The Kinetics of Calcium Formate Pyrolysis in Potassium Bromide Matrix1

1965 ◽  
Vol 69 (2) ◽  
pp. 583-589 ◽  
Author(s):  
K. O. Hartman ◽  
I. C. Hisatsune
Keyword(s):  
Potassium Bromide ◽  
Calcium Formate ◽  
Kinetics Of

Electrical conductivity of fused lead bromide + potassium bromide mixtures

1973 ◽  
Vol 26 (4) ◽  
pp. 739 ◽  
Author(s):  
EA Jeffery ◽  
T Mole
Keyword(s):  
Electrical Conductivity ◽  
Initial Rate ◽  
Potassium Bromide ◽  
Methyl Groups ◽  
Alternative Mechanism ◽  
Lead Bromide ◽  
Kinetics Of ◽  
Monomer Pair

Bridge-terminal exchange of methyl groups in trimethylaluminium dimer and the exchange of methyl groups between the dimer and trimethylgallium or dimethylzinc are all interpreted as proceeding by initial rate-determining dissociation of the trimethyl-aluminium dimer to liquid-caged monomer pair. Most exchange occurs before the monomers of the pair become separated. An alternative mechanism in which exchange follows separation is rejected. ��� The choice of mechanism is based on (a) p.m.r. kinetics of exchange between trimethylgallium and trimethylaluminium in cyclopentane; (b) p.m.r. kinetics of exchange between dimethylzinc and trimethylaluminium in cyclopentane; and (c) estimates of the rate of recombination of trimethylaluminium monomer.

Kinetics of oxalate ion pyrolysis in a potassium bromide matrix

1967 ◽  
Vol 71 (2) ◽  
pp. 392-396 ◽  
Author(s):  
Kenneth Owen Hartman ◽  
Isamu C. Hisatsune
Keyword(s):  
Potassium Bromide ◽  
Kinetics Of ◽  
Oxalate Ion

Crosslinking of Gelatin in the Reaction with Formaldehyde: An FT-IR Spectroscopic Study

1996 ◽  
Vol 50 (10) ◽  
pp. 1314-1318 ◽  
Author(s):  
T. Salsa ◽  
M. E. Pina ◽  
J. J. C. Teixeira-Dias
Keyword(s):  
Principal Component Regression ◽  
Principal Component ◽  
Potassium Bromide ◽  
Crosslinking Reaction ◽  
Spectral Changes ◽  
Principal Component Regression Analysis ◽  
Ft Ir ◽  
Ir Spectroscopic ◽  
Kinetics Of ◽  
Ft Ir Spectroscopy

The reaction of an aqueous solution of formaldehyde with gelatin dispersed in a potassium bromide pellet is monitored in real time by FT-IR spectroscopy. Principal component regression analysis of the spectra recorded at different times is carried out. On the whole, the latter results and the observed spectral changes are in agreement with a previously reported interpretation for the kinetics of the crosslinking reaction of gelatin with formaldehyde, according to which the reaction is initialized by the lysine–methylol formation and is subsequently followed by arginine–methylol, which, in turn, reacts with lysine–methylol to originate arginine–lysine crosslinks.

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

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