Results 131 to 140 of about 10,713 (180)

Change in Layer Charge of Smectites and Smectite Layers in Illite/Smectite During Diagenetic Alteration

Clays and Clay Minerals, 1996
AbstractThe changes in amount and location of layer charge during diagenetic alteration have been investigated for smectites and smectite layers of illite/smectite interstratified minerals (I/S) by X-ray powder diffraction analysis with various expansion behavior tests: 1) ethylene glycol (EG) solvation (XRD); 2) K-saturation and EG solvation; 3) Li ...
Tsutomu Sato, Takashi Murakami, Takashi Watanabe   +2 more
openaire   +1 more source

Chemistry of Smectitic and Illitic Phases in Interstratified Soil Smectite

Soil Science Society of America Journal, 1991
Abstract The objective of this investigation was to determine the elemental composition and mineralogy of the smectitic and illitic phases in interstratified smectite‐illite from a typical upper Midwestern agricultural soil.
D. A. Laird, P. Barak, E. A. Nater, R. H. Dowdy   +3 more
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Complexation of carboxylate on smectite surfaces

Physical Chemistry Chemical Physics, 2017
We report a first principles molecular dynamics (FPMD) study of carboxylate complexation on clay surfaces.
Xiandong Liu, Xiancai Lu, Yingchun Zhang, Chi Zhang, Rucheng Wang   +4 more
openaire   +2 more sources

The variable charge of dioctahedral smectites

Journal of Colloid and Interface Science, 2013
One 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
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Weathering of smectite and illite-smectite under temperate climatic conditions

Clay Minerals, 2001
International ...
Srodon, J., Clauer, N., Elsass, Françoise, Eberl, D.D., Kraus, I., Madejova, J.   +5 more
openaire   +3 more sources

Characterization of smectites synthesised from zeolites and mechanism of smectite synthesis

Clay Minerals, 1985
AbstractSmectites 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, 1997
A 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, Donald R. Peacor, Robert L. Freed   +2 more
openaire   +1 more source

Sorption of Phenanthrene by Reference Smectites

Environmental Science & Technology, 2001
Fate and behavior of nonionic hydrophobic organic compounds (HOCs) in the environment is mainly controlled by their interactions with various components of soils and sediments. Due to their large surface area and abundance in many soils, smectites may greatly influence the fate and transport of HOCs in the environment.
L S, Hundal, M L, Thompson, D A, Laird, A M, Carmo   +3 more
openaire   +2 more sources

Atrazine Desorption from Smectites

Soil Science Society of America Journal, 1994
Abstract 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., Laird, D.A., Koskinen, W.C., Dowdy, R.H.   +3 more
openaire   +2 more sources

Interstratified kaolinite-smectite: Nature of the layers and mechanism of smectite kaolinization

American Mineralogist, 2006
This 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