Cambridge University Press (CUP)
2640-9364
2993-6780
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Các bài báo tiêu biểu
Iron Oxide Removal from Soils and Clays by a Dithionite-Citrate System Buffered with Sodium BicarbonateAbstract The oxidation potential of dithionite (Na2 S2 O4 ) increases from 0.37 V to 0.73 V with increase in pH from 6 to 9, because hydroxyl is consumed during oxidation of dithionite. At the same time the amount of iron oxide dissolved in 15 minutes falls off (from 100 percent to less than 1 percent extra... ...
Tập 7 - Trang 317-327 - 1958
Rapid Dissolution of Allophane and Kaolinite-Halloysite After DehydrationAbstract Differential dissolution in NaOH solution was investigated as a means of purification of clay. It was discovered that a large quantity of allophane and free alumina and silica were dissolved from clay preparations in 0.5 N NaOH solution by boiling for as little as 2.5 min, provided the ratio of clay weight to solution volume was kept less than 100 mg to 100... ...
- 1958
Sepiolite and Related Compounds: Its Stability and ApplicationAbstract The unit-cell characteristics and structures of sepiolite, ferri-sepiolites (xylotile, mountain wood, gunnbjarnite), loughlinite and palygorskite (attapulgite) and their structural relationships are discussed. The chemical, morphological and thermal properties are explained by their structures. The unit-cell characteristics and structures of sepiolite “anhy... ...
- 1961
Differential Settling Tendencies of Clay Minerals in Saline WatersAbstract Differential settling velocities of individual clay mineral types and clay mineral mixtures in quiet saline water are reported for ocean water chlorinity range 0–18‰, brackish water ionic strength range 0.0–0.686 moles-(unit charge)2 /kg, temperature range 6–26°C, clay mineral concentration range 0.01–3.6 g/1., and pH range 6.5–9.8. The ... ...
Tập 7 - Trang 1-79 - 1958
The Mechanism of Dehydration of Mg-VermiculiteAbstract The hydrated Mg-vermiculite lattice contains double sheets of water molecules interleaved with silicate layers. In the fully hydrated condition, each water sheet is arranged in a regular hexagonal pattern and the interlayer cations are located midway between water sheets in octahedral coordination. Release of water molecules from interlayer ... ...
- 1955
Transformation of Clay Minerals by Calcium Hydroxide AttackAbstract Calcium hydroxide was allowed to react with various clays, other silicates, and quartz at slightly elevated temperatures for several months. The reaction products were examined by X-ray diffraction, DTA, and electron microscopy, and were shown to be poorly-crystallized calcium silicate hydrates of the tobermorite family, and calcium aluminate hydrates. Quat... ...
Tập 12 - Trang 359-379 - 1963
Orientation and Packing of Aliphatic Chain Molecules on MontmorilloniteAbstract Aliphatic chain molecules may be adsorbed on montmorillonite surfaces with the zigzag of their carbon chain either parallel or perpendicular to the surface. These orientations are designated α II and α I , respectively. Fourier syntheses have too few terms to distin... ...
Tập 9 - Trang 546-556 - 1960
Adjustment of Clays to Chemical Change and the Concept of the Equivalence LevelAbstract Further x-ray and chemical work on suspended sediment samples and cored samples from the James River and its estuary support earlier proposals by the author. A chlorite-like clay is forming from weathered illite through a mixed-layer illite—vermiculite-chlorite stage, and some illite is seemingly regenerated to a better illite by potassium fixation....
Tập 6 - Trang 309-326 - 1957
The Distribution and Identification of Mixed-Layer Clays in Sedimentary Rocks
Tập 4 - Trang 385-386 - 1955
Shear Strength of Montmorillonite and Kaolinite Related to Interparticle ForcesAbstract Shear strength of saturated, remolded clay mineral samples was measured in an attempt to relate strength to forces acting between clay particles. The fine fractions of the clays, purified when necessary, were consolidated to different void ratios and subjected to quick, translatory shear in a direct shear device. Relative values for shear strength were obta... ...
Tập 9 - Trang 210-218 - 1960