A review of the classification of opal with reference to recent new localities
Our examination of over 230 worldwide opal samples shows that X-ray diffraction (XRD)
remains the best primary method for delineation and classification of opal-A, opal-CT and …
remains the best primary method for delineation and classification of opal-A, opal-CT and …
The structure of opal-CT revisited
MJ Wilson - Journal of Non-Crystalline Solids, 2014 - Elsevier
There is a conflict of evidence with regard to the structure of the silica polymorph known as
opal-CT. The current widely accepted interpretation of the structure views opal-CT as made …
opal-CT. The current widely accepted interpretation of the structure views opal-CT as made …
Controlled grafting synthesis of silica-supported boron for oxidative dehydrogenation catalysis
MC Cendejas, RW Dorn, WP McDermott… - The Journal of …, 2021 - ACS Publications
We present the controlled grafting synthesis of pinacolborane on amorphous silica. 11B
solid-state NMR and IR spectroscopies reveal that the precursor molecule anchors …
solid-state NMR and IR spectroscopies reveal that the precursor molecule anchors …
Mechanism of metal oxide nanoparticle loading in SBA-15 by the double solvent technique
J van Der Meer, I Bardez-Giboire… - The Journal of …, 2010 - ACS Publications
The interaction between SBA-15 mesoporous silica, alkane solvents, and water has been
studied to understand the mechanism of the so-called double solvent technique. This …
studied to understand the mechanism of the so-called double solvent technique. This …
Atomic structure and dehydration mechanism of amorphous silica: Insights from 29Si and 1H solid-state MAS NMR study of SiO2 nanoparticles
Detailed knowledge of the atomic structure of hydrous species on surface of amorphous
silica and the effect of temperature and particle size on their atomic configurations are …
silica and the effect of temperature and particle size on their atomic configurations are …
Siliceous sinters in thermal spring systems: Review of their mineralogy, diagenesis, and fabrics
B Jones - Sedimentary Geology, 2021 - Elsevier
This paper provides a comprehensive review of the sinter deposits, formed largely of opal-A,
that are form around hot springs and geysers throughout the world. The discharge aprons …
that are form around hot springs and geysers throughout the world. The discharge aprons …
Reexamination of the structure of opal-A: A combined study of synchrotron X-ray diffraction and pair distribution function analysis
The structure of opal-A was not fully understood due to its poorly crystalline nature. To better
understand its structural characteristics, we have analyzed opal-AN (amorphous-network) …
understand its structural characteristics, we have analyzed opal-AN (amorphous-network) …
Natural hydrous amorphous silica: Quantitation of network speciation and hydroxyl content by 29Si MAS NMR and vibrational spectroscopy
SM Chemtob, GR Rossman… - American …, 2012 - pubs.geoscienceworld.org
Natural and synthetic hydrous amorphous silicas were investigated with single-pulse 29Si
magic angle spinning (MAS) NMR and with vibrational spectroscopic methods. Samples …
magic angle spinning (MAS) NMR and with vibrational spectroscopic methods. Samples …
Preparation and crystal structure of RUB-18 modified for synthesis of zeolite RWR by topotactic conversion
T Ikeda, Y Oumi, T Takeoka, T Yokoyama… - Microporous and …, 2008 - Elsevier
The systematic study on the synthetic route of the siliceous zeolite RWR with a small 8-MR
straight channel by topotactic conversion of crystalline layered silicate RUB-18 was carried …
straight channel by topotactic conversion of crystalline layered silicate RUB-18 was carried …
Weathering of olivine under CO2 atmosphere: A Martian perspective
Recent analyses from the Curiosity rover at Yellowknife Bay (Gale crater, Mars) show
sedimentary rocks deposited in a lacustrine environment and containing smectite clays …
sedimentary rocks deposited in a lacustrine environment and containing smectite clays …