Results 201 to 210 of about 18,367 (247)
Some of the next articles are maybe not open access.
Interstratified kaolinite-smectite: Nature of the layers and mechanism of smectite kaolinization
American Mineralogist, 2006This study aims to contribute to a better understanding of the nature and evolution mechanism of interstratified clay minerals. We examined the
Dudek T, Cuadros J, Fiore S
openaire +3 more sources
Atrazine Desorption from Smectites
Soil Science Society of America Journal, 1994Abstract In soils low in organic matter, pesticide adsorption and desorption by clay minerals may strongly influence the fate of pesticides in soil environments. Atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐1,3,5‐triazine) adsorption‐desorption was determined on 11 reference smectites (<2‐µm size fraction), and a soil smectite (
Barriuso, E. +3 more
openaire +2 more sources
The variable charge of dioctahedral smectites
Journal of Colloid and Interface Science, 2013One of the most important properties of smectites is the cation exchange capacity resulting both from the structural permanent charge and the pH depending variable charge. The variable charge, in turn, mainly results from the edge aluminol groups (in the case of dioctahedral smectites).
S, Kaufhold, R, Dohrmann
openaire +2 more sources
Weathering of smectite and illite-smectite under temperate climatic conditions
Clay Minerals, 2001International ...
Srodon, J. +5 more
openaire +3 more sources
Characterization of smectites synthesised from zeolites and mechanism of smectite synthesis
Clay Minerals, 1985AbstractSmectites were synthesised hydrothermally from zeolites in an Mg-rich brine at 300°C under a confining pressure of 30 MPa and characterized by XRD using the Greene-Kelley Li-saturation test and the K+-saturation/glycolation test. The synthetic smectites were found to be dioctahedral with only tetrahedral negative layer charge; the layer charge ...
S. Komarneni, E. Breval
openaire +1 more source
Phase relations among smectite, R1 illite-smectite, and illite
American Mineralogist, 1997A variety of smectitic and illitic clays were studied by TEM and AEM, following ex- pansion by L.R. White resin, to define phase relations for clay minerals undergoing di- genesis and low-grade metamorphism. Samples included a prograde shale sequence from the Gulf Coast, a hydrothermal bentonite from Zempleni, Hungary, and shales from the Nankai Trough,
Hailiang Dong +2 more
openaire +1 more source
Applied Clay Science, 2009
Abstract To evaluate the influence of coexistent salt in the Mg–Si precursor for the hydrothermal synthesis of smectite, stevensite was synthesized hydrothermally from Mg–Si precursors with different salt concentrations. Prepared homogeneous Mg–Si precursors were washed with distilled water before hydrothermal treatment. The salt concentration of the
Hyun-Jeong Nam +4 more
openaire +1 more source
Abstract To evaluate the influence of coexistent salt in the Mg–Si precursor for the hydrothermal synthesis of smectite, stevensite was synthesized hydrothermally from Mg–Si precursors with different salt concentrations. Prepared homogeneous Mg–Si precursors were washed with distilled water before hydrothermal treatment. The salt concentration of the
Hyun-Jeong Nam +4 more
openaire +1 more source
Pathways of Smectite Illitization
Clays and Clay Minerals, 1986AbstractJunction probability diagrams show variation in both composition and layer arrangement in mixed-layer clay minerals. These diagrams can represent short-range and long-range ordered, random, and segregated interstratifications. Mineralogical analyses of illite/smectite from shale cuttings, bentonites, and hydrothermally altered tuffs define ...
Craig M. Bethke +2 more
openaire +1 more source
Expansion of Smectite by Hexadecyltrimethylammonium
Clays and Clay Minerals, 2002AbstractThe adsorption of hexadecyltrimethylammonium (HDTMA) in smectite was studied by adsorption isotherms, X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Smectites that had reacted for 48 h with HDTMA cations equivalent to 0.2–3.0 times the cation exchange capacity (CEC) were converted to HDTMA-exchanged ...
Seung Yeop Lee, Soo Jin Kim
openaire +1 more source
Acrylonitrile-smectite complexes
Clay Minerals, 1991AbstractThe adsorption of acrylonitrile (AN) monomer vapour in the interlamellar space of smectites exchanged with different cations (Na or Y or hexylammonium) was monitored and used to yield macromolecular layers. Polymerization in the presence or absence of a free-radical initiator was obtained by heating at 100°C for 72 h. Cyclization can already be
F. Bergaya, F. Kooli
openaire +1 more source