scholarly journals Significance of Fracture-Filling Rose-Like Calcite Crystal Clusters in the SE Pyrenees

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 522
Author(s):  
David Cruset ◽  
Jordi Ibáñez-Insa ◽  
Irene Cantarero ◽  
Cédric M. John ◽  
Anna Travé
Keyword(s):  
Fluid Inclusions ◽  
Aromatic Hydrocarbons ◽  
Major Elements ◽  
Clumped Isotopes ◽  
X Ray Diffraction ◽  
Calcite Crystal ◽  
Fresh Groundwater ◽  
Raman Analysis ◽  
X Ray ◽  
Co2 Release

Fracture-filling rose-like clusters of bladed calcite crystals are found in the northern sector of the Cadí thrust sheet (SE Pyrenees). This unusual calcite crystal morphology has been characterized by using optical and electron microscope, X-ray diffraction, Raman spectroscopy, δ18O, δ13C, 87Sr/86Sr, clumped isotopes, and major and rare earth elements + yttrium (REEs + Y) analysis. Petrographic observations and powder X-ray diffraction measurements indicate that these bladed crystals are mainly made of massive rhombic crystals with the conventional (104) faces, as well as of possibly younger, less abundant, and smaller laminar crystals displaying (108) and/or ( 1 ¯ 08) rhombic faces. Raman analysis of liquid fluid inclusions indicates the presence of aromatic hydrocarbons and occasionally alkanes. Clumped isotopes thermometry reflects that bladed calcite precipitated from meteoric fluids at ~60–65 °C. The 87Sr/86Sr ratios and major elements and REEs content of calcite indicate that these fluids interacted with Eocene marine carbonates. The presence of younger ‘nailhead’ calcite indicates later migration of shallow fresh groundwater. The results reveal that rose-like calcite clusters precipitated, at least in the studied area, due to a CO2 release by boiling of meteoric waters that mixed with benzene and aromatic hydrocarbons. This mixing decreased the boiling temperature at ~60–65 °C. The results also suggest that the high Sr content in calcite, and probably the presence of proteins within hydrocarbons trapped in fluid inclusions, controlled the precipitation of bladed crystals with (104) rhombohedral faces.

Characterization and A Preliminary Study of TiO2 Synthesis from Lampung Iron Sand

2020 ◽  
Vol 849 ◽  
pp. 113-118
Author(s):  
Yayat Iman Supriyatna ◽  
Slamet Sumardi ◽  
Widi Astuti ◽  
Athessia N. Nainggolan ◽  
Ajeng W. Ismail ◽  
...  
Keyword(s):  
Food Packaging ◽  
Xrd Analysis ◽  
Major Elements ◽  
Raw Material ◽  
Solid Residue ◽  
X Ray Diffraction ◽  
X Ray ◽  
Leaching Solution ◽  
Ti Content

The purpose of this study is to characterize Lampung iron sand and to conduct preliminary experiments on the TiO2 synthesis which can be used for the manufacturing of functional food packaging. The iron sand from South Lampung Regency, Lampung Province that will be utilized as raw material. The experiment was initiated by sieving the iron sand on 80, 100, 150, 200 and 325 mesh sieves. Analysis using X-Ray Fluorescence (XRF) to determine the element content and X-Ray Diffraction (XRD) to observe the mineralization of the iron sand was conducted. The experiment was carried out through the stages of leaching, precipitation, and calcination. Roasting was applied firstly by putting the iron sand into the muffle furnace for 5 hours at a temperature of 700°C. Followed by leaching using HCl for 48 hours and heated at 105°C with a stirring speed of 300 rpm. The leaching solution was filtered with filtrate and solid residue as products. The solid residue was then leached using 10% H2O2 solution. The leached filtrate was heated at 105°C for 40 minutes resulting TiO2 precipitates (powder). Further, the powder was calcined and characterized. Characterization of raw material using XRF shows the major elements of Fe, Ti, Mg, Si, Al and Ca. The highest Ti content is found in mesh 200 with 9.6%, while iron content is about 80.7%. While from the XRD analysis, it shows five mineral types namely magnetite (Fe3O4), Rhodonite (Mn, Fe, Mg, Ca) SiO3, Quart (SiO2), Ilmenite (FeOTiO2) and Rutile (TiO2). The preliminary experiment showed that the Ti content in the synthesized TiO2 powder is 21.2%. The purity of TiO2 is low due to the presence of Fe metal which is dissolved during leaching, so that prior to precipitation purification is needed to remove impurities such as iron and other metals.

scholarly journals Activated Charcoal Supported Cadmium Doped TiO2 for Photocatalytic and Antibacterial Applications

2015 ◽  
Vol 44 ◽  
pp. 108-123 ◽  
Author(s):  
S. Prabha ◽  
V.L. Chandraboss ◽  
J. Kamalakannan ◽  
S. Senthilvelan
Keyword(s):  
Uv Light ◽  
Precipitation Method ◽  
Scanning Electron Micrographs ◽  
X Ray Diffraction ◽  
Raman Analysis ◽  
X Ray ◽  
Photo Catalytic Activity ◽  
Photocatalytic Effect ◽  
Fourier Transform Raman ◽  
Ft Raman

The photocatalytic activity was studied under UV light using AC-Cd/TiO2 prepared via precipitation method and characterized by powder X-ray diffraction (XRD) , high resolution scanning electron micrographs (HR-SEM) with energy dispersive X-ray analysis (EDX), photoluminescence (PL) and Fourier transform Raman analysis (FT-RAMAN). The enhanced photo catalytic activity of the AC-Cd/TiO2 is demonstrated through photodegradation of methylene blue under UV light radiation at 365 nm. The mechanism of photocatalytic effect of AC-Cd/TiO2 nanocomposite material has been discussed Further its antibacterial activity against two gram positive and two gram negative bacterial strain is studied.

Effect of Crystal Orientation Agents on Morphology of Nano-CaCO3

2015 ◽  
Vol 723 ◽  
pp. 544-547
Author(s):  
Xiang Wei Cheng ◽  
Da Jin Xiong ◽  
Chao Huo
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Crystal Orientation ◽  
Average Particle ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
Calcite Crystal ◽  
X Ray ◽  
Different Shapes ◽  
Scanning Electron

Using intermittent bubbling carbonation method to prepare nanoCaCO3, the effect of crystal orientation agents on the morphology of nanoCaCO3 was studied. The nanoCaCO3 was characterized by means of field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), Laser particle analyzer. The results showed that the different shapes nanoCaCO3 was synthesized by adding different crystal orientation agents to control the shape of the product. The as-prepared CaCO3 were pure calcite crystal and the average particle sizes were within the range of 25.7 to 60.9 nm.

X-Ray Diffraction Patterns of Solid Aromatic Hydrocarbons

1951 ◽  
Vol 23 (5) ◽  
pp. 690-695 ◽  
Author(s):  
L. J. E. Hofer ◽  
W. C. Peebles
Keyword(s):  
Aromatic Hydrocarbons ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns

Poly(L-Lactide) Composite Nanofibers Incorporating POSS-MWNTs

2011 ◽  
Vol 175-176 ◽  
pp. 341-344 ◽  
Author(s):  
Byoung Suhk Kim ◽  
Kyu Oh Kim ◽  
Ick Soo Kim
Keyword(s):  
Composite Nanofibers ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
Raman Analysis ◽  
X Ray ◽  
Polyhedral Oligosilsesquioxane ◽  
Hybrid Nanofibers ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir

We report the electrospun poly(L-lactide) (PLA) nanofibers incorporating polyhedral oligosilsesquioxane (POSS)-modified multiwalled carbon nanotubes (MWNTs). FT-IR, transmission electron microscopy (TEM) and Raman analysis confirmed the existence of POSS macromers bonded to the MWNTs as an extra phase. The thermal and microstructure properties of the PLA hybrid nanofibers with POSS-modified MWNTs were investigated by thermogravimetric analysis (TGA) and Wide-angle X-ray diffraction (WAXD).

Study of pocyclic aromatic hydrocarbons at a pressure of 6–9 GPa with X-ray diffraction and synchrotron radiation

2014 ◽  
Vol 458 (2) ◽  
pp. 1277-1280 ◽  
Author(s):  
A. D. Chanyshev ◽  
K. D. Litasov ◽  
A. F. Shatskiy ◽  
E. Ohtani
Keyword(s):  
Synchrotron Radiation ◽  
Aromatic Hydrocarbons ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Supplemental Material: Temperatures of Late Cretaceous (Campanian) methane-derived authigenic carbonates from the Western Interior Seaway, South Dakota, USA, using clumped isotopes

2021 ◽  
Author(s):  
Yang Gao ◽  
et al.
Keyword(s):  
South Dakota ◽  
Late Cretaceous ◽  
Clumped Isotopes ◽  
Western Interior Seaway ◽  
X Ray Diffraction ◽  
Raw Data ◽  
Authigenic Carbonates ◽  
X Ray ◽  
Hand Sample

Raw data spreadsheet, scanned pictures of every analyzed hand sample, and Cathodoluminescence and X-ray diffraction images of selected samples.

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