Influence of oxide bond energies on the kinetics of chemical dissolution of anodic oxides on valve metals

1988 ◽  
Vol 18 (4) ◽  
pp. 532-537 ◽  
Author(s):  
A. G. Gad-Allah ◽  
H. A. Abd El-Rahman ◽  
M. M. Abou-Romia
Keyword(s):  
Chemical Dissolution ◽  
Bond Energies ◽  
Valve Metals ◽  
Kinetics Of

scholarly journals Zero Stress Aging of Glass and Carbon Fibers in Water and Oil—Strength Reduction Explained by Dissolution Kinetics

Fibers ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 107 ◽  
Author(s):  
Andreas T. Echtermeyer ◽  
Andrey E. Krauklis ◽  
Abedin I. Gagani ◽  
Erik Sæter
Keyword(s):  
Carbon Fibers ◽  
Fiber Strength ◽  
Glass Fibers ◽  
Dissolution Kinetics ◽  
Strength Degradation ◽  
Strength Reduction ◽  
Chemical Dissolution ◽  
Structural Applications ◽  
Kinetics Of ◽  
Over Time

Understanding the strength degradation of glass and carbon fibers due to exposure to liquids over time is important for structural applications. A model has been developed for glass fibers that links the strength reduction in water to the increase of the Griffith flaw size of the fibers. The speed of the increase is determined by regular chemical dissolution kinetics of glass in water. Crack growth and strength reduction can be predicted for several water temperatures and pH, based on the corresponding dissolution constants. Agreement with experimental results for the case of water at 60 °C with a pH of 5.8 is reasonably good. Carbon fibers in water and toluene and glass fibers in toluene do not chemically react with the liquid. Subsequently no strength degradation is expected and will be confirmed experimentally. All fiber strength measurements are carried out on bundles. The glass fibers are R-glass.

Generalization of the kinetics of chemical dissolution under conditions of gas formation

1986 ◽  
Vol 50 (5) ◽  
pp. 563-565
Author(s):  
G. A. Aksel'rud ◽  
A. I. Dubynin ◽  
B. I. Duda
Keyword(s):  
Chemical Dissolution ◽  
Gas Formation ◽  
Kinetics Of

Bond energies in polyunsaturated acids and kinetics of co-oxidation of protiated and deuterated acids

2016 ◽  
Vol 90 (10) ◽  
pp. 1936-1941 ◽  
Author(s):  
Z. S. Andrianova ◽  
N. N. Breslavskaya ◽  
E. M. Pliss ◽  
A. L. Buchachenko
Keyword(s):  
Co Oxidation ◽  
Bond Energies ◽  
Polyunsaturated Acids ◽  
Kinetics Of

Comparison of H2 Desorption Kinetics from Si(111)7×7 and Si(100)2×l

1990 ◽  
Vol 204 ◽  
Author(s):  
M. L. Wise ◽  
B. G. Koehler ◽  
P. Gupta ◽  
P. A. Coon ◽  
S. M. George
Keyword(s):  
Activation Energy ◽  
Preexponential Factor ◽  
Desorption Kinetics ◽  
Bond Energies ◽  
First Order ◽  
First Order Kinetics ◽  
Upper Limits ◽  
Desorption Activation Energy ◽  
Temperature Programmed ◽  
Kinetics Of

ABSTRACTThe desorption kinetics of hydrogen from the β1 H2 -TPD state on Si(111)7×7 and Si(100)2×l were studied using laser-induced thermal desorption (LITD) and temperature programmed desorption (TPD) techniques. Isothermal LITD studies of H2 desorption from Si(111)7×7 revealed second-order kinetics with a desorption activation energy of Ed = 62 ±4 kcal/mol and a preexponential factor of Vd = 92 ±10 cm2 /s. In contrast, H2 desorption from Si(100)2×l revealed first-order kinetics with an activation energy of Ed = 58 ±2 kcal/mol and a preexponential factor of Vd = 5.5 ±0.5 × 1015 s−1. The desorption kinetics yield similar upper limits for the Si-H bond energies but different desorption mechanisms on Si(lll)7×7 and Si(100)2×l.

Determination of the Bond Strength Between Nanosized Particles

1994 ◽  
Vol 351 ◽  
Author(s):  
Alfred P. Weber ◽  
Sheldon K. Friedlander
Keyword(s):  
Free Energy ◽  
Bond Strength ◽  
Gibbs Free Energy ◽  
Nanosized Particles ◽  
Bond Energies ◽  
Method Of Calculation ◽  
Order Of Magnitude ◽  
Hamaker Constants ◽  
Kinetics Of

ABSTRACTA method has been developed for determining the bond energies between nanosized particles from the kinetics of the rearrangement of aerosol agglomerates. The method of calculation is based on the change in Gibbs' free energy during restructuring. For Ag and Cu agglomerates, bond energies between the nanosized particles are of the order of magnitude calculated from bulk Hamaker constants.

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