calcareous soils. six profiles of aridisols and inceptisols with carbonate accumulati...
Smectites or swelling clay minerals are naturally occurring nanomaterials that can be fully delaminated to elementary clay mineral platelets in dilute aqueous dispersion. This review article gives an overview of the recent progress on how the elementary clay mineral platelets can be reorganized in monolayered or multilayered hybrid nanofilms by layer-by-layer assembly or the Langmuir-Blodgett t...
Transport properties in shales were investigated using experimental and computersimulation methods. First, an experimental method based on a transient pressuredecay technique was further developed and used instead of classical Darcy core-flood methods. This has allowed measurement of the permeability of tight shale samples on much shorter time scales than by conventional methods. Second, molecu...
The layered structure of two smectites (montmorillonite and saponite) are modified by the insertion SiO2–ZrO2 nanoparticles, with a Si/Zr molar ratio 5, to form porous clay heterostructures (PCHs). These PCHs exhibit clear improvement textural acid properties in comparison starting clays, due formation pillared presence Zr species, which provide an increase amount Lewis sites. materials studied...
Stabilizing heavy metals in polluted soils is a method to prevent them from entering plants. Clay minerals are considered good sorbents for heavy metals due to their low cost, high abundance, easy manipulation and harmlessness to the environment. The objective of this study was to investigate the potential of clay deposits containing smectites and palygorskite to sorb cadmium and to reduce its ...
Introduction: Palagonitic tephra (basaltic tephra containing hydrated and hydroxylated volcanic glass of basaltic composition) has received widespread attention in the planetary literature because many are basaltic spectral and magnetic analogs of bright Martian surface materials [1, 2]. Here we present the H2O adsorption properties of two samples of palagonitic tephra (HWMK919, PA6-7) from the...
Sedimentary rocks at Yellowknife Bay (Gale crater) on Mars include mudstone sampled by the Curiosity rover. The samples, John Klein and Cumberland, contain detrital basaltic minerals, calcium sulfates, iron oxide or hydroxides, iron sulfides, amorphous material, and trioctahedral smectites. The John Klein smectite has basal spacing of ~10 angstroms, indicating little interlayer hydration. The C...
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