Ostwald Ripening of Concentrated Alkane Emulsions: A preliminary report
| Autor: | Erik Geladé, Bruno De Nijs, Robert Finsy, Jacques Joosten, Luc Deriemaeker, Leon Bremer |
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| Rok vydání: | 1996 |
| Předmět: |
Ostwald ripening
Molecular diffusion Aqueous solution Dodecane food and beverages General Chemistry Condensed Matter Physics chemistry.chemical_compound symbols.namesake chemistry Chemical engineering Pulmonary surfactant Dynamic light scattering Phase (matter) symbols Organic chemistry General Materials Science Solubility |
| Zdroj: | Particle & Particle Systems Characterization. 13:350-353 |
| ISSN: | 0934-0866 |
| DOI: | 10.1002/ppsc.19960130604 |
| Popis: | Fiber optic dynamic light scattering (FODLS) was used to study the kinetics of aging processes in emulsions of n-alkanes stabilized by a surfactant. The method is particularly useful for this purpose because it permits measurements in concentrated emulsions. Complications that may occur in traditional DLS due to the extreme dilution, such as solubilization of the particles in the medium, can be easily avoided in this way. The experimental results show that the main aging process is Ostwald ripening. The results are in agreement with theoretical predictions based on the Lifshitz-Slyozov-Wagner (LSW) theory as far as it concerns the relation between the molecular solubility of the n-alkanes (in the aqueous phase) and the Ostwald ripening rate. This illustrates that the main rate-determining factor is the molecular diffusion of the alkane molecules through the continuous (aqueous) phase. The Ostwald ripening rate is affected by the concentration of surfactant but in all situations is higher than expected from LSW theory. |
| Databáze: | OpenAIRE |
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