scholarly journals Synthesis of Magnesium Oxide Nanopowder by Thermal Plasma Using Magnesium Nitrate Hexahydrate

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
V. Sirota ◽  
V. Selemenev ◽  
M. Kovaleva ◽  
I. Pavlenko ◽  
K. Mamunin ◽  
...  
Keyword(s):  
Magnesium Oxide ◽  
Thermal Plasma ◽  
Experimental Studies ◽  
Analytical Techniques ◽  
Magnesium Nitrate ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
Magnesium Nitrate Hexahydrate ◽  
Transmission Electron ◽  
Characterization Studies

Magnesium oxide (MgO) nanopowder was synthesized by thermal plasma in a novel thermal DC plasma torch using magnesium nitrate hexahydrate. Magnesium nitrate hexahydrate (Mg(NO3)2·6H2O) was obtained from serpentinite (Mg3Si2O5(OH)4; lizardite) (Halilovskiy array, Orenburg region, Russia). The synthesized samples were characterized by analytical techniques including X-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD and TEM characterization studies confirmed that MgO nanopowder obtained has periclase structure with high purity, and the particle sizes vary within the range of 100 nm to 150 nm. We believe that the present work will promote further experimental studies on the physical properties and the applications of MgO nanopowders in the fields such as high-densed ceramics, additives in bactericide, and refractory products.

scholarly journals Collagen-Coated Superparamagnetic Iron Oxide Nanoparticles as a Sustainable Catalyst for Spirooxindole Synthesis

2021 ◽  
Author(s):  
Shima Ghanbari ◽  
Maryam Esmkhani ◽  
Shahrzad Javanshir
Keyword(s):  
Electron Microscopy ◽  
Crosslinking Agent ◽  
Superparamagnetic Iron Oxide ◽  
Analytical Techniques ◽  
Sio2 Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Bet Analysis ◽  
Characterization Studies

Abstract In this work, a novel magnetic organic-inorganic hybrid catalyst was fabricated by encapsulating magnetite@silica (Fe3O4@SiO2) nanoparticles with Isinglass protein collagen (IGPC) using epichlorohydrin (ECH) as crosslinking agent. Characterization studies of the prepared particles were accomplished by various analytical techniques specifically, Fourier transform infrared (FTIR) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), and Brunauer−Emmett−Teller (BET) analysis. The XRD results showed a crystalline and amorphous phase which contribute to magnetite and isinglass respectively. Moreover, the formation of the core/shell structure had been confirmed by TEM images. The synthesized Fe3O4@SiO2/ECH/IG was applied as bifunctional heterogeneous catalyst in the synthesis of spirooxindole derivatives demonstrating excellent catalytic properties, stability and recyclability.

Synthesis, growth and characterization of L-Leucine Magnesium Nitrate Hexahydrate crystal

2022 ◽  
Author(s):  
Chandrashekhar M. Bhambere ◽  
N. G. Durge
Keyword(s):  
Grown Crystal ◽  
Second Harmonic ◽  
Magnesium Nitrate ◽  
Supersaturated Solution ◽  
Dielectric Study ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
Magnesium Nitrate Hexahydrate ◽  
Thermal Stability Of

L-Leucine Magnesium Nitrate HexaHydrate ([Formula: see text]) crystal is a nonlinear optical (NLO) material of semiorganic type. It has grown using a slow evaporation solution growth (SEST) technique at elevated temperature (40∘C) by dissolving LL+MNHH in double distilled water. It was crystalized and recrystalized from a supersaturated solution by stirring it for several hours to get high optical perfection. The X-ray diffraction studies confirmed the presence of the intermixed compound in the [Formula: see text] crystal and possess monoclinic structure. Fourier transform infrared spectroscopy (FTIR) spectrum identified the functional groups of the grown crystal. The crystal has very good optical absorption and transparency in the UV–Vis region. The thermal analysis revealed the thermal stability of the crystal. The dielectric study shows that dielectric constant and dielectric loss decrease at higher frequencies. The crystal showed nonlinear property by second-harmonic generation (SHG) study. This type of material with fair nonlinearity is useful in optoelectronics application devices.

scholarly journals Investigating the Physical Properties of Sintered Alumina in the Presence of MgO Nanopowder

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Mehran Dadkhah ◽  
Abdollah Saboori ◽  
Majid Jafari
Keyword(s):  
Electron Microscope ◽  
Physical Properties ◽  
Grain Boundaries ◽  
Spinel Phase ◽  
Sol Gel ◽  
Inert Atmosphere ◽  
Magnesium Nitrate ◽  
Nitrate Hexahydrate ◽  
Magnesium Nitrate Hexahydrate ◽  
Transmission Electron

Magnesium oxide nanopowder is synthesized using magnesium nitrate hexahydrate and oxalic acid as precursors via the sol-gel method. In order to investigate the effect of magnesia nanopowders on the physical properties of sintered alumina, 0.1, 0.3, and 0.5 wt% of MgO are added to alumina. The prepared specimens were sintered at 1570°C for 4 hours under an inert atmosphere. The morphology and size of nanopowders were characterized by transmission electron microscope (TEM) and scanning electron microscope (SEM). Structural analysis was investigated by means of Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). Outcomes show that by increasing the percentage of MgO, spinel phase (MgAl2O4) has been formed in the structure of alumina. During the sintering process, spinel phase diffused through the grain boundaries and pinned the grain boundaries which led to decrease in grain sizes. So, by decreasing the grain size, the physical properties of sintered alumina have improved.

Formation Mechanisms of Sol-Gel Derived Cordierite

2006 ◽  
Vol 45 ◽  
pp. 266-271
Author(s):  
E. Tkalcec ◽  
H. Ivankovic ◽  
J. Macan ◽  
A. Hriberski
Keyword(s):  
Intermediate Phase ◽  
Sol Gel ◽  
Magnesium Nitrate ◽  
Formation Mechanisms ◽  
Sintering Behavior ◽  
Nitrate Hexahydrate ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Magnesium Nitrate Hexahydrate ◽  
Gel Technique

Gels with cordierite stoichiometry, Mg2Al4Si5O18, were prepared by sol-gel technique using three different starting aluminum sources: nano-sized γ-Al2O3, aluminium nitrate nonahydrate and Al-sec-butoxide, as aluminum sources, using tetraetoxysilane (TEOS) and magnesium nitrate hexahydrate in all three gels as sources for silicon and magnesium. The influence of Al-precursors on formation mechanism and sintering behavior of gels was studied by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and dilatometry. Gels calcined at 700°C were characterized by different specific surface area, pore sizes and different crystallization sequences. For gel with nano-sized γ-Al2O3 α-cordierite was formed at 1220°C through intermediate MgAl2O4 phase. If aluminum was introduced as Al-sec-butoxide μ-cordierite crystallized in two steps (760 and 1070°C) and the transformation μ-cordierite→α-cordierite occurred at 1250°C. When Al(NO3)3·9H2O was introduced as intermediate phase crystallized MgAl2O4 at ~870°C and μ- cordierite at ~950°C. Both phases reacted with amorphous silica forming α-cordierite at ~1210°C. Compacts prepared from gels with aluminum-nitrates and Al-sec-butoxide, respectively, sintered between 700 and 1000°C, whereas the gel derived from γ-Al2O3 sintered in two steps; between 700- 1000°C and 1010 and 1250°C.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

scholarly journals Applications of a simultaneous differential scanning calorimetry–thermomicroscopy system

2021 ◽  
Author(s):  
Gage P. Ashton ◽  
Edward L. Charsley ◽  
Lindsay P. Harding ◽  
Gareth M. B. Parkes
Keyword(s):  
Silver Iodide ◽  
Magnesium Nitrate ◽  
Optical Data ◽  
Nitrate Hexahydrate ◽  
Scanning Calorimetry ◽  
Rubidium Nitrate ◽  
Complex Processes ◽  
Magnesium Nitrate Hexahydrate ◽  
Intensity Measurements ◽  
Reversible Transitions

AbstractA simultaneous DSC–thermomicroscopy system (DSC450 Linkam Scientific) was applied to the study of phase transitions in rubidium nitrate and silver iodide, the oxidation of polyethylene, the thermal degradation of polylactic acid and magnesium nitrate hexahydrate, and the reversible transitions in thermochromic inks. The results demonstrated the benefits of obtaining simultaneous optical data, both images and light intensity measurements, with DSC, particularly in the interpretation of complex processes and the detection of events with small changes in enthalpy.

Hydrothermal Synthesis of MgBO2(OH) Nanomaterials

2011 ◽  
Vol 268-270 ◽  
pp. 195-199
Author(s):  
Guo Sheng Wang ◽  
Kang Jun Wang ◽  
Jia Hou ◽  
Hong Yan Sun ◽  
Ying Ming Wang
Keyword(s):  
Hydrothermal Synthesis ◽  
Crystal Morphology ◽  
Magnesium Nitrate ◽  
Nitrate Hexahydrate ◽  
Temperature Reaction ◽  
Hydrothermal Route ◽  
Magnesium Borate ◽  
Reaction Condition ◽  
Magnesium Nitrate Hexahydrate ◽  
Composition Structure

Magnesium borate hydroxide (MgBO2(OH) ) were synthesized using magnesium nitrate hexahydrate(MgNO3.6H2O) and borax decahydrate(Na2B4O7.10H2O) by hydrothermal route. Effect of reaction temperature , reaction time and water's volume on the composition , structure , and crystal morphology of the products were investigated, and the products were characterized by XRD and SEM. The results indicated that all of the products were szaibelyite with the reaction condition investigated, and crystal morphology could be tailored via varying the reaction condition.

scholarly journals Anticoagulant, thrombolytic and antibacterial activities of Euphorbia acruensis latex-mediated bioengineered silver nanoparticles

2019 ◽  
Vol 8 (1) ◽  
pp. 590-599 ◽  
Author(s):  
Kaushik Roy ◽  
Ambikesh K. Srivastwa ◽  
Chandan K. Ghosh
Keyword(s):  
Silver Nanoparticles ◽  
Analytical Techniques ◽  
Antibacterial Activities ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Antibacterial Study ◽  
X Ray ◽  
Transmission Electron ◽  
Human Blood Samples ◽  
Green Synthesized Silver Nanoparticles

Abstract In this report, we present a simple and unexplored procedure for green synthesis of silver nanoparticles featuring exudation of Euphorbia acruensis along with the study of its antibacterial and anticoagulant properties. Analytical techniques like ultraviolet visible spectroscopy (UV-Vis), X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) were used to analyse the production, crystallinity and morphology of bio-reduced silver nanoparticles. The antibacterial study was performed by following standard disc diffusion method. Most importantly, the anticoagulant and thrombolytic activities of biogenic silver nanoparticles were evaluated by addition of nanoparticles to human blood samples under practical conditions. These green synthesized silver nanoparticles were found to have potent antibacterial, anticoagulant and thrombolytic properties which make them an attractive choice for future medical applications.

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