A design of a nanometer size metal particle generator: Thermal decomposition of metal carbonyls

1999 ◽  
Vol 70 (11) ◽  
pp. 4366-4369 ◽  
Author(s):  
S. H. Huh ◽  
S. J. Oh ◽  
Y. N. Kim ◽  
G. H. Lee
Keyword(s):  
Thermal Decomposition ◽  
Metal Particle ◽  
Metal Carbonyls ◽  
Nanometer Size ◽  
Particle Generator

Theoretical views on Szilard Chalmers reactions in solid systems. II. Parent reformation by billiard-ball collisions

1968 ◽  
Vol 46 (20) ◽  
pp. 3201-3209 ◽  
Author(s):  
W. H. Wong ◽  
D. R. Wiles
Keyword(s):  
Experimental Data ◽  
Thermal Decomposition ◽  
Initial Energy ◽  
Projectile Energy ◽  
Metal Carbonyls ◽  
Present Stage ◽  
Complex Ions ◽  
Billiard Ball ◽  
Lower Limits ◽  
Mathematical Operations

The problem of billiard-ball replacement reactions of atoms centrally located in the molecule has been approached, using the approximation of simple two-body collisions. The reentry process has been separated into steps which can be handled by straightforward mathematical operations. Collision diameters for given energy transfer were calculated using an exponentially screened potential.Species treated include dicyclopentadienyl metals, arene metal carbonyls, and hexacoordinated complex ions, although the method is applicable to many other types of compound. An important result is that the probability of successful billiard-ball replacement is not sensitive to the initial energy, as long as this is not too low. It is concluded that this method is, at its present stage, most useful in calculating lower limits for billiard-ball reformation by following the projectile energy down to ca. 100 eV. Below this energy it is considered that thermal decomposition of the reformed molecule is likely. Results of the calculation are compared with experimental data, and further experiments are suggested by which the contribution of billiard-ball collisions may be directly assessed.

scholarly journals Thermal Decomposition of 3-Nitro-1,2,4-Triazole-5-One (NTO) and Nanosize NTO Catalyzed by NiFe2O4

2022 ◽  
Author(s):  
Pragnesh N. Dave ◽  
Ruksana Sirach ◽  
Riddhi Thakkar ◽  
Shalini Chaturvedi
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Nickel Catalyst ◽  
Nickel Ferrite ◽  
Peak Temperature ◽  
Kinetics Parameters ◽  
Exponential Factor ◽  
Nanometer Size ◽  
Co Precipitation

Abstract Nanosize Nickel ferrite (NiF) was synthesized by the co-precipitation methods and its effect as a 5 % by mass additive was studied on the thermal decomposition of micrometer and nanometer size NTO. In the presence of 5 % NiF additive, the thermal decomposition peak temperature of NTO was decreased from 276.36 to 260.18 oC and that of nano NTO was decreased from 261.38 to 258.89 oC (β=10 oC min-1). The kinetics parameters confirms the catalytic activity of NiF for the thermal decomposition of NTO, and nNTO as the parameters such as activation energy (NTO=~25.45 % and nNTO=~45.94 % decrement), and pre-exponential factor (NTO=~21.94 % and nNTO=~43.12 % decrement) were decreased when 5 % NiF additive was added to NTO, and nNTO. The rate of the decomposition process was increased in the presence of 5 % NiF catalyst, indicating the faster thermal decomposition of both NTO, and nNTO in the presence of nickel catalyst.

Thermal decomposition of metal carbonyls on oxide supports containing surface hydrides: A route to highly dispersed metal catalysts with unusual properties

1989 ◽  
Vol 55 (1) ◽  
pp. 235-258 ◽  
Author(s):  
A.S. Lisitsyn ◽  
A.V. Golovin ◽  
A.L. Chuvilin ◽  
V.L. Kuznetsov ◽  
A.V. Romanenko ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Metal Catalysts ◽  
Metal Carbonyls ◽  
Oxide Supports ◽  
Highly Dispersed

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

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