scholarly journals Characterizations and morphology of sodium tungstate particles

2018 ◽  
Vol 5 (8) ◽  
pp. 172214 ◽  
Author(s):  
F. Dkhilalli ◽  
S. Megdiche Borchani ◽  
M. Rasheed ◽  
R.  Barille ◽  
S. Shihab ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Energy Gap ◽  
Sodium Tungstate ◽  
Average Particle Size ◽  
Complex Impedance ◽  
Average Particle ◽  
X Ray ◽  
Force Microscopy ◽  
Transmission Electron ◽  
Dielectric Data

A solid-state reaction technique was used to synthesize polycrystalline Na 2 WO 4 . Preliminary X-ray studies revealed that the compound has a cubic structure at room temperature. The formation of the compound has been confirmed by X-ray powder diffraction studies and Raman spectroscopy. Electrical and dielectric properties of the compound have been studied using complex impedance spectroscopy in the frequency range 209 Hz–1 MHz and temperature range 586–679 K. The impedance data were modellized by an equivalent circuit consisting of series of a combination of grains and grains boundary. We use complex electrical modulus M * at various temperatures to analyse dielectric data. The modulus plots are characterized by the presence of two relaxation peaks thermally activated. The morphologies and the average particle size of the resultant sodium tungstate sample were demonstrated by atomic force microscopy, scanning electron microscopy and transmission electron microscopy. The thicknesses and optical constants of the sample have been calculated using ellipsometric measurements in the range of 200–22 000 nm by means of new amorphous dispersion formula which is the objective of the present work. The results were obtained for Na 2 WO 4 particles from experimental (EXP) and measured (FIT) data showed an excellent agreement. In addition, the energy gap of the Na 2 WO 4 sample has been determined using ellipsometry and confirmed by spectrophotometry measurements.

Biosynthesis and Characterization of Copper Nanoparticles Using a Bioflocculant Extracted from Alcaligenis faecalis HCB2

2019 ◽  
Vol 11 (11) ◽  
pp. 1064-1070 ◽  
Author(s):  
Nkosinathi G. Dlamini ◽  
Albertus K. Basson ◽  
V. S. R. Rajasekhar Pullabhotla
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Copper Nanoparticles ◽  
Average Particle Size ◽  
Thermo Gravimetric Analysis ◽  
Average Particle ◽  
Gravimetric Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir

Bioflocculant from Alcaligenis faecalis HCB2 was used in the eco-friendly synthesis of the copper nanoparticles. Nanoparticles were characterized using a scanning electron microscope (SEM), transmission electron microscopy (TEM), UV-visible spectroscopy, thermo gravimetric analysis (TGA) and Fourier Transform Infrared Spectroscopy (FT-IR). The transmission electron microscopy images showed close to spherical shapes with an average particle size of ∼53 nm. Energy-dispersive X-ray spectroscopy analysis confirmed the presence of the Cu nanopartilces and also the other elements such as O, C, P, Ca, Cl, Na, K, Mg, and S originated from the bioflocculant. FT-IR results showed the presence of the –OH and –NH2 groups, aliphatic bonds, amide and Cu–O bonds. Powder X-ray diffraction peaks confirmed the presence of (111) and (220) planes of fcc structure at 2 of 33° and 47° respectively with no other impurity peaks.

DIELECTRIC PROPERTIES OF ULTRAFINE Zn-DOPED CaCu3Ti4O12 CERAMIC

2012 ◽  
Vol 02 (01) ◽  
pp. 1250007 ◽  
Author(s):  
LAXMAN SINGH ◽  
U. S. RAI ◽  
K. D. MANDAL ◽  
MADHU YASHPAL
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Room Temperature ◽  
Single Phase ◽  
Average Particle Size ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Sintered Powder

Ultrafine powder of CaCu2.80Zn0.20Ti4O12 ceramic was prepared using a novel semi-wet method. DTA/TG analysis of dry powder gives pre-information about formation of final product around 800°C. The formation of single phase was confirmed by X-ray diffraction analysis. The average particle size of sintered powder of the ceramic obtained from XRD and Transmission electron microscopy was found 59 nm and 102 nm, respectively. Energy Dispersive X-ray studies confirm the stoichiometry of the synthesized ceramic. Dielectric constant of the ceramic was found to be 2617 at room temperature at 1 kHz.

Studies on conducting nanocomposite with gallium nitride–doped ferrite, part-II

2017 ◽  
Vol 231 (1) ◽  
pp. 53-63
Author(s):  
Rajani Indrakanti ◽  
V Brahmaji Rao ◽  
C Udaya Kiran
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gallium Nitride ◽  
Crystallite Size ◽  
Average Particle Size ◽  
Average Particle ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

This article (a sequel to part-I that appeared earlier in the same journal) presents synthesis and characterisation details of conducting PPY-nanocomposite obtained from gallium nitride–doped ferrite and polypyrrole. The GaN-doped ferrite is synthesised by sol–gel method. GaNFe2O3f-PPY composites are prepared by impregnation technique. Using the SciFinder software we could not trace any report in the literature for this synthesised Ga(2x + 2)NFe2(49 − x)O3-PPY nanocomposites. The doped nanoferrite is combined with polypyrrole, an intrinsic conducting polymer, in three proportions by percentage (70%:30%), (90%:10%) and (97%:3%), to obtain two series each of three compositions for the conducting PPY-nanocomposite. The synthesised polymer composites are characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray analysis and Fourier transform infrared spectroscopy. From our studies, it has been observed that the crystallite size of nanocomposites is decreased when compared to crystallite size of GaNFe2O3. The average particle size from histogram is in good agreement with Debye–Scherrer formula calculations. The scanning electron microscopy and transmission electron microscopy micrograms reveal that the particles are varying with the values of X and the percentage of PPY. The shapes observed are Globules,Tetrahedron,Nanorods of short and long lengths. The GaNFe2O3-PPY composites’ spectra revealed the shift in the band in comparison with the PPY spectra. Also, the wavelength is decreased, and vibrational frequency is increased.

scholarly journals Synthesis and Characterization of Cu2FeSnSe4 Nanofilms

2021 ◽  
pp. 1873-1878
Author(s):  
Omar Abdulsada Ali ◽  
Sarmed S.M. Al-Awadi
Keyword(s):  
Electron Microscopy ◽  
Average Particle Size ◽  
Average Particle ◽  
Electrochemical Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Photovoltaic Applications ◽  
Tem Transmission Electron Microscopy

Well dispersed Cu2FeSnSe4 (CFTSe) nanofilms were synthesized by hot-injection method. The structural and morphological measurements were characterized using XRD (X-ray diffraction), Raman spectroscopy, SEM (scanning electron microscopy), and TEM (transmission electron microscopy). Chemical composition and optical properties of as-synthesized CFTSe nanoparticles were characterized using EDS (energy dispersive spectroscopy) and UV-Vis spectrophotometry. The average particle size of the nanoparticles was about 7-10 nm. The UV-Vis absorption spectra showed that the synthesized CFTS nanofilms have a band gap (Eg) of about 1.16 eV. Photo-electrochemical characteristics of CFTSe nanoparticles were studied and indicated their potential application in photovoltaic applications.

scholarly journals Effective Method for Obtaining the Hydrosols of Detonation Nanodiamond with Particle Size < 4 nm

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1285 ◽  
Author(s):  
Andrei Trofimuk ◽  
Diana Muravijova ◽  
Demid Kirilenko ◽  
Aleksandr Shvidchenko
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Synthetic Diamond ◽  
Average Particle Size ◽  
Average Particle ◽  
Detonation Nanodiamond ◽  
New Approach ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron

Detonation nanodiamond is a commercially available synthetic diamond that is obtained from the carbon of explosives. It is known that the average particle size of detonation nanodiamond is 4–6 nm. However, it is possible to separate smaller particles. Here we suggest a new approach for the effective separation of detonation nanodiamond particles by centrifugation of a “hydrosol/glycerol” system. The method allows for the production of the detonation nanodiamond hydrosol with a very sharp distribution in size, where more than 85% of particles have a size ranging 1–4 nm. The result is supported by transmission electron microscopy, atomic force microscopy, and dynamic light scattering.

IMPACT OF SURFACTANTS ON PHYSICAL PROPERTIES OF BaTiO3 NANOPARTICLES

2013 ◽  
Vol 12 (01) ◽  
pp. 1350003 ◽  
Author(s):  
R. VIJAYALAKSHMI ◽  
V. RAJENDRAN
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Average Particle Size ◽  
Ammonium Bromide ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Nanocrystalline BaTiO3 particles of about 20–35 nm have been successfully synthesized by using cationic, anionic and nonionic surfactants such as cetyltrimethyl ammonium bromide (CTAB), sodium dodecyl sulphate (SDS) and poly ethylene glycol (PEG) via hydrothermal method. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis absorption spectroscopy and photoluminescence (PL) spectroscopy. The average particle size, measured by powder X-ray diffraction was determined to be 20–35 nm and was confirmed by transmission electron microscopy. Spherical-like morphologies were obtained by scanning electron microscopy (SEM) analysis. Optical properties of products were investigated by ultraviolet-visible (UV-Vis) absorption and PL spectroscopies.

ELECTROCHEMICAL SYNTHESIS AND CHARACTERIZATION OF DIFFERENT MORPHOLOGIES NANORAMSDELLITE-MnO2

NANO ◽  
2012 ◽  
Vol 07 (04) ◽  
pp. 1250030
Author(s):  
MADJID TORKAMAN ◽  
AZIZAN AZIZ ◽  
MOHAMAD ABU BAKAR ◽  
SULAIMAN AB GHANI
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Average Particle Size ◽  
Reaction Times ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Crystal Particle

In this work manganese dioxide (Ramsdellite- MnO2 ) was synthesized at room temperature using a facile electrochemical method. X-ray diffraction (XRD) was used to identify the type and the size of the crystal particle, while field emission scanning electron microscopy (FESEM) and energy filtered transmission electron microscopy (EFTEM) were used to show and identify the morphology of the particles and changes of their morphologies with the increase of reaction times. Fourier transform infrared (FTIR) spectroscopy confirmed the Mn–O bond. Results from XRD showed that optimum time for synthesis Ramsdellite- MnO2 was 9 h. The results of EFTEM showed a mixture of nanospheres and nanorods after 9 h reaction time while a homogenous morphology of nanospheres was detected at 12 h reaction time. Results confirmed on the existence of a correlation between the reaction time and the resulting nanostructures. Moreover, the EFTEM result showed that average particle size for 12 h was (25 ± 7 nm). The variation of calculated specific capacitance (F/g) versus the different scan rate has indicated that the efficiency of synthesized Ramsdellite- MnO2 nanostructures in 12 h reaction time was superior to 9 h.

scholarly journals One Step Production of Silver-Copper (AgCu) Nanoparticles

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1466
Author(s):  
Münevver Köroğlu ◽  
Burçak Ebin ◽  
Srecko Stopic ◽  
Sebahattin Gürmen ◽  
Bernd Friedrich
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Reduction ◽  
Average Particle Size ◽  
Antibacterial Properties ◽  
Ultrasonic Spray Pyrolysis ◽  
Solution Concentration ◽  
Average Particle ◽  
X Ray ◽  
Ultrasonic Spray ◽  
Transmission Electron

AgCu nanoparticles were prepared through hydrogen-reduction-assisted Ultrasonic Spray Pyrolysis (USP) and the Hydrogen Reduction (HR) method. The changes in the morphology and crystal structure of nanoparticles were studied using different concentrated precursors. The structure and morphology of the mixed crystalline particles were characterized through X-ray diffraction analysis (XRD), scanning electron microscopy (FEG-SEM), transmission electron microscopy (TEM) and Energy-dispersive X-ray spectroscopy (EDS). The average particle size decreased from 364 nm to 224 nm by reducing the initial solution concentration from 0.05 M to 0.4 M. These results indicate that the increase in concentration also increases the grain size. Antibacterial properties of nanoparticles against Escherichia coli were investigated. The obtained results indicate that produced particles show antibacterial activity (100%). The AgCu nanoparticles have the usage potential in different areas of the industry.

Formation of Water-Soluble Au-Nanobiocomposite with Dielectric Matrix

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940055
Author(s):  
G. Aleksandrova ◽  
B. Sukhov ◽  
B. Trofimov
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Au Nanoparticles ◽  
Average Particle Size ◽  
Water Soluble ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Natural Polysaccharide

Water-soluble potentially biocompatible Au-containing nanocomposites based on the natural polysaccharide arabinogalactan were prepared. They were investigated by electronic and infrared spectroscopies, X-ray diffraction analysis and transmission electron microscopy. Stable zero-valence Au nanoparticles with an average particle size of 5–8[Formula: see text]nm are formed in the natural macromolecular matrix. The nanocomposites obtained are aggregatively stable and of interest for applications in medicine.

A novel organothermal reduction process for producing nanocrystalline Ni2P with a circular-shaped flake morphology

1998 ◽  
Vol 13 (12) ◽  
pp. 3365-3367 ◽  
Author(s):  
Shu-Hong Yu ◽  
Jian Yang ◽  
Yong-Sheng Wu ◽  
Zhao-Hui Han ◽  
Lei Shu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Powder Diffraction ◽  
Average Particle Size ◽  
Reduction Process ◽  
Average Particle ◽  
X Ray ◽  
Transmission Electron ◽  
A Cell

An organothermal reduction process has been successfully developed for synthesis of nanocrystalline Ni2P in benzene at 140 °C. An x-ray powder diffraction pattern (XRD) indicated that the product was pure hexagonal Ni2P phase with a cell constants a =0.5866 and c = 0.3377 nm. Transmission electron microscopy (TEM) showed that the average particle size of the powders was 40 nm with a circular-shaped flake morphology.

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