Effects of particle size and synthesis temperature on the structural properties of the Ni nanoparticles: Insights about the formation of the fcc-Ni structure

2009 ◽  
Author(s):  
Edvaldo Alves de Souza ◽  
Hebert Winnischofer ◽  
Paula Haddad ◽  
Tulio C. R. Costa ◽  
Daniela Zanchet ◽  
...  
Keyword(s):  
Particle Size ◽  
Structural Properties ◽  
Synthesis Temperature ◽  
Ni Nanoparticles

Structural properties of spherical Cu/Ni nanoparticles

CrystEngComm ◽  
2012 ◽  
Vol 14 (22) ◽  
pp. 7633 ◽  
Author(s):  
M. Hennes ◽  
J. Buchwald ◽  
S. G. Mayr
Keyword(s):  
Structural Properties ◽  
Ni Nanoparticles

Synthesis Route towards Fine and Monodisperse Ni Nanoparticles via Hot-Injection Approach

2013 ◽  
Vol 393 ◽  
pp. 146-151 ◽  
Author(s):  
N.R. Nik Roselina ◽  
Aziz Azizan ◽  
Koay Mei Hyie ◽  
C.M. Mardziah ◽  
Salmiah Kasolang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Size Distribution ◽  
Reaction Rate ◽  
Fine Particles ◽  
Synthesis Temperature ◽  
Ni Nanoparticles ◽  
One Pot ◽  
Transmission Electron ◽  
Hot Injection

Manipulation of adding sequences have been found to influence the reaction rate, thus made it easier to produced controllable Ni nanoparticles. Hot-injection approach shown capability to significantly reduce the production time of Ni nanoparticles compared to the conventional one-pot synthesis. With minor modification on conventional polyol method, narrow, monodispersed and highly yield spherical nickel (Ni) nanoparticles were successfully produced at synthesis temperature of 60°C. Three mixing methods were investigated to study its efficiency towards producing rapid and narrower size distribution of Ni nanoparticles. Reduction processes were proposed each of the method. As-synthesized Ni nanoparticles were characterized with Transmission Electron Microscopy (TEM), Scanning Transmission Electron Microscopy (STEM) and Fourier transform infrared spectroscopy (FTIR) to analyze the size, morphology and interaction of reactants. Fine particles size distribution revealed that when hydrazine was first heated, reaction rate improved tremendously.

Influence of particle size and dielectric environment on the dispersion behaviour and surface plasmon in nickel nanoparticles

2017 ◽  
Vol 19 (21) ◽  
pp. 14096-14106 ◽  
Author(s):  
Vikash Sharma ◽  
Chanderbhan Chotia ◽  
Tarachand Tarachand ◽  
Vedachalaiyer Ganesan ◽  
Gunadhor S. Okram
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Surface Plasmon ◽  
Nickel Nanoparticles ◽  
Ni Nanoparticles ◽  
Uv Visible ◽  
Dielectric Environment

Schematic showing the effect of the dielectric environment on the zeta potential and UV-visible absorbance of monodispersed Ni nanoparticles.

Luminescent properties and the morphology of SrMoO4:Eu3+ powders synthesized via combining sol-gel and solid-state route

Open Physics ◽  
2010 ◽  
Vol 8 (5) ◽  
Author(s):  
Qiong Wei ◽  
Donghua Chen
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Ethylenediaminetetraacetic Acid ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Synthesis Temperature ◽  
X Ray Diffraction ◽  
Red Phosphors ◽  
Solid State Route ◽  
Metal Nitrates

AbstractSrMoO4:Eu3+ red phosphors were prepared by combining sol-gel and solid-state route. Citric acid and ethylenediaminetetraacetic acid (EDTA), employed as the chelating agents, were added to the aqueous solutions of metal nitrates. X-ray diffraction (XRD) and photoluminescent spectra techniques (PL) were used to characterize the resultant powders. The results indicated the obtained SrMoO4:Eu3+ phosphors were fine powders with a particle size of 50 nm. The effects of synthesizing conditions were also investigated and optimized, which included the synthesis temperature and the activator concentration on the luminescent intensity. Compared with SrMoO4:Eu3+ phosphors prepared by Solid-state reaction SrMoO4:Eu3+ phosphors prepared by combining sol-gel and solid-state route showed appropriate particle size and a higher emission intensity.

Scalable Production of Carbon Encapsulated Ni Nanoparticles by Water Arc Discharge: Structural and Magnetic Properties

2005 ◽  
Vol 23 ◽  
pp. 87-90 ◽  
Author(s):  
K.H. Ang ◽  
I. Alexandrou ◽  
N.D. Mathur ◽  
R. Lacerda ◽  
I.Y.Y. Bu ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Arc Discharge ◽  
Narrow Particle Size Distribution ◽  
Ni Nanoparticles ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Water Container

An electric arc discharge in de-ionised water between a solid graphite cathode and an anode made by compressing Ni and C containing powders in a mass ratio of Ni:C = 7:3 was used here to prepare carbon encapsulated Ni nanoparticles in the form of powder suspended in water. The morphology of the produced material was analysed using high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The magnetic properties of the samples were determined using a Princeton vibrating sample magnetometer (VSM). Collection of the powder produced from different depths in the water container has proved to be an effective method for obtaining samples with narrow particle size distribution. Further material purification by dry NH4 plasma etching was used to remove the amorphous carbon content of the samples. XRD and HRTEM analysis showed that the material synthesized is fcc Ni particles with mean particle size ranging from 14 to 30 nm encapsulated in 2 to 5 graphitic cages. The data suggests that the process reported has the ability to mass-produce carbon encapsulated ferromagnetic nanoparticles with desired particle size distribution, and hence with controlled size-dependent magnetic properties.

Synthesis and sintering of SiC under high pressure and high temperature

1999 ◽  
Vol 14 (3) ◽  
pp. 906-911 ◽  
Author(s):  
S. K. Bhaumik ◽  
C. Divakar ◽  
S. Usha Devi ◽  
A. K. Singh
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
High Pressure ◽  
Silicon Powder ◽  
Synthesis Temperature ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microscopic Studies ◽  
Simultaneous Synthesis

Starting from elemental powders, simultaneous synthesis and compaction of SiC were conducted at 3 GPa pressure and temperatures in the range 2100–2900 K. The sintered compacts were characterized by x-ray diffraction, microhardness measurements, and microscopic studies. The efficiency of formation of SiC was dependent on the particle size of the silicon powder, crystallinity of the reactant carbon, molar ratio of silicon and carbon, and synthesis temperature and time. Carbon in excess of the stoichiometric amount was required to obtain compacts free from residual silicon. The SiC samples, with a Si: C molar ratio 1: 1.05, prepared at 2100 K for 300 s had a density and hardness of 3.21 g/cm3 (98.8% of theoretical density) and 22 GPa, respectively. The crystal structure of the SiC depended on the synthesis temperature. Pure β–SiC in the temperature range 2100–2500 K, and a mixture of α– and β–SiC above 2500 K were obtained. The β–SiC was highly crystalline and nearly defect-free.

STRUCTURAL PROPERTIES OF NANOCRYSTALLINE Ni–Al SPINEL FERRITES

2011 ◽  
Vol 25 (08) ◽  
pp. 1121-1125 ◽  
Author(s):  
A. T. RAGHAVENDER
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Structural Properties ◽  
Lattice Constant ◽  
Reaction Mechanisms ◽  
Sol Gel ◽  
Ftir Analysis ◽  
X Ray ◽  
Al Content ◽  
Ftir Spectrometer

Ultra fine NiAl x Fe 2-x O 4(0 ≤ x ≤ 1) nanopowders were synthesized by sol-gel method and their structural properties were investigated using X-ray diffractometer (XRD) and fourier transform infrared (FTIR) spectrometer. The particle size D, lattice constant a, density dx decreased with increasing non-magnetic Al content x. The combustion reaction mechanisms were explained with the help of FTIR analysis.

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