Identification of the product from the reduction of permanganate ion by trimethylamine in aqueous phosphate buffers

1985 ◽  
Vol 63 (4) ◽  
pp. 988-992 ◽  
Author(s):  
Fernando Mata-Perez ◽  
Joaquin F. Perez-Benito
Keyword(s):  
Manganese Dioxide ◽  
Potassium Permanganate ◽  
Energy Of Activation ◽  
Soluble Form ◽  
Phosphate Ions ◽  
Flocculation Process ◽  
Apparent Energy Of Activation ◽  
Permanganate Ion

The product obtained from the reduction of potassium permanganate by trimethylamine in aqueous phosphate buffers has been identified as a soluble form of colloidal manganese dioxide which is stabilized in solution by adsorption of phosphate ions on its surface. The dependence of the rate of flocculation on several experimental variables has been studied. Phosphate ions have been found to increase the solubility of the colloid by increasing the apparent energy of activation of the flocculation process. This could explain the well-known capacity of those ions for retarding the precipitation of manganese dioxide.

scholarly journals Kinetics and mechanisms of oxidation of methylamine by permanganate ion

1987 ◽  
Vol 65 (10) ◽  
pp. 2373-2379 ◽  
Author(s):  
Fernando Mata-Perez ◽  
Joaquin F. Perez-Benito
Keyword(s):  
Experimental Data ◽  
Manganese Dioxide ◽  
Rate Constants ◽  
Activation Parameters ◽  
Soluble Form ◽  
Phosphate Ions ◽  
Catalytic Mechanisms ◽  
Permanganate Ion

The oxidation of methylamine by permanganate ion in aqueous phosphate buffers is autocatalyzed by a soluble form of colloidal manganese dioxide temporarily stabilized in solution by adsorption of phosphate ions on its surface. The dependence of the rate constants of both the noncatalytic and catalytic mechanisms on the concentrations of both methylammonium and hydroxyl ions and on temperature has been determined. The activation parameters have been obtained. Mechanisms in agreement with the experimental data are proposed.

Green Oxidations. The Use of Potassium Permanganate Supported on Manganese Dioxide.

ChemInform ◽  
2005 ◽  
Vol 36 (13) ◽  
Author(s):  
Ahmad Shaabani ◽  
Peiman Mirzaei ◽  
Soheila Naderi ◽  
Donald G. Lee
Keyword(s):  
Manganese Dioxide ◽  
Potassium Permanganate

Stabilization of potassium permanganate particles with manganese dioxide

Chemosphere ◽  
2012 ◽  
Vol 86 (8) ◽  
pp. 783-788 ◽  
Author(s):  
Klara Rusevova ◽  
Frank-Dieter Kopinke ◽  
Anett Georgi
Keyword(s):  
Manganese Dioxide ◽  
Potassium Permanganate

scholarly journals THE MACROMOLECULAR NATURE OF THE FIRST COMPONENT OF HUMAN COMPLEMENT

1964 ◽  
Vol 119 (4) ◽  
pp. 593-613 ◽  
Author(s):  
George B. Naff ◽  
Jack Pensky ◽  
Irwin H. Lepow
Keyword(s):  
Liquid Phase ◽  
Human Serum ◽  
The State ◽  
Normal Human Serum ◽  
Energy Of Activation ◽  
Subunit Structure ◽  
Human Complement ◽  
Normal Human ◽  
Apparent Energy Of Activation

Kinetic and ultracentrifugal experiments demonstrated that the previously described subcomponents of human C'1, designated C'1q, C'1r, and C'1s, interacted with each other in liquid phase to form a macromolecule which was then capable of converting sensitized erythrocytes (EA) to the state EAC'1. The apparent sedimentation constants of C'1q, C'1r, and C'1s and of the macromolecular product of their interaction were approximately 11S, 7S, 4S, and 18S respectively. Association of C'1 subcomponents was prevented and dissociation of macromolecular C'1 was effected by Na3HEDTA and Na2MgEDTA but not by Na2CaEDTA. The rate of formation of macromolecular C'1 was a function of concentration of subcomponents and temperature of interaction, with an apparent energy of activation of 21,000 calories per mol. Ultracentrifugal studies further indicated the macromolecular nature of C'1 in normal human serum. In the absence of EDTA, C'1 sedimented with the serum macroglobulins and C'1 subcomponents were not detected. Conversely, in the presence of EDTA, macromolecular C'1 was not demonstrable and individual C'1 subcomponents could be measured in lighter fractions. The significance of these observations in relation to previous studies on C'1 subcomponents, the role of Ca++ in C'1 function, and the subunit structure of Enzymes has been discussed.

Influence of Specific Absorbed Microwave Power on Activation Energy of Densification in Ceramic Materials

1996 ◽  
Vol 430 ◽  
Author(s):  
Y. Bykov ◽  
A. Eremeev ◽  
V. Holoptsev
Keyword(s):  
Activation Energy ◽  
Silicon Nitride ◽  
Energy Balance ◽  
Experimental Method ◽  
Microwave Power ◽  
Ceramic Materials ◽  
Energy Of Activation ◽  
Initial Stage ◽  
Microwave Furnace ◽  
Apparent Energy Of Activation

AbstractCorrelation between the rate of densification in powder ceramic materials and specific absorbed microwave power is determined by the experimental method. The approach is based on a comparison of the densification curves obtained at different rates of heating. The changes in the ramping rate are provided by varying the microwave power fed into the microwave furnace. Using the energy balance for the microwave heated samples, the correlation between the apparent energy of activation at the initial stage of densification and the value of the specific microwave power absorbed in heated materials are found. The experiments with silicon nitride-based ceramics allowed to determine the reduction in the value of the activation energy resulted from an increase in the specific absorbed microwave power.

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