Bio-inspired Nickel Oxides Nanoscale Synthesis by using Peel of Citrus Sinensis

MRS Advances ◽  
2020 ◽  
Vol 5 (21-22) ◽  
pp. 1157-1166
Author(s):  
A. Fall ◽  
N. Mayedwa ◽  
R. Bucher ◽  
B. D. Ngom ◽  
M. Maaza
Keyword(s):  
Citrus Sinensis ◽  
Synthesis Method ◽  
Attenuated Total Reflection ◽  
Degree Of Crystallinity ◽  
Face Centered Cubic ◽  
X Rays ◽  
Nickel Oxide Nanoparticles ◽  
Calcination Temperatures ◽  
Face Centered ◽  
Nio Nps

AbstractThis contribution provides the synthesis and characterization of nickel oxide nanoparticles (NiO NPs) which were prepared by green synthesis method using natural extract oranges peel skin (Peel Citrus Sinensis) as an effective bio-oxidizing/bio-reducing agent. The effect of different calcination temperatures on the size of the NiO NPs was investigated. The prepared nanoparticles were characterized by various techniques such as X-rays diffraction (XRD) results indicated that all the samples have a face-centered cubic (FCC) structure and confirmed the presence of high degree of crystallinity nature NiO NPs. The functional group composition of NiO NPs were investigated by using attenuated total reflection-Fourier transform infrared (ART-FTIR), Photoluminescence (PL), and Scanning electron microscopy (SEM).

NOVEL AND COST-EFFECTIVE SYNTHESIS OF SILVER NANOCRYSTALS: A GREEN SYNTHESIS

NANO ◽  
2011 ◽  
Vol 06 (04) ◽  
pp. 295-300 ◽  
Author(s):  
NISHAT ARSHI ◽  
FAHEEM AHMED ◽  
M. S. ANWAR ◽  
SHALENDRA KUMAR ◽  
BON HEUN KOO ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Secondary Phase ◽  
Cost Effective ◽  
Silver Foil ◽  
Face Centered Cubic ◽  
X Rays ◽  
Xrd Pattern ◽  
Average Grain Size ◽  
Vis Spectroscopy ◽  
Face Centered

This paper reports the study on the synthesis and characterization of silver nanocrystals by a two-step synthesis procedure. The first step is the solution-free hand grinding of silver foil and sugar at room temperature for few minutes. The second step is the thermal decomposition of silver/sugar composite to form silver nanocrystals. The as-synthesized silver nanocrystals were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet visible (UV/Vis) spectroscopy, atomic force microscopy (AFM) and transmission electron microscopy (TEM) studies. The XRD pattern showed a face-centered cubic structure (single phase) with high crystallinity. The lattice parameters calculated from XRD pattern were found to be a = 4.12 Å for silver nanocrystals with average grain size of ~ 19 nm. The energy dispersive analysis of X-rays (EDAX) of silver nanocrystals confirmed the presence of silver and no peak of any secondary phase was detected. FESEM and AFM studies showed that the crystals have cube-like morphology. TEM results showed that the size of silver nanocrystals was found to be ~ 22 nm. This novel synthesis route, not reported earlier, would be a promising candidate for a variety of future applications of silver nanocrystals.

The Influence of the Synthesis Method on the Formation of Phase Composition and Catalytic Centers Gd2Zr2O7

2020 ◽  
Vol 1009 ◽  
pp. 69-74
Author(s):  
Ekaterina Borisovna Markova ◽  
Alexander Genrihovich Cherednichenko ◽  
V.V. Kurilkin ◽  
J.M. Serov
Keyword(s):  
Crystal Structure ◽  
Synthesis Method ◽  
Nanocrystalline Powders ◽  
Face Centered Cubic ◽  
Cubic Crystal ◽  
Wide Range ◽  
Physicochemical Methods ◽  
Degradation Reaction ◽  
Cubic Structure ◽  
Face Centered

The influence of the type of crystal structure of complex gadolinium oxides on their catalytic activity was studied using a wide range of physicochemical methods. It was shown that the synthesized nanocrystalline powders Gd2Zr2O7 form highly symmetric face-centered cubic crystal structures. In the course of catalytic experiments, it was found that the formation of a cubic structure increases the degree of conversion of propane and the shift of cracking temperatures to a lower area. The formation of various defects contributes to the course of the dehydrogenation or degradation reaction due to the different number of catalytic centers.

High-Gravity-Assisted Green Synthesis of NiO-NPs Anchored on the Surface of Biodegradable Nanobeads with Potential Biomedical Applications

2020 ◽  
Vol 16 (4) ◽  
pp. 520-530 ◽  
Author(s):  
Navid Rabiee ◽  
Mojtaba Bagherzadeh ◽  
Amir Mohammad Ghadiri ◽  
Mahsa Kiani ◽  
Sepideh Ahmadi ◽  
...  
Keyword(s):  
Antioxidant Activities ◽  
Biological Activities ◽  
Synthesis Method ◽  
Packed Bed ◽  
High Gravity ◽  
Leaf Extracts ◽  
Nickel Oxide Nanoparticles ◽  
Synthesis Of Nanoparticles ◽  
Rotating Packed Bed ◽  
Nio Nps

Here, an unprecedented synthesis method for nickel oxide nanoparticles (NiO-NPs) was facilitated using Salvia hispanica leaf extracts with the assistance of a high gravity rotating packed bed (RPB) system that enabled fast mass transfer and molecular mixing. The synthesized nanoparticles were anchored on the surface of biodegradable chitosan nanobeads and their photocatalytic activity was evaluated by the degradation of methylene blue. Additionally, the potential biological activities of NiO-NPs in terms of antibacterial (Staphylococcus aureus and Escherichia coli for 24 hours), cytotoxicity (using the PC12 cell line for 24 and 72 hours), and antioxidant activities (based on the discoloration of the methanolic solution of DPPH) were assessed. This novel approach for NiO-NPs@Chitosan synthesis as mediated by a renewable plant extract and facilitated by a high-gravity method, led to the greener synthesis of nanoparticles with significant antibacterial and photocatalytic properties.

On the Use of Moringa Oleifera Leaves Extract for the Biosynthesis of NiO and ZnO Nanoparticles

MRS Advances ◽  
2020 ◽  
Vol 5 (21-22) ◽  
pp. 1145-1155
Author(s):  
I. Ngom ◽  
N. M. Ndiaye ◽  
A. Fall ◽  
M. Bakayoko ◽  
B. D. Ngom ◽  
...  
Keyword(s):  
Moringa Oleifera ◽  
Diffuse Reflectance ◽  
Average Crystallite Size ◽  
Zinc Nitrate ◽  
Attenuated Total Reflection ◽  
Nitrate Hexahydrate ◽  
X Rays ◽  
Zno Nps ◽  
Moringa Oleifera Leaves ◽  
Nio Nps

ABSTRACTThis contribution reports on the biosynthesis of nickel oxide and zinc oxide nanoparticles (NiO-NPs & ZnO-NPs) via a natural extract from Moringa Oleifera leaves as an effective chelating and/or oxidizing/reduction agent of nickel nitrate hexahydrate and zinc nitrate hexahydrate. The structural and optical properties of these two types of semiconductors obtained in a similar procedure are investigated using X-rays Diffraction (XRD), Attenuated Total Reflection-Fourier Transform Infrared (ATR-FTIR), diffuse reflectance UV-Visible-NIR and Photoluminescence (PL) techniques. The structural analysis shows the formation of pure cubic NiO-NPs and pure wurtzite ZnO-NPs with an average crystallite size of 17.80 nm and 10.81 nm respectively. Their band gaps, calculated from the diffuse reflectance analysis were found to be 4.28 eV and 3.35 eV respectively.

scholarly journals Synthesis of Non-Cubic Nitride Phases of Va-Group Metals (V, Nb, and Ta) from Metal Powders in Stream of NH3 Gas under Concentrated Solar Radiation

2021 ◽  
Vol 5 (2) ◽  
pp. 19
Author(s):  
Nobumitsu Shohoji ◽  
Fernando Almeida Costa Oliveira ◽  
José Galindo ◽  
José Rodríguez ◽  
Inmaculada Cañadas ◽  
...  
Keyword(s):  
Lattice Structure ◽  
Solar Furnace ◽  
Degree Of Crystallinity ◽  
Nitride Phase ◽  
Face Centered Cubic ◽  
Metal Powders ◽  
Group Metal ◽  
Ε Phase ◽  
Δ Phase ◽  
Face Centered

Using a high-flux solar furnace, loosely compacted powders of Va-group transition metal (V, Nb, and Ta) were reacted with stream of NH3 gas (uncracked NH3 gas) being heated by concentrated solar beam to a temperature (T) range between 600 and 1000 °C. From V, sub-nitride V2N (γ phase) and hypo-stoichiometric mono-nitride VN possessing fcc (face-centered cubic) crystal lattice structure (δ phase) were synthesized. On the other hand, in the reaction product from Nb and Ta, hexagonal mono-nitride phase with N/M atom ratio close to 1 (ε phase) was detected. The reaction duration was normalized to be 60 min. In a conventional industrial or laboratory electric furnace, the synthesis of mono-nitride phase with high degree of crystallinity that yield sharp XRD peaks for Va-group metal might take a quite long duration even at T exceeding 1000 °C. In contrast, mono–nitride phase MN of Va-group metal was synthesized for a relatively short duration of 60 min at T lower than 1000 °C being co-existed with lower nitride phases.

scholarly journals STUDY ON INFLUENCE OF TEMPERATURE AND DURATION OF HYDROTHERMAL TREATMENT TO PROPERTIES OF NANO FERRITE NiFe2O4 MATERIALS

2018 ◽  
Vol 54 (1A) ◽  
pp. 1 ◽  
Author(s):  
Tran Quang Dat
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Hydrothermal Treatment ◽  
Superparamagnetic Nanoparticles ◽  
Degree Of Crystallinity ◽  
Face Centered Cubic ◽  
Influence Of Temperature ◽  
Face Centered ◽  
Co Precipitation ◽  
Increasing Temperature

NiFe2O4 superparamagnetic nanoparticles have been prepared by the method of spraying - co-precipitation subsequent by hydrothermal treatment. This procedure allowed to produce efficiently nanoparticles with high performances. Different techniques such as XRD, TEM, EDX, VSM were used to investigate the morphology, structure and magnetic properties of the obtained materials. It is shown that the materials have face-centered cubic trevorite structure, and their degree of crystallinity and magnetic properties improved with increasing temperature and time of hydrothermal treatment. After 32 hours of hydrothermal treatment at 160°C, NiFe2O4 nanomaterial has particle size of about 23 nm and saturation magnetization (Ms) of 49 emu/g.

scholarly journals On the determination of the crystal-axes in "single-crystal" aluminium bars by means of X-rays

1924 ◽  
Vol 105 (733) ◽  
pp. 500-506 ◽  
Keyword(s):  
Single Crystal ◽  
Test Piece ◽  
Lattice Structure ◽  
General Interest ◽  
Face Centered Cubic ◽  
X Rays ◽  
Test Pieces ◽  
Slip Planes ◽  
Face Centered

Mr. G. I. Taylor, F. R. S., and Miss C. F. Elam investigated recently the distortion of "single-crystal" aluminium bars during a tensile test. By purely geometrical measurements they found that certain planes exist in the test-piece which, during its extension, remain undistorted. That is to say, that any curve drawn on these planes keeps its shape. From these observations they concluded that the test-piece must have a lattice-structure extending through the bulk of the material, or, in other words, that these test-pieces are single crystals. Mr. Taylor asked the writer to investigate by means of X-rays whether the "undistorted" or slip-planes could be related with the crystal-planes of the material which is known to crystallize in a face-centered cubic lattice. The result of this investigation is given in the above-mentioned paper of Taylor and Elam. The present paper is meant to give an account of the experiments so far as the X-ray work is concerned. A few points will be discussed later on which are likely to be of a more general interest.

ROLE OF CALCINATION TEMPERATURES ON THE STRUCTURAL AND OPTICAL PROPERTIES OF NiO NANOPARTICLES

2019 ◽  
Vol 26 (08) ◽  
pp. 1950043
Author(s):  
H. MOHAMED MOHAIDEEN ◽  
S. SHEIK FAREED ◽  
B. NATARAJAN
Keyword(s):  
Optical Properties ◽  
Sol Gel ◽  
Near Band Edge ◽  
Band Edge Emission ◽  
Nickel Oxide Nanoparticles ◽  
Tem Analysis ◽  
Calcination Temperatures ◽  
Peak Broadening ◽  
Strain Components ◽  
Nio Nps

Nickel oxide nanoparticles (NiO NPs) were synthesized through template free sol–gel method. Synthesized particles were calcined at 300∘C, 500∘C and 700∘C for 2[Formula: see text]h and further the particles were characterized for its thermal, functional, structural, morphological and optical properties. The peak broadening analysis was undertaken in order to calculate the variation in size and strain components of the particles with the calcinations temperature. The Debye–Scherer, Williamson–Hall and Size-strain plot methods were employed in peak broadening analysis and were compared with TEM results. All the NiO NPs crystallite size and lattice strain value were found to be in good agreement with all the models. The TEM analysis revealed that the calcinations at 700∘C NiO NPs have sphere like structure of less than 20[Formula: see text]nm particles size value. The strong peak observed at 360.5[Formula: see text]nm bandgap emission relates to the bandgap of 3.44[Formula: see text]eV which is because of the near band edge emission.

scholarly journals Growth and Characterization of Electroplated NiO Coatings

2014 ◽  
Vol 17 (3) ◽  
pp. 173-177
Author(s):  
B. Bharathi ◽  
S. Thanikaikarasan ◽  
Pratap Kollu ◽  
P. V. Chandrasekar ◽  
T. Mahalingam ◽  
...  
Keyword(s):  
Face Centered Cubic ◽  
X Rays ◽  
X Ray Diffraction ◽  
X Ray ◽  
Potentiostatic Electrodeposition ◽  
Direct Band ◽  
Diffraction Patterns ◽  
Face Centered ◽  
Deposited Films

Thin films of NiO have been prepared using potentiostatic electrodeposition technique from an aqueous electrolytic bath containing NiSO4. Deposited films have been characterized using x-ray diffraction, scanning electron microscopy and energy dispersive analysis by x-rays. X-ray diffraction patterns showed that the prepared films possess polycrystalline nature with face centered cubic structure. Surface morphology and film composition showed that films with better stoichiometry and smooth surface are obtained at optimized growth condition. Optical absorption analysis showed that the prepared films possess direct band gap value around 3.46 eV.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

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