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
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 treatment with D2O vapour and this has
allowed the OH...
The origin and formation of clay minerals in soils: past, present and future perspectives
Clay Minerals - Tập 34 Số 1 - Trang 7-25 - 1999
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 considered in the
light of selected ...
Magnetite in soils: I. The synthesis of single-domain and superparamagnetic magnetite
Clay Minerals - Tập 22 Số 4 - Trang 411-422 - 1986
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 synthetic
products were found to range in size between 0·01–0·07µm (mean diameter) and
hence span t...
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
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 mixture whereas the amplitude, which follows the
sequence DIOX > THP > THF, is...
Chemically modified smectites
Clay Minerals - Tập 38 Số 1 - Trang 127-138 - 2003
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 particles. More severe
modificati...
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
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 claystones and mudstones
have distinctly...
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
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 splitting are at lower
frequencies ...
Halloysite nanotubes as a new drug-delivery system: a review
Clay Minerals - Tập 51 Số 3 - Trang 469-477 - 2016
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 clay mineral similar to
kaolin, poss...
The adsorption of aliphatic alcohols by montmorillonite and kaolinite
Clay Minerals - Tập 8 Số 2 - Trang 213-227 - 1969
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
soluble alcoh...
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