Results 221 to 230 of about 105,813 (262)

The Pre-exponential Factor in Electrochemistry

Angewandte Chemie - International Edition, 2018
AbstractLike many branches of science, not to mention culture in general, electrochemistry has a number of recurring topics: Areas of research that are popular for a certain time, then fade away as their possibilities seem to have been exhausted, only to return decades later as progress in experimental or theoretical techniques offer new possibilities ...
Yan-Xia Chen, Elizabeth Santos, Wolfgang Schmickler   +2 more
exaly   +3 more sources

Reactive-diffusive equation with variable pre-exponential factor

Mechanics Research Communications, 2004
The author considers a steady state problem for the temperature in a 1D slab with a variable pre-exponential factor. This models an exothermic chemical reaction with an Arrhenius term multiplied by a variable pre-exponential factor. After some transformations of the original problem, he is faced to the second-order nonlinear differential equation: \[ d^
Samuel S Okoya
exaly   +3 more sources

On the Pre-Exponential Factor in Stress Relaxation

Physica Status Solidi (a), 1978
It is shown that, for stress relaxation, the pre-exponential factor in the usual flow rate formulae based on the stress-aided thermal activation concept increases linearly with the initial effective stress. Experimental examples are presented for both metallic and polymeric solids, mainly at room temperature.
J. Kubát, M. Rigdahl, R. Seldén
openaire   +1 more source

Pre-exponential Factor in Hydrogen Abstraction Reactions

Russian Chemical Reviews, 1972
The principal rules governing the variation in the pre-exponential factor in reactions involving the abstraction of hydrogen by atoms and radicals are examined using the activated complex theory. 205 references.
M V Bazilevskii, E A Trosman
openaire   +1 more source

Pre-exponential Factor in Semiconducting Organic Substances

The Journal of Chemical Physics, 1968
Experimental data on semiconducting organic substances are usually processed by use of the two-constant equation, σ(T) = σ0exp(−E / 2kT). Evidence from a number of cases now indicates that σ0 is dependent on E, when the equation is applied to certain single substances where E varies with preparation.
Barnett Rosenberg, Benoy B. Bhowmik, Harold C. Harder, Elliot Postow   +3 more
openaire   +1 more source

The coverage dependence of the pre-exponential factor for desorption

Surface Science, 1988
Abstract The pre-exponential factor for desorption υ 0 is seldom measured as other than low surface coverage θ and is typically assumed to be independent of θ. Variations in υ 0 with θ are critically important in describing surface equilibrium and rate processes and in testing theories of desorption. It has often been overlooked that the functional
E.G. Seebauer, A.C.F. Kong, L.D. Schmidt
openaire   +1 more source

Kinetics of graphitization—II. Pre-exponential factors

Carbon, 1969
Abstract In the preceding article on kinetics of graphitization it has been demonstrated that for three typical cokes used industrially, the activation energy for graphitization is the same and is equal to 230 ± 15 kcals/mol. However, in contrast to work done elsewhere, it is shown that systematic differences in respective rates of graphitization of ...
H.N. Murty, D.L. Biederman, E.A. Heintz
openaire   +1 more source

The impact of overpotential on the enthalpy of activation and pre-exponential factor of electrochemical redox reactions

Physical Chemistry Chemical Physics, 2022
The energetics of the electrochemical, electro-inhibiting and electrocatalytic reactions as a function of overpotential.
Anand Kumar Tripathi, Divya Priyadarshani, Miji E Joy, Rajan Maurya, Manoj Neergat   +4 more
openaire   +2 more sources