scholarly journals Rapid Green Synthetic Protocol for Novel Trimetallic Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
B. Karthikeyan ◽  
B. Loganathan
Keyword(s):  
Electron Microscopy ◽  
Spectroscopic Analysis ◽  
Trisodium Citrate ◽  
Metallic Nanostructures ◽  
Structure Directing Agent ◽  
X Ray ◽  
Mw Irradiation ◽  
Xrd Techniques ◽  
First Time ◽  
Scanning Electron

Metallic nanocomposites and nanotubes can be rapidly prepared under microwave irradiation (MW) from an aqueous solution of metallic precursors in the presence of trisodium citrate as a reductant. For the nanotubes nanoparticles are stabilized by poly(N-vinyl-2-pyrrolidone) (PVP), a protecting agent. PVP is a typical capping and structure-directing agent used for the synthesis of various metallic nanostructures. In this work, we have demonstrated for the first time an MW irradiation approach for the synthesis of trimetallic nanocomposites and nanotubes. The resulting nanohybrids were characterized by UV-Vis spectroscopic analysis, high-resolution scanning electron microscopy (HR-SEM), energy dispersive X-ray spectroscopic analysis (EDX), and X-ray diffractometer (XRD) techniques.

New perspectives on Nephridiacanthus major (Acanthocephala: Oligacanthorhynchidae) collected from hedgehogs in Iran

2020 ◽  
Vol 94 ◽  
Author(s):  
O.M. Amin ◽  
M. Sharifdini ◽  
R.A. Heckmann ◽  
M. Zarean
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phylogenetic Analysis ◽  
Chemical Analysis ◽  
Central Asia ◽  
Molecular Profile ◽  
X Ray ◽  
The Family ◽  
First Time ◽  
Scanning Electron

We describe morphological features not previously reported for this old acanthocephalan Nephridiacanthus major (Bremser, 1811 in Westrumb, 1821) Golvan, 1962 first described over 200 years ago. Our specimens were collected from long-eared hedgehog Hemiechinus auritus (Gmelin, 1770) (Erinaceidae) in Iran. We compare the morphometrics of our material with others previously reported from the same host in Iran, Russia, central Asia and Europe. Our specimens had markedly smaller proboscides, proboscis hooks and lemnisci than those reported from Russia and central Asia, but comparable measurements of other structures with specimens previously described from other collections. We document our new observations with scanning electron microscopy features not previously demonstrable by other observers and provide a chemical analysis of proboscis hooks using energy-dispersive X-ray analysis for the first time. The molecular profile of this acanthocephalan, based on 18S rDNA and cox1 genes, was generated for the first time. The phylogenetic analysis showed that N. major is placed in a clade of the family Oligacanthorhynchidae, well separated from the families Moniliformidae and Gigantorhynchidae.

Synthesis, Phase Formation and Characterization of Co4Nb2O9 Powders Synthesized by Solid-State Reaction

2008 ◽  
Vol 55-57 ◽  
pp. 873-876 ◽  
Author(s):  
N. Chaiyo ◽  
R. Muanghlua ◽  
A. Ruangphanit ◽  
Wanwilai C. Vittayakorn ◽  
Naratip Vittayakorn
Keyword(s):  
Electron Microscopy ◽  
Solid State ◽  
Solid State Reaction ◽  
Dwell Time ◽  
Single Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Techniques ◽  
Scanning Electron

A corundum-type structure of cobalt niobate (Co4Nb2O9) has been synthesized by a solid-state reaction. The formation of the Co4Nb2O9 phase in the calcined powders was investigated as a function of calcination conditions by differential thermal analysis (DTA) and X-ray diffraction (XRD) techniques. Morphology and particle size have been determined by scanning electron microscopy (SEM). It was found that the minor phases of unreacted Co3O4 tend to form together with the columbite CoNb2O6 phase at a low calcination temperature and short dwell time. It seems that the single-phase of Co4Nb2O9 in a corundum phase can be obtained successfully at the calcination conditions of 900°C for 60 min, with heating/cooling rates of 20°C /min.

scholarly journals Calcium Oxalates in Lichens on Surface of Apatite-Nepheline Ore (Kola Peninsula, Russia)

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 656 ◽  
Author(s):  
Frank-Kamenetskaya ◽  
Ivanyuk ◽  
Zelenskaya ◽  
Izatulina ◽  
Kalashnikov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Composition ◽  
Kola Peninsula ◽  
Metabolic Activity ◽  
X Ray ◽  
Calcium Oxalates ◽  
Essential Questions ◽  
First Time ◽  
Scanning Electron

The present work contributes to the essential questions on calcium oxalate formation under the influence of lithobiont community organisms. We have discovered calcium oxalates in lichen thalli on surfaces of apatite-nepheline rocks of southeastern and southwestern titanite-apatite ore fields of the Khibiny peralkaline massif (Kola Peninsula, NW Russia) for the first time; investigated biofilm calcium oxalates with different methods (X-ray powder diffraction, scanning electron microscopy, and EDX analysis) and discussed morphogenetic patterns of its formation using results of model experiments. The influence of inorganic and organic components of the crystallization medium on the phase composition and morphology of oxalates has been analyzed. It was shown that, among the complex of factors controlling the patterns of biogenic oxalate formation, one of the main roles belongs to the metabolic activity of the lithobiont community organisms, which differs significantly from the activity of its individuals.

scholarly journals Graphene Oxide-Assisted Morphology and Structure of Electrodeposited ZnO Nanostructures

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 365 ◽  
Author(s):  
N. Ma. Rosas-Laverde ◽  
A. Pruna ◽  
D. Busquets-Mataix ◽  
D. Pullini
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Deposition Potential ◽  
Zno Nanostructures ◽  
X Ray Diffraction ◽  
Structure Directing Agent ◽  
X Ray ◽  
Growth Orientation ◽  
Morphology And Structure ◽  
Scanning Electron

In this paper, ZnO electrodeposition was studied with the presence of graphene oxide (GO) exploited as a possible structure-directing agent. The effect of deposition potential and duration on the morphology and structure of ZnO was analyzed. The morphology and structure of the hybrids was analyzed by Raman spectroscopy, X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM). The Raman results indicate a successful modification of ZnO with GO sheets and a hybridization threshold of 10 mg L−1 by the evolution of the defect related band of ZnO at 580 cm−1. The morphology results show that a low GO content only slightly influences the morphology and orientation of ZnO nanostructures while a high content as 10 mg L−1 changes the morphology in nanoplates and growth orientation to lateral. The results show that while GO participated in the deposition reaction, it has a two-fold role, also by structure-controlling ZnO, indicating that the approach is valid for the use of GO as a structure-directing agent for the fabrication of ZnO nanostructures by electrodeposition with varying morphologies and orientations.

scholarly journals Microstructure of metatitanic acid and its transformation to rutile titanium dioxide

2020 ◽  
Vol 39 (1) ◽  
pp. 627-632
Author(s):  
Xiaoping Wu ◽  
Yong Liu
Keyword(s):  
Electron Microscopy ◽  
Titanium Dioxide ◽  
Secondary Particle ◽  
Building Blocks ◽  
X Ray ◽  
Metatitanic Acid ◽  
Primary Particles ◽  
Rutile Titanium Dioxide ◽  
First Time ◽  
Scanning Electron

AbstractThe microstructure of metatitanic acid and its transformations to titanium dioxide during calcination have been investigated previously. However, the detailed microstructure of metatitanic acid has not been elucidated. Herein, we report the high-resolution scanning electron microscopy and X-ray powder diffraction determinations of the microstructure of metatitanic acid and its transformation to titanium dioxide during calcination. It is the first time that the detailed microstructure of metatitanic acid and its transformation to rutile titanium dioxide during calcination have been observed and elucidated. A mechanism of the transformation from metatitanic acid to crystalline titanium dioxide during calcination is described. The basic building blocks of metatitanic acid are the ultrafine crystals with an averaged diameter of a few nanometres, and these ultrafine crystals aggregate to form the porous primary particles. The primary particles further agglomerate to form the porous secondary particle. During the calcination, metatitanic acid undergoes size enlargement of ultrafine crystals, anatase–rutile transformation, merge of primary particles, and the crystal growth of titanium dioxide.

scholarly journals Mechanical Properties of Enamel Nanocomposite

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Nilormi Biswas ◽  
Arjun Dey ◽  
Saugata Kundu ◽  
Himel Chakraborty ◽  
Anoop K. Mukhopadhyay
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Scanning Electron Microscopy ◽  
X Ray ◽  
Young’S Moduli ◽  
Relative Differences ◽  
First Time ◽  
Microindentation Technique ◽  
Work Of Fracture ◽  
Scanning Electron

For adult Indian premolar teeth, we report for the first time ever the simultaneous evaluations of nanohardness, Young's modulus, and fracture toughness of the enamel nanocomposite. The nanohardness and Young's moduli were evaluated from near the beginning of the middle enamel region to within ~10 μm of the dentino-enamel junction (DEJ) and in the dentin region using the nanoindentation technique. The fracture toughness from near the middle of the enamel region to near the DEJ zone was measured using the microindentation technique. The deformation was studied using scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM). The relative differences in the extents of biomineralization in the enamel and dentin regions were studied by the energy dispersive X-ray (EDS) technique. The variations of the toughness of the enamel as a function of the toughness of the protein matrix phase have been analyzed which showed that the predicted value of the toughness of the protein present in the nanocomposite was comparable to that of other bioproteins reported in the literature. Further, the work of fracture estimated from the measured value of toughness of the enamel nanocomposite agreed well with the experimental data reported in the literature.

Time-Temperature Effect for Preparation of SnO2 Nanostructures Using Carbon Assisted

2014 ◽  
Vol 680 ◽  
pp. 38-41
Author(s):  
Dheerachai Polsongkram ◽  
Pattanasuk Chamninok ◽  
Suchaowadee Changsakul ◽  
Atipong Sriputhorn ◽  
Supakorn Pukird
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chemical Vapor ◽  
X Ray Diffraction ◽  
X Ray ◽  
Si Substrates ◽  
Xrd Techniques ◽  
Source Materials ◽  
Vapor Deposit ◽  
Scanning Electron

We studied the effect of time and temperature for preparation of SnO2 nanostructures by chemical vapor deposit methods. SnO2 nanostructures were synthesized using Sn powder with carbon charcoal as starting materials. The source materials and Si substrates were heated with various times, temperatures under atmosphere of nitrogen and oxygen. The synthesized products were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) techniques. The results showed the nanostructures of prepared products were very uniformly of SnO2 nanowires with diameter about 100-300 nm and length around more 1-2 μm depending on times and temperatures.

Hydrothermal Synthesis of 3D Flower-Like Bismuth Trisulphide Microcrystallines

2013 ◽  
Vol 634-638 ◽  
pp. 2207-2210 ◽  
Author(s):  
Pin Jiang Li ◽  
Yan Ge Zhang ◽  
Bao Jun Huang ◽  
Chen Yu ◽  
Ling Zhuge ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Process ◽  
X Ray Diffraction ◽  
Structure Directing Agent ◽  
X Ray ◽  
Laser Raman ◽  
One Step ◽  
Scanning Electron

3D flower-like bismuth trisulphide microcrystallines has been successfully prepared via one step hydrothermal process and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and laser Raman spectrometer techniques. The morphologies of the Bi2S3 microcrystallines were influenced by the surfactant Na2(EDTA), which acts as a structure directing agent.

scholarly journals Studies on the preparation of lead(II) chloride from galvanizing plant wastes

2013 ◽  
Vol 47 (4) ◽  
pp. 415-420 ◽  
Author(s):  
MM Rahman ◽  
AJMT Neger ◽  
A Gafur ◽  
ASW Kurny
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrochloric Acid ◽  
Diffraction Analysis ◽  
Atomic Absorption ◽  
Spectroscopic Analysis ◽  
Lead Chloride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Galvanizing plant wastes containing 71.82% lead was leached in hydrochloric acid. Lead was precipitated from the leach liquor as lead chloride and purified by recrystallisation. The process parameters like concentration of hydrochloric acid, time of leaching, mode of reaction, number of re-crystallization etc. were optimised. Nearly 70% of lead contained by the waste material could be leached out and converted to lead(II) chloride. The product (PbCl2) was characterised by atomic absorption spectroscopy, thermogravimetric analysis, x-ray diffraction analysis, and scanning electron microscopy. Atomic absorption spectroscopic analysis showed that the product was 93% pure. X-ray diffraction analysis confirmed that the product possess cotunnite phase having orthorhombic structure. The needle like shape of the prepared PbCl2 crystal was confirmed by scanning electron microscopy. Physical properties like melting point and density were also very close to those reported in literature. Bangladesh J. Sci. Ind. Res. 47(4), 415-420, 2012 DOI: http://dx.doi.org/10.3329/bjsir.v47i4.14071

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.

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