scholarly journals Influence of Vacancy Sources and Sinks on the Kinetics of the Reaction Diffusion in a Binary System

2016 ◽  
Vol 37 (10) ◽  
pp. 1297-1311
Author(s):  
S. V. Kornienko ◽  
◽  
A. M. Gusak ◽  
Keyword(s):  
Binary System ◽  
Reaction Diffusion ◽  
Sources And Sinks ◽  
Kinetics Of

Determining the Kinetics of Asphaltene Adsorption from Toluene: A New Reaction–Diffusion Model

2017 ◽  
Vol 31 (9) ◽  
pp. 9101-9116 ◽  
Author(s):  
Sophie Campen ◽  
Luca di Mare ◽  
Benjamin Smith ◽  
Janet S. S. Wong
Keyword(s):  
Diffusion Model ◽  
Reaction Diffusion ◽  
Reaction Diffusion Model ◽  
Kinetics Of

scholarly journals Adsorption studies of Mo and Vonto ferrihydrite

2008 ◽  
Vol 72 (1) ◽  
pp. 385-388 ◽  
Author(s):  
L. Brinza ◽  
L. G. Benning ◽  
P. J. Statham
Keyword(s):  
Binary System ◽  
Binding Sites ◽  
Point Of Zero Charge ◽  
High Uptake ◽  
Adsorption Efficiency ◽  
Adsorption Studies ◽  
Ph Values ◽  
Zero Charge ◽  
Kinetics Of

AbstractIn this paper, the kinetics of Mo and V (100 μM) uptake on ferrihydrite (FHY) were evaluated in batch, mono-sorbate systems at pH between 4 and 9, and in bi-sorbate systems in the presence of P (100 μM) at pH 7. In the Mo and V single-sorbate experiments, 100% adsorption was observed at pH values below 6 and 8, respectively. Above the point of zero charge (PZC = 7.97) of FHY, the adsorption efficiency for Mo dropped dramatically (20% at pH 8) while V showed high uptake efficiencies even at pH 9 (60% efficiency). The results from the bi-sorbate experiments (Mo-P and V-P) showed that at pH 7, P out-competed (97%) Mo for binding sites on FHY, while in the V-P binary system only ∼44% of the binding sites are occupied by P with the remaining sites being occupied by V.

Thermodynamic Structure of Nonlinear Macrokinetics in Reaction-Diffusion Systems

2004 ◽  
Vol 11 (02) ◽  
pp. 185-202 ◽  
Author(s):  
Stanisław Sieniutycz
Keyword(s):  
Chemical Reactions ◽  
Reaction Diffusion ◽  
Transport Processes ◽  
Mass Action ◽  
Nonlinear Kinetics ◽  
Reaction Diffusion Systems ◽  
Thermodynamic Structure ◽  
Far From Equilibrium ◽  
Physical Consequences ◽  
Kinetics Of

Affinity picture — new for transport phenomena — and the traditional Onsagerian picture are shown to constitute two equivalent representations for kinetics of chemical reactions and transfer processes. Two competing directions in elementary chemical or transport steps are analyzed. Nonequilibrium systems are described by equations of nonlinear kinetics of Marcelin-Kohnstamm-de Donder type that contain terms exponential with respect to the Planck potentials and temperature reciprocal. Simultaneously these equations are analytical expressions characterizing the transport of the substance or energy through the energy barrier. We regard kinetics of this sort as potential representations of a generalized law of mass action that includes the effect of transfer phenomena and external fields. We also consider physical consequences of these kinetics closely and far from equilibrium, and show how diverse processes can be described. In these developments we point out the significance of nonlinear symmetries and generalized affinity. Correspondence with the Onsager's theory is shown in the vicinity of thermodynamic equilibrium. Yet, the theory shows that far from equilibrium the rates of transport processes and chemical reactions cannot be determined uniquely in terms of their affinities because these rates depend on all state coordinates of the system.

Reaction Diffusion in the Ni-Bi Binary System

1997 ◽  
Vol 143-147 ◽  
pp. 621-624
Author(s):  
O.V. Duchenko ◽  
P. Feschotte ◽  
G. Burri ◽  
Vasil I. Dybkov
Keyword(s):  
Binary System ◽  
Reaction Diffusion

Irradiation-Driven Compositional Changes in Alloys

2011 ◽  
Vol 1369 ◽  
Author(s):  
Santosh Dubey ◽  
Anter El Azab ◽  
Dieter Wolf
Keyword(s):  
Reaction Diffusion ◽  
Local Defect ◽  
Material System ◽  
Stochastic Point Process ◽  
Random Fashion ◽  
Intrinsic Length ◽  
Compositional Changes ◽  
Compositional Patterns ◽  
Kinetics Of ◽  
Defect Species

ABSTRACTA model to study the formation of compositional patterns in concentrated binary alloys under irradiation is presented. In this model, six atomic and defect species are considered: regular lattice atoms (A and B), dumbbell interstitials (AA, BB and AB) and vacancies. In addition to long range diffusion of these species, local defect-defect (vacancy-interstitial recombination) and defect-atom (dumbbell-atom) reactions have also been considered. The model tracks simultaneous evolution of all the species in reaction-diffusion formalism. Irradiation events are modeled as a stochastic point process which changes the concentration of all the species instantaneously in a random fashion. In each irradiation event, a spatial distribution of point defects (core-shell distribution: core dominated by vacancies and shell by interstitials) has been introduced in the system which drives the kinetics of diffusion and reaction. The model has been non-dimensionalized with respect to intrinsic length and time scales of the material system and solved numerically using finite difference technique. Applying this model to CuAu solid solution, we have shown that the alloy exhibits spinodal-like decomposition with specific steady state wavelengths that depend on the irradiation conditions.

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