Capillary equilibrium and sintering kinetics in dispersed media and catalysts
(2016) Surface Science — Vol. 648, p. 262-270 (2016)
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- Authors
Delannay, Francis 
- Abstract
- The evolution of an aggregate of particles embedded in a fluid phase, no matter whether a liquid, a vapor, or a mixture of both, is determined by the dependence of the equilibrium interface area on porosity volume fraction. In system with open porosity, this equilibrium can be analyzed using a model representing the particles as a collection of cones of revolution, the number ofwhich is the average particle coordination number. The accuracy of themodel has been assessed using in situ X-raymicrotomography. The modelmakes possible the computation of the driving force for sintering, commonly called sintering stress. It allows the mapping of the domains of relative density, coordination number, and dihedral angle that bring about aggregate densification or expansion. The contribution of liquid/vapor interfaces is enlightened, aswell as the dependence of the equilibriumfluid phase distribution on particle size. Applied to foams and emulsions, themodel provides insight into the relationship between osmotic pressure and coordination. Interface-governed transport mechanisms are considered dominant in the macroscopic viscosity. Both sintering stress and viscosity parameters strongly depend on particle size. The capacity of modeling the simultaneous particle growth is thus essential. The analysis highlights the microstructural parameters and material properties needed for kinetics simulation.
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Citations
Delannay, F. (2016). Capillary equilibrium and sintering kinetics in dispersed media and catalysts. Surface Science, 648, 262-270. https://doi.org/10.1016/j.susc.2015.11.004 (Original work published 2016)