scholarly journals The Zr-Doped CaO CO2 Sorbent Fabricated by Wet High-Energy Milling

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4110
Author(s):  
Vyacheslav V. Rodaev ◽  
Svetlana S. Razlivalova
Keyword(s):  
Zirconium Dioxide ◽  
High Energy ◽  
Co2 Uptake ◽  
Fabrication Technique ◽  
X Ray Diffraction ◽  
Uptake Capacity ◽  
X Ray ◽  
Co2 Sorbent ◽  
First Time ◽  
Scanning Electron

We fabricated the Zr-doped CaO sorbent for high-temperature CO2 capture by the wet high-energy co-milling of calcium carbonate and natural zirconium dioxide (baddeleyite) for the first time. The morphology of the material was examined by scanning electron microscopy, energy-dispersive X-ray analysis and X-ray diffraction. Its CO2 uptake capacity was determined using thermogravimetric analysis. After 50 carbonation–calcination cycles, the Zr-doped CaO sorbent characterized by a high enough CO2 uptake capacity of 8.6 mmol/g and unchanged microstructure due to CaZrO3 nanoparticles uniformly distributed in the CaO matrix to prevent CaCO3 sintering under carbonation. The proposed easy-to-implement CaO-based sorbents fabrication technique is promising for industrial application.

Mechanochemical Synthesis of Intermetallic Compounds in the Gallium–Iridium System

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940067
Author(s):  
P. Vitiaz ◽  
N. Lyakhov ◽  
T. Grigoreva ◽  
E. Pavlov
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Mechanical Activation ◽  
Intermetallic Compounds ◽  
High Energy ◽  
Planetary Mill ◽  
X Ray Diffraction ◽  
X Ray ◽  
Active Liquid ◽  
Scanning Electron

The interaction between a solid inert metal Ir and an active liquid metal Ga during mechanical activation in a high-energy planetary mill is studied by X-ray diffraction and scanning electron microscopy with high-resolution energy dispersive X-ray microanalysis. The effect of mechanical activation on the formation of GaxIry intermetallic compounds and GaxIry/Ir composites and their solubility in acids was investigated. The subsequent extraction of Ga from intermetallic compounds and composites in the mixture of concentrated acids [Formula: see text] makes it possible to produce nanoscale Ir.

scholarly journals Electroactive Hydrogels Made with Polyvinyl Alcohol/Cellulose Nanocrystals

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1615 ◽  
Author(s):  
Tippabattini Jayaramudu ◽  
Hyun-U Ko ◽  
Hyun Kim ◽  
Jung Kim ◽  
Ruth Muthoka ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Active Drug ◽  
X Ray Diffraction ◽  
Uptake Capacity ◽  
X Ray ◽  
Freeze Thaw ◽  
Actuation Mechanism ◽  
Water Uptake Capacity ◽  
Electrostatic Effect ◽  
Scanning Electron

This paper reports a nontoxic, soft and electroactive hydrogel made with polyvinyl alcohol (PVA) and cellulose nanocrystal (CNC). The CNC incorporating PVA-CNC hydrogels were prepared using a freeze–thaw technique with different CNC concentrations. Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy results proved the good miscibility of CNCs with PVA. The optical transparency, water uptake capacity and mechanical properties of the prepared hydrogels were investigated in this study. The CNC incorporating PVA-CNC hydrogels showed improved displacement output in the presence of an electric field and the displacement increased with an increase in the CNC concentration. The possible actuation mechanism was an electrostatic effect and the displacement improvement of the hydrogel associated with its enhanced dielectric properties and softness. Since the prepared PVA-CNC hydrogel is nontoxic and electroactive, it can be used for biomimetic soft robots, actively reconfigurable lenses and active drug-release applications.

Characterization Techniques For Laser-Annealed Polysilicon on Insulating Layers

1980 ◽  
Vol 1 ◽  
Author(s):  
J. T. Schott ◽  
J. J. Comer
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Energy ◽  
High Energy Electron ◽  
X Ray Diffraction ◽  
X Ray ◽  
Characterization Techniques ◽  
Cw Laser ◽  
Transmission Electron ◽  
Scanning Electron

ABSTRACTVarious characterization techniques are applied to pulsed and cw laser-annealed polysilicon layers deposited on oxide layers. The results are used to compare these techniques as to the type and completeness of information provided, as well as sample preparation requirements and general ease or difficulty of measurement. The techniques employed include scanning electron microscopy (SEM), electron channeling micrographs and selected area channeling patterns (SACP), reflection (high energy) electron diffraction (RHEED), transmission electron microscopy (TEM) and selected area diffraction (SAD), x-ray diffraction, optical techniques and etching techniques.

scholarly journals Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate

2012 ◽  
Vol 66 (3) ◽  
pp. 309-315 ◽  
Author(s):  
Tanja Barudzija ◽  
Alexey Gusev ◽  
Dragana Jugovic ◽  
Milena Marinovic-Cincovic ◽  
Miroslav Dramicanin ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Single Phase ◽  
High Energy ◽  
Argon Atmosphere ◽  
Molar Ratio ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Mean ◽  
First Time

Nanosized perovskite YTiO3 with the mean crystallite size of 18 nm was synthesized for the first time by mechanochemical treatment. The mechanochemical solid state reaction between commercial Y2O3 powder and mechanochemically synthesized TiO powder in molar ratio 0.5:1 was completed for 3 h in a high-energy planetary ball mill in argon atmosphere. The heating in vacuum at 1150 ?C for 12 h transforms nanosized YTiO3 to a well-crystallized single-phase perovskite YTiO3. Both samples were characterized by X-ray diffraction (XRD) and thermogravimetric (TGA/DTA) analyses, as well as superconducting quantum interference device magnetometer (SQUID) measurements.

Nanocrystalline Intermetallic Mg2Ni Produced in a Batch Scale Mill

2006 ◽  
Vol 509 ◽  
pp. 141-146
Author(s):  
E. Martínez-Franco ◽  
Thomas Klassen ◽  
Rüdiger Bormann ◽  
D. Jaramillo-Vigueras
Keyword(s):  
Ball Mill ◽  
Energy Dispersive Spectrometry ◽  
Particle Morphology ◽  
High Energy ◽  
X Ray Diffraction ◽  
Batch Production ◽  
Production Scale ◽  
X Ray ◽  
Powder Mass ◽  
Scanning Electron

Nanocrystalline intermetallic Mg2Ni is successfully produced on a batch production scale from elemental powder blends by mechanical alloying using a high-energy rotor ball mill (Simoloyer). Different ball-to-powder mass ratios are used in order to provide results for scaling to industrial production. Transformation of elemental Mg-Ni powders into the Mg2Ni intermetallic is observed by x-ray diffraction. Particle morphology during milling is observed by scanning electron microscopy. A relatively low Fe contamination is estimated by energy dispersive spectrometry.

scholarly journals Estudio petrográfico, geoquímico y mineralógico de la fulgurita San José de Lourdes, Zacatecas, México

2017 ◽  
Vol 34 (3) ◽  
pp. 170
Author(s):  
Adela Margarita Reyes-Salas ◽  
Consuelo Macías-Romo ◽  
Fernado Ortega-Gutiérrez ◽  
Eugenio Octavio Reyes-Salas ◽  
Daniel Flores-Gutiérrez ◽  
...  
Keyword(s):  
Lightning Strike ◽  
San Jose ◽  
X Ray Diffraction ◽  
Polarizing Microscopy ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Fe Alloys ◽  
Calcium Compounds ◽  
First Time ◽  
Scanning Electron

Petrographic, chemical and mineralogical studies were performed on a fulgurite formed by melting of soil by lightning strike located at San José de Lourdes, northeast of Fresnillo, State of Zacatecas, Mexico. Polarizing microscopy, scanning electron microscopy with EDS, micro- probe WDS analyses, micro-Raman spectroscopy, X-ray diffraction and X-ray fluorescence were used as analytical methods. Most of the specimens are tubular and have a smooth, lustrous, black, glassy texture while the exterior is encrusted with soil grains. Internally, this fulgurite is partly composed of heterogeneous vesicular glass mostly of andesitic composi- tion containing fragments of skeletal crystals of wollastonite and unde- termined Fe- silicate, spheroids of SiO2 similar to ballen quartz within the glass. The presence of very fine and scarce grains of ilmenite, zircon, apatite, silver and gold besides some Si-Fe alloys (silicides) of variable composition and arsenic-calcium compounds (which is found for the first time in fulgurites) is also reported. We estimate that the temperatures of crystallization were above 1,700 °C considering into account the melting of quartz and presence of reduced phases.

Photoluminescence and Structure of Chemically Etched Si

1991 ◽  
Vol 256 ◽  
Author(s):  
S. Shih ◽  
K. H. Jung ◽  
T. Y. Hsieh ◽  
J. Sarathy ◽  
C. Tsai ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Morphology ◽  
Chemical Etching ◽  
Room Temperature ◽  
Porous Si ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time ◽  
Scanning Electron

ABSTRACTWe demonstrate for the first time that chemical etching of Si in HF-HNO3-based solution without applying bias can produce a room temperature photoluminescent porous Si layer. Scanning electron microscope studies reveal a surface morphology similar to that of the conventionally anodized porous Si. The formation mechanism of the chemically etched (CE) film can be explained by a local anodization concept. X-ray diffraction studies on the luminescent CE porous Si show a broad amorphous peak.

Sintering of Al4C3 Using Aluminum Scrap and Commercial Graphite

2014 ◽  
Vol 802 ◽  
pp. 66-71
Author(s):  
Rodrigo Estevam Coelho ◽  
D.B. Silvany ◽  
M.D.C. Sobral ◽  
M.C.A. Silva
Keyword(s):  
Ball Mill ◽  
Graphite Powder ◽  
High Energy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Aluminum Scrap ◽  
X Ray ◽  
High Energy Ball Mill ◽  
Energy Ball ◽  
Scanning Electron

In this works, aluminum scraps powders were mixed with commercial graphite and mechanically alloyed in a high-energy ball mill and subsequently powders sintering. The initial grinding of aluminum scraps for 2 hours and then mixed with commercial graphite powder at a proportion of (y)Al-(x)C (wt%) (x = 1, 5 e 10, 25). The mixture of aluminum and graphite powders was processed for a time at 5 hours of milling. The samples were sintered at a temperature of 750°C and 1000°C. Samples were analyzed by scanning electron microscopy and X-ray diffraction. The results of this study were to find important parameters of composition and sintering, because the increase in concentration of carbon in the aluminum indicates that the material may have different applications.

Syntheses of Mesoporous ZnO and SnO2 Microspheres by Spray Reaction Process

2012 ◽  
Vol 519 ◽  
pp. 74-78 ◽  
Author(s):  
Hui Zhang ◽  
Chen Chen ◽  
Xiao Long Xu ◽  
Rong Wu ◽  
Fan Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Spherical Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Particles ◽  
Mesoporous Zno ◽  
Average Size ◽  
Synthesized Materials ◽  
First Time ◽  
Scanning Electron

For the first time, mesoporous ZnO and SnO2 spherical particles were synthesized by spray reaction (SR) process. The synthesized materials were characterized by thermo-gravimetry/differential thermal analysis (TG/DTA), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Results reveal that few ZnO microspheres were formed after calcined at 700 °C while large quantity of non-spherical ZnO particles was produced. And the predominant hexagonal ZnO (h-ZnO) is attained when heated at 700 °C. Mesoporous SnO2 microspheres prepared at 800 °C possess an average size ~2.22 μm and a major tetragonal phase (t- SnO2) with crystallite size 7.8 nm.

scholarly journals Synthesis and electrochemical performance of Li2Co1− x M x PO4F (M = Fe, Mn) cathode materials

2013 ◽  
Vol 4 ◽  
pp. 860-867 ◽  
Author(s):  
Nellie R Khasanova ◽  
Oleg A Drozhzhin ◽  
Stanislav S Fedotov ◽  
Darya A Storozhilova ◽  
Rodion V Panin ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Single Phase ◽  
High Energy ◽  
Initial Discharge Capacity ◽  
X Ray Diffraction ◽  
Energy Materials ◽  
X Ray ◽  
High Energy Materials ◽  
Initial Discharge ◽  
Scanning Electron

In the search for high-energy materials, novel 3D-fluorophosphates, Li2Co1− x Fe x PO4F and Li2Co1− x Mn x PO4F, have been synthesized. X-ray diffraction and scanning electron microscopy have been applied to analyze the structural and morphological features of the prepared materials. Both systems, Li2Co1− x Fe x PO4F and Li2Co1− x Mn x PO4F, exhibited narrow ranges of solid solutions: x ≤ 0.3 and x ≤ 0.1, respectively. The Li2Co0.9Mn0.1PO4F material demonstrated a reversible electrochemical performance with an initial discharge capacity of 75 mA·h·g−1 (current rate of C/5) upon cycling between 2.5 and 5.5 V in 1 M LiBF4/TMS electrolyte. Galvanostatic measurements along with cyclic voltammetry supported a single-phase de/intercalation mechanism in the Li2Co0.9Mn0.1PO4F material.

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