Layer-structured uranyl-oxide hydroxy-hydrates with Pr(iii) and Tb(iii) ions: hydroxyl to oxo transition driven by interlayer cations

2020 ◽  
Vol 49 (18) ◽  
pp. 5832-5841 ◽  
Author(s):  
Kimbal Thane Lu ◽  
Yingjie Zhang ◽  
Tao Wei ◽  
Jiří Čejka ◽  
Rongkun Zheng
Keyword(s):  
Interlayer Cations

Two new uranyl-oxide hydroxy-hydrate phases with Pr(iii)/Tb(iii) ions have been synthesized hydrothermally and structurally characterized.

ChemInform Abstract: The Effect of Interlayer Cations on the Magnetic Properties of the Mixed-Metal Pnictide Oxides: A2MnZn2As2O2 (A: Sr, Ba).

ChemInform ◽  
2010 ◽  
Vol 32 (28) ◽  
pp. no-no
Author(s):  
Tadashi C. Ozawa ◽  
Susan M. Kauzlarich ◽  
Mario Bieringer ◽  
Chris R. Wiebe ◽  
John E. Greedan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Interlayer Cations ◽  
Mixed Metal

Correlation of exfoliation performance with interlayer cations of montmorillonite in the preparation of two‐dimensional nanosheets

2019 ◽  
Vol 102 (7) ◽  
pp. 3908-3922 ◽  
Author(s):  
Haoyu Bai ◽  
Yunliang Zhao ◽  
Xian Zhang ◽  
Wei Wang ◽  
Tingting Zhang ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Interlayer Cations

Determination of the Driving Force for the Hydration of the Swelling Clays from Computation of the Hydration Energy of the Interlayer Cations and the Clay Layer

2007 ◽  
Vol 111 (35) ◽  
pp. 13170-13176 ◽  
Author(s):  
Fabrice Salles ◽  
Olivier Bildstein ◽  
Jean-Marc Douillard ◽  
Michel Jullien ◽  
Henri Van Damme
Keyword(s):  
Driving Force ◽  
Hydration Energy ◽  
Clay Layer ◽  
Interlayer Cations ◽  
Swelling Clays

Dehydration of the montmorillonite minerals

1955 ◽  
Vol 30 (228) ◽  
pp. 604-615 ◽  
Author(s):  
R. Greene-Kelly
Keyword(s):  
Charge Density ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
The Other ◽  
Hydration Energy ◽  
Interlayer Cations ◽  
Potassium Fixation ◽  
Exchange Cations ◽  
Silicate Layers

Studies of the effect of dehydration at temperatures greater than 150° on sorption by montmorillonites have shown that small interlayer cations such as lithium and magnesium promote an irreversible decrease in the amount of interlamellar sorption and a consequent marked fall in the cation exchange capacity as measured by conventional methods (1, 2, 3, 4). The other minerals of the group do not show this property (4), which is quite distinct from the supposed 'potassium fixation' reported in these minerals (5). This latter effect, which is small for montmorillonite, refers to the decreased rate of exchange of potassium as compared with smaller exchange cations especially after the potassium-saturated mineral has been dried at ]00° C., and has been shown to be much more marked in mica-like minerals with silicate layers of higher charge density (e.g. illites and vermiculites (6)). The amount of water sorbed by potassium-saturated montmorillonite is not significantly affected by drying at temperatures below 400° C. although it is less than that of most other montmorilIonites (3), due probably to the low hydration energy of the potassium ion (7).

scholarly journals Mineralogy, Mineral Chemistry and SWIR Spectral Reflectance of Chlorite and White Mica

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 471
Author(s):  
Jonathan Cloutier ◽  
Stephen J. Piercey ◽  
Jonathan Huntington
Keyword(s):  
Low Cost ◽  
Spectral Response ◽  
Mineral Chemistry ◽  
White Mica ◽  
Spectral Studies ◽  
Spectral Signature ◽  
Absorption Feature ◽  
Chemical Information ◽  
Interlayer Cations ◽  
Spectral Interpretation

Hyperspectral reflectance has the potential to provide rapid and low-cost mineralogical and chemical information that can be used to vector in mineral systems. However, the spectral signature of white mica and chlorite, despite numerous studies, is not fully understood. In this study, we review the mineralogy and chemistry of different white mica and chlorite types and investigate what mineralogical and chemical changes are responsible for the apparent shifts in the shortwave infrared (SWIR) spectroscopic absorption features. We demonstrate that the spectral signature of white mica is more complex than previously documented and is influenced by the Tschermak substitution, as well as the sum of interlayer cations. We show that an increase in the interlayer deficiencies towards illite is associated with a change from steep to shallow slopes between the wavelength position of the 2200 nm feature (2200 W) and Mg, Al(VI) and Si. These changes in slope imply that white micas with different elemental chemistry may be associated with the same 2200 W values and vice versa, contrary to traditional interpretation. We recommend that traditional interpretations should only be used in true white mica with sum interlayer cations (I) > 0.95. The spectral signature of trioctahedral chlorite (clinochlore, sheridanite, chamosite and ripidolite) record similar spectral relationships to those observed in previous studies. However, dioctahedral Al-rich chlorite (sudoite, cookeite and donbassite) has a different spectral response with Mg increasing with 2250 W, which is the opposite of traditional trioctahedral chlorite spectral interpretation. In addition, it was shown that dioctahedral chlorite has a 2200 W absorption feature that may introduce erroneous spectral interpretations of white mica and chlorite mixtures. Therefore, care should be used when interpreting the spectral signature of chlorite. We recommend that spectral studies should be complemented with electron microprobe analyses on a subset of at least 30 samples to identify the type of muscovite and chlorite. This will allow the sum I of white mica to be obtained, as well as estimate the slope of 2200 W absorption trends with Mg, Al(vi), and Si. Preliminary probe data will allow more accurate spectral interpretations and allow the user to understand the limitations in their hyperspectral datasets.

Clay swelling inhibition mechanism of α,ω-diaminoalkanes in Portland Brownstone

2009 ◽  
Vol 24 (5) ◽  
pp. 1646-1652 ◽  
Author(s):  
Timothy Wangler ◽  
George W. Scherer
Keyword(s):  
Inhibition Mechanism ◽  
Potential Treatment ◽  
X Ray Diffraction ◽  
Interlayer Cations ◽  
X Ray ◽  
Clay Swelling ◽  
Ethylenediamine Complex ◽  
Swelling Strain

Many clay-bearing sedimentary stones such as Portland Brownstone will swell when exposed to water, and this can generate damaging stresses as differential strains evolve during a wetting cycle. Current swelling inhibitors, consisting of α,ω-diaminoalkanes, can reduce swelling in Portland Brownstone up to 50%. In this study, through x-ray diffraction and swelling strain experiments, we demonstrate that the α,ω-diaminoalkanes inhibit swelling by substituting for interlayer cations and partially hydrophobicizing the interlayer, then rehydrating on subsequent wetting cycles. We also introduce the copper (II) ethylenediamine complex as a potential treatment for swelling inhibition.

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