Clay Minerals

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Infrared spectroscopy of ferrihydrite: evidence for the presence of structural hydroxyl groups
Clay Minerals - Tập 14 Số 2 - Trang 109-114 - 1979
James Russell
AbstractIR spectroscopy has shown that adsorbed water is almost completely removed from ferrihydrite by evacuation at room temperature. Absorption bands at 3615 and 3430 cm−1 appearing thereafter are interpreted as arising from OH groups located respectively at the surface and deeper in the structure. These groups are readily converted to OD on...... hiện toàn bộ
The origin and formation of clay minerals in soils: past, present and future perspectives
Clay Minerals - Tập 34 Số 1 - Trang 7-25 - 1999
M. J. Wilson
AbstractThe origin and formation of soil clay minerals, namely micas, vermiculites, smectites, chlorites and interlayered minerals, interstratified minerals and kaolin minerals, are broadly reviewed in the context of research over the past half century. In particular, the pioneer overviews of Millot, Pedro and Duchaufour in France and of Jackson in the USA, are con...... hiện toàn bộ
Magnetite in soils: I. The synthesis of single-domain and superparamagnetic magnetite
Clay Minerals - Tập 22 Số 4 - Trang 411-422 - 1986
R. M. Taylor, Barbara A. Maher, Peter Self
AbstractA series of experiments has been carried out to investigate the possible formation of magnetite, Fe3O4, under ambient soil-forming conditions. Rapid and easy synthesis of magnetite was achieved through controlled oxidation of Fe2+solutions at room temperatures and near neutral pH values. The syn...... hiện toàn bộ
The adsorption of 1,4-dioxan, tetrahydrofuran and tetrahydropyran from binary solution with methanol on Al3+ and Cr3+-exchanged montmorillonite
Clay Minerals - Tập 22 Số 2 - Trang 199-205 - 1987
C. Breen, A. T. Deane
AbstractSurface excess isotherms were determined for the adsorption of 1,4-dioxan (DIOX), tetrahydropyran (THP) and tetrahydrofuran (THF) from binary solution with methanol (MeOH) on Al3+- and Cr3+-exchanged, montmorillonite containing different amounts of pre-adsorbed water. The isotherm type is dominated by the binary mix...... hiện toàn bộ
Chemically modified smectites
Clay Minerals - Tập 38 Số 1 - Trang 127-138 - 2003
Peter Komadel
AbstractThis paper summarizes recent results obtained on chemical modifications of smectites. These include replacement of exchangeable cations with protons, a process connected with smectite autotransformation – attack of protons on the layers and liberation of central atoms from the octahedral and tetrahedral sheets, causing modification of the acid sites on the ...... hiện toàn bộ
Palaeoclimate, palaeosalinity and redox conditions control palygorskite claystone formation: an example from the Yangtaiwatan Basin, northwest China
Clay Minerals - Tập 56 Số 3 - Trang 210-221 - 2021
Lihui Liu, Shuai Zhang, Qinfu Liu, Linsong Liu, Youjun Deng
AbstractPalygorskite-bearing claystones and mudstones were deposited in a salt lake in the middle and lower parts of the Neogene Baiyanghe Formation in the Yangtaiwatan Basin, China. The petrological, mineralogical and geochemical characteristics of the sediments were investigated to determine the factors controlling palygorskite formation. The palygorskite claysto...... hiện toàn bộ
Infrared study of goethites of varying crystallinity and particle size: I. Interpretation of OH and lattice vibration frequencies
Clay Minerals - Tập 21 Số 2 - Trang 191-200 - 1986
Philippe Cambier
AbstractA detailed study of the IR spectrum of goethite is given with the aim of relating variations to crystalline order and particle size. The OH stretching vibrations are split into two active components at high frequency, plus two inactive ones at low frequency. Two different bending modes exist from site group splitting. Their active modes from factor group sp...... hiện toàn bộ
Halloysite nanotubes as a new drug-delivery system: a review
Clay Minerals - Tập 51 Số 3 - Trang 469-477 - 2016
Muhammad Hanif, Fazila Jabbar, Sana Sharif, Ghulam Abbas, Athar Farooq, Mubashir Aziz
AbstractNew drug-delivery systems have remained a challenge for pharmaceutical scientists due to the use of expensive polymers and the low loading capacity of prepared nanoparticles. There is pressure to develop formulations that contain not only cheaper materials but also have controlled-release properties. Halloysite nanotubes (HNTs) are a naturally occurring cla...... hiện toàn bộ
Kaolin and halloysite deposits of China
Clay Minerals - Tập 39 Số 1 - Trang 1-15 - 2004
Ian Wilson
The adsorption of aliphatic alcohols by montmorillonite and kaolinite
Clay Minerals - Tập 8 Số 2 - Trang 213-227 - 1969
William L. German, David A. Harding
Adsorption isotherms for an homologous series of primary aliphatic alcohols from aqueous solution by montmorillonite and kaolinite saturated with either sodium or calcium ions have been determined. The results show that adsorption is a function of chain length and exchangeable cation in the case of the more insoluble alcohols. Exchangeable cation does not affect the adsorption of the solub...... hiện toàn bộ
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