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| - Effect of Surface Elasticity on Ostwald Ripening inEmulsions
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| Abstract
| - The coarsening of droplets in an emulsion with a size distribution that initially is given by the Lifshitz−Slyozov−Wagner (LSW) distribution is studied by means of numerical calculations taking into accountelastic interfacial behavior. Droplets smaller than the critical radius will shrink while droplets larger thanthe critical radius will grow. For a zero interfacial elasticity the stationary LSW distribution is obtainedand its coarsening rate matches theoretical values. The critical droplet radius, number-averaged dropletradius, and volume-surface-averaged droplet radius increase with time. Low interfacial elasticity withrespect to initial interfacial tension causes the initial LSW distribution to become bimodal. The sizedistribution of the coarsening peak can still be described by the LSW distribution. The smaller peak thataccumulates in time has an average radius that depends on the ratio between the interfacial elasticmodulus and the interfacial tension. For large ratios (E/σ > 1), the system goes within a short time to astable situation without changes in particle size with time.
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