Cambridge University Press (CUP)
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Quantification of Mixed-Layer Clays in Multiple Saturation States Using NEWMOD2: Implications for the Potassium Uplift Hypothesis in the SE United States
Cambridge University Press (CUP) - Tập 68 - Trang 67-80 - 2020
Quantification of mineral assemblages in near-surface Earth materials is a challenge because of the often abundant and highly variable crystalline and chemical nature of discrete clay minerals. Further adding to this challenge is the occurrence of mixed-layer clay minerals, which is complicated because of the numerous possible combinations of clay layer types, as defined by their relative proporti...... hiện toàn bộ
A Compact Representation for Atomic Scattering Factors
Cambridge University Press (CUP) - Tập 21 - Trang 489-490 - 1973
Separation of Isomers of Cobalt(III) Complexes by Liquid Chromatography on a Column Packed with a Clay-Ruthenium(II) Complex Adduct
Cambridge University Press (CUP) - Tập 40 - Trang 359-361 - 1992
Acid-Base Interactions and the Properties of Kaolinite in Non-Aqueous Media
Cambridge University Press (CUP) - Tập 20 - Trang 135-141 - 1972
In non-aqueous systems, kaolinite can show, in addition to the physical interactions, considerable chemical activity. This study considers the chemical reactions that can occur at the kaolinite surface and explains these reactions in terms of acid-base interactions. In certain applications the chemical activity must be controlled if satisfactory products are to be obtained; for example, when kaoli...... hiện toàn bộ
Syntheses of Disordered and Al-Rich Hydrotalcite-Like Compounds
Cambridge University Press (CUP) - Tập 34 - Trang 507-510 - 1986
Hydrotalcite-like compounds, [Mg1-xAlx(OH)2]x+ [xX−·n H2O], where X− = ½CO32− or OH−, were prepared by hydrothermal syntheses at
$$P_{H{_2}O}=100\;MPa$$
and T = 100°–350°C. Starting materials were MgO, γ-Al2O3, H2O, and MgC2O4·2H2O. The synthesis...... hiện toàn bộ
Effects of Freezing on Colloidal Halloysite: Implications for Temperate Soils
Cambridge University Press (CUP) - Tập 39 - Trang 642-650 - 1991
The literature reports that freezing of aqueous aluminosilicate clay suspensions can produce clay aggregates that disperse with agitation. Our experiments indicate that colloidal suspensions extracted from north Idaho loess soils (Boralfs), when frozen, form silt- and sand-sized agglomerates that resist dispersion with agitation. XRD and TEM analyses showed that colloids are dominantly halloysite ...... hiện toàn bộ
Effect of Sonication on Particle-Size Distribution in Natural Muscovite and Biotite
Cambridge University Press (CUP) - Tập 51 - Trang 701-708 - 2003
The effects of ultrasound treatment on the mean particle size, crystal structure, crystallite dimensions and specific surface area of natural muscovite and biotite samples have been investigated. Sonication of macroscopic flakes of muscovite and biotite produced a drastic particle-size reduction. The conditions for the preparation of micron and submicron-sized muscovite and biotite particles of na...... hiện toàn bộ
Assessment of Pedogenic Gibbsite as a Paleo-PCO2 Proxy Using a Modern Ultisol
Cambridge University Press (CUP) - Tập 62 - Trang 253-266 - 2014
The stable carbon isotope composition of CO2 occluded in the gibbsite structure is proposed as a potential atmospheric paleo-PCO2 proxy. Analysis of pedogenic gibbsite from a modern Ultisol in the Piedmont of Georgia, USA, was conducted to test the basis for this concept and to help constrain the parameters used to describe physical and biological processes affecting such factors as the respiratio...... hiện toàn bộ
Microscopy Studies of the Palygorskite-to-Smectite Transformation
Cambridge University Press (CUP) - Tập 53 - Trang 92-99 - 2005
The transformation process between palygorskite and smectite was studied by examining the morphological and structural relationships between these two minerals in an assemblage from the Meigs Member of the Hawthorne Formation, southern Georgia. Studied samples were related to an alteration horizon with a tan clay unit above and a blue clay unit below. Atomic force microscopy (AFM) and transmission...... hiện toàn bộ
Natural Occurrence of Feroxyhite (δ′-FeOOH)
Cambridge University Press (CUP) - Tập 28 Số 4 - Trang 272-280 - 1980
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