scholarly journals The Effects of Al2O3 and SiO2 on the Formation Process of Silico-Ferrite of Calcium and Aluminum (SFCA) by Solid-State Reactions

Minerals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 101
Author(s):  
Fei Liao ◽  
Xing-Min Guo
Keyword(s):  
Solid State Reactions ◽  
Orthorhombic Crystal ◽  
Initial Product ◽  
Triclinic Crystal System ◽  
Crystal System ◽  
Effect Mechanism ◽  
Iron Aluminum ◽  
High Basicity ◽  
Different Temperatures ◽  
Calcium Iron

The silico-ferrite of calcium and aluminum (SFCA) is a significant crystalline phase that bonds in high basicity sinter. Al2O3 and SiO2 play an important role in the formation of SFCA in the Fe2O3–CaO–SiO2–Al2O3 system, but the effect mechanism of Al2O3 and SiO2 on the formation of SFCA is unclear. To investigate this effect, sintering experiments were carried out with different temperatures and different times. It was found that the reaction of Al2O3 with CaFe2O4 (CF) as an initial product was easier to form during the calcium iron aluminum oxide (CFA) than that of SiO2 with CF to form SFC. This was due to the former directly forming to CFA while the latter initially formed Ca2SiO4 (C2S) and Ca2.5Fe15.5O25, and then SFC. It was also observed that when Al2O3 and SiO2 existed simultaneously, the Al2O3 initially reacted with CF to form CFA at 1100 °C, while the SiO2 participated in the formation of SFCA at 1150 °C without the formation of SFC. Moreover, it was understood that these were different effects in that the Al2O3 promoted the transformation from the orthorhombic crystal system to the triclinic crystal system, while the SiO2 dissolved into CFA to form the SFCA phase when Al2O3 existed.

scholarly journals Facile Synthesis, Microstructure, and Gas Sensing Properties of NdCoO3 Nanoparticles

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Lorenzo Gildo-Ortiz ◽  
Héctor Guillén-Bonilla ◽  
Juan Reyes-Gómez ◽  
Verónica María Rodríguez-Betancourtt ◽  
M. de la L. Olvera-Amador ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Cobalt Nitrate ◽  
Diffusional Growth ◽  
Orthorhombic Crystal ◽  
Cell Parameters ◽  
Standard Atmosphere ◽  
Sensing Applications ◽  
Water As Solvent ◽  
Different Temperatures ◽  
Precursor Powders

NdCoO3 nanoparticles were successfully synthesized by a simple, inexpensive, and reproducible solution method for gas sensing applications. Cobalt nitrate, neodymium nitrate, and ethylenediamine were used as precursors and distilled water as solvent. The solvent was evaporated later by means of noncontinuous microwave radiation at 290 W. The obtained precursor powders were calcined at 200, 500, 600, and 700°C in a standard atmosphere. The oxide crystallized in an orthorhombic crystal system with space group Pnma (62) and cell parameters a=5.33 Å, b=7.52 Å, and c=5.34 Å. The nanoparticles showed a diffusional growth to form a network-like structure and porous adsorption configuration. Pellets prepared from NdCoO3 were tested as gas sensors in atmospheres of carbon monoxide and propane at different temperatures. The oxide nanoparticles were clearly sensitive to changes in gas concentrations (0–300 ppm). The sensitivity increased with increasing concentration of the gases and operating temperatures (25, 100, 200, and 300°C).

scholarly journals Crystal Structure, Spectral Studies, and Hirshfeld Surfaces Analysis of 5-Methyl-5H-dibenzo[b,f]azepine and 5-(4-Methylbenzyl)-5H-dibenzo[b,f]azepine

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Madan Kumar Shankar ◽  
Basavapattana C. Manjunath ◽  
Koravangala Shivakumar Vinay Kumar ◽  
Kudigana J. Pampa ◽  
Marilinganadoddi P. Sadashiva ◽  
...  
Keyword(s):  
Diffraction Method ◽  
Spectral Studies ◽  
Boat Conformation ◽  
Orthorhombic Crystal System ◽  
Orthorhombic Crystal ◽  
Space Group ◽  
Cell Parameters ◽  
Crystal System ◽  
Hirshfeld Surfaces ◽  
Short Contacts

The compounds, 5-methyl-5H-dibenzo[b,f]azepine (1) and 5-(4-methylbenzyl)-5H-dibenzo[b,f]azepine (2), were synthesized and characterized by spectral studies, and finally confirmed by single crystal X-ray diffraction method. The compound 1 crystallizes in the orthorhombic crystal system in Pca21 space group, having cell parameters a=11.5681 (18) Å, b=11.8958 (18) Å, c=8.0342 (13) Å, and Z=4 and V=1105.6 (3) Å3. And the compound 2 crystallizes in the orthorhombic crystal system and space group Pbca, with cell parameters a=16.5858 (5) Å, b=8.4947 (2) Å, c=23.1733 (7) Å, and Z=8 and V=3264.92 (16) Å3. The azepine ring of both molecules 1 and 2 adopts boat conformation with nitrogen atom showing maximum deviations of 0.483 (2) Å and 0.5025 (10) Å, respectively. The C–H⋯π short contacts were observed. The dihedral angle between fused benzene rings to the azepine motif is 47.1 (2)° for compound 1 and 52.59 (6)° for compound 2, respectively. The short contacts were analyzed and Hirshfeld surfaces computational method for both molecules revealed that the major contribution is from C⋯H and H⋯H intercontacts.

Urinary Calculi

1958 ◽  
Vol 4 (4) ◽  
pp. 267-270 ◽  
Author(s):  
Henry O Nicholas ◽  
H F Leifeste
Keyword(s):  
Calcium Phosphate ◽  
Urinary Calculi ◽  
Ammonium Phosphate ◽  
Aluminum Silicate ◽  
Magnesium Ammonium Phosphate ◽  
Simple Method ◽  
Iron Aluminum ◽  
Magnesium Ammonium ◽  
Similar Survey ◽  
Calcium Iron

Abstract During the course of this investigation we have encountered two "fakes," both of which were represented by the patients to their respective physicians as having been "passed." They showed less than 2 per cent loss on ignition and proved to be calcium-iron-aluminum silicate rocks. We have also had about a dozen prostatic calculi which were analysed by the "ashing" method. This type of calculus consists of either a mixture of magnesium ammonium phosphate and calcium phosphate, or a mixture of calcium carbonate and calcium phosphate. The above-mentioned stones are, of course, not included in this picture. We hope that this survey and the simple method of analysis presented in these two articles will stimulate further work along this line in various parts of the country. The best similar survey we have seen is that of Leonard and Butt (1) on the types of calculi found in the Pensacola, Florida, area.

scholarly journals Characterization of Chitosan-Bentonite and Water Hyacinth Plant as a Potential Adsorbent

2018 ◽  
Vol 1 (1) ◽  
pp. 50
Author(s):  
Moondra Zubir ◽  
Hafni Indriati Nasution ◽  
Mutya Fika Safitri ◽  
Agustina Mandasari
Keyword(s):  
Water Hyacinth ◽  
Eichhornia Crassipes ◽  
Xrd Analysis ◽  
Silica Content ◽  
Triclinic Crystal System ◽  
X Ray ◽  
Crystal System ◽  
Infra Red ◽  
Ftir Spectrophotometry

Water hyacinth (Eichhornia crassipes) has a very rapid growth in the waters so it can cause eutrophication. The silica content of 5.56% allows water hyacinth can be utilized as a natural adsorbent. Bentonit has an advantage as an adsorbent because it has an inter-layered structure that can be easily modified with chitosan, resulting in better performance as an eco-friendly adsorbent. This research aims to determine the characterization of chitosan-bentonite and water hyacinth as a adsorbent of Pb(II)removal. Characterization tests were performed using X-ray difraction (XRD) and Fourier Transform Infra Red (FTIR) spectrophotometry. From the results of quantitative XRD analysis can be seen that the adsorbent of chitosan-bentonit and water hyacinth have different adsorbent characteristic, but has the same crystal system that is triclinic crystal system.

Hollow Hemisphere Shell Formation by Pure Kirkendall Porosity

2014 ◽  
Vol 1 ◽  
pp. 61-73 ◽  
Author(s):  
Csaba Cserháti ◽  
Györgyi Glodán ◽  
Dezső L. Beke
Keyword(s):  
Void Formation ◽  
Solid State Reactions ◽  
Average Composition ◽  
Transmission Electron ◽  
Straight Line ◽  
Theoretical Predictions ◽  
Different Temperatures ◽  
Increasing Temperature ◽  
Kinetics Of ◽  
Kirkendall Porosity

Nanoshell formation has been studied experimentally in Ag/Au and Ag/Pd systems in a hemispherical geometry at different temperatures. The void formation in these systems is the result ofpureKirkendall-porosity formation, because it is caused mainly by the inequality of the intrinsic atomic fluxes and other effects (e.g. stresses), inevitably present during nanoshell formations in solid state reactions (oxides, sulphides), can be less important or can be neglected. The kinetics of the process was followed by Transmission Electron Microscopy. Both the growth and shrinkage regimes of the process were observed at the same temperature and even the temperature dependence of the characteristic time (tcr) describing the crossover of the two different regimes was observed. We succeeded to show that tcrshifts to smaller values with increasing temperature. This confirms the theoretical results:the growth and the shrinkage regimes are controlled by the faster as well as the slower diffusion coefficients (DAas well as DB), respectively. It is also illustrated that, confirming recent theoretical predictions, the pore radius linearly depends on the initial particle radius and the slope of this straight line increases with the average composition of the faster component.

Effect of the Temperature on Diamond-Like Carbon (DLC) Thin Film Based on LIS

2013 ◽  
Vol 421 ◽  
pp. 212-216 ◽  
Author(s):  
Lei Huang ◽  
Jun Tang Yuan ◽  
Zhen Hua Wang ◽  
Bin Bin Yu
Keyword(s):  
Thin Films ◽  
Surface Roughness ◽  
Intensity Ratio ◽  
Failure Load ◽  
Ion Source ◽  
Diamond Like Carbon ◽  
Anode Layer ◽  
Effect Mechanism ◽  
Atomic Force ◽  
Different Temperatures

Diamond-like carbon (DLC) thin films were deposited on YG6 cemented carbide by an anode-layer linear ion source (LIS). The effect of different temperatures (20°C, 80°C, 115°C and 150°C) on DLC thin films was investigatedby using atomic force microscope (AFM), scanning electron microscope (SEM) and Raman spectroscopy. It was found thatthe surface roughness of the film decreased at first and then increased with the increase of the temperature, and reached the trough at 80°C. The intensity ratio (ID/IG) and the adhesion of the film increased at first and then decreased, and both of them reached the peak at 80°C. When the temperature was 80°C, the surface roughness was 6.9nm, the intensity ratio (ID/IG) was1.91 and the critical failure load was 107.23N. The results show that the temperatures have a great effect on the surface morphology and mechanism properties of DLC thin films. Consequently, this paperfurther studied the effect mechanism of different temperatures on DLC thin films based on the experiment.

scholarly journals Ni-Doped Protonated Layered Titanate/TiO2 Composite with Efficient Photocatalytic Activity for NO x Decomposition Reactions

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Kanji Saito ◽  
Shota Orikasa ◽  
Yusuke Asakura ◽  
Yusuke Ide ◽  
Yoshiyuki Sugahara ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Solid State ◽  
Room Temperature ◽  
High Photocatalytic Activity ◽  
Solid State Reactions ◽  
Decomposition Reactions ◽  
Ni Content ◽  
Layered Titanate ◽  
Different Temperatures ◽  
Lower Temperature

A unique structural transformation of a lepidocrocite-type layered titanate, K0.8Ti1.73Li0.27O4, into a rutile-type TiO2 has recently been realized via dilute HCl treatment and subsequent drying at room temperature for producing rutile-nanoparticle-decorated protonated layered titanate exhibiting highly efficient photocatalytic activity. Herein, the authors report synthesis of a lepidocrocite-type layered cesium titanate with nominal compositions of C s 0.7 T i 1.825 ‐ x / 2 N i x □ 0.175 ‐ x / 2 O 4 ( x = 0 , 0.05, 0.1, and 0.35) through solid-state reactions of Cs2CO3, TiO2, and Ni(CH3COO)2·4H2O at different temperatures (600 or 800°C), followed by treatment with dilute HCl and subsequent drying to produce a Ni-doped protonated layered titanate/TiO2 composite. C s 0.7 T i 1.825 ‐ x / 2 N i x □ 0.175 ‐ x / 2 O 4 with an optimized Ni content obtained at a lower temperature was converted into a Ni-doped protonated layered titanate/TiO2 composite to exhibit high photocatalytic activity for NO x decomposition reactions.

scholarly journals Crystal structures and Hirshfeld surface analyses of bis(4,5-dihydrofuran-2-yl)dimethylsilane and (4,5-dihydrofuran-2-yl)(methyl)diphenylsilane

2022 ◽  
Vol 78 (1) ◽  
Author(s):  
Annika Schmidt ◽  
Anna Krupp ◽  
Eva Rebecca Barth ◽  
Carsten Strohmann
Keyword(s):  
Crystal Structures ◽  
Building Blocks ◽  
Hirshfeld Surface ◽  
Polymeric Chain ◽  
Triclinic Crystal System ◽  
Space Group ◽  
Axis Direction ◽  
Crystal System ◽  
Hirshfeld Surfaces ◽  
Interconnected Structure

The title compounds, C10H16O2Si (1) and C17H18OSi (2), are classified as dihydrofurylsilanes, which show great potential as building blocks for various functionalized silanes. They both crystallize in the space group P\overline{1} in the triclinic crystal system. Analyses of the Hirshfeld surfaces show packing-determining interactions for both compounds, resulting in a polymeric chain along the [011] for silane 1 and a layered-interconnected structure along the b-axis direction for silane 2.

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