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Five-dimensional imaging of freezing emulsions with solute effects
Dmytro Dedovets1, Cécile Monteux2, Sylvain Deville3
1Laboratoire de Synthèse et Fonctionnalisation des Céramiques, UMR 3080 CNRS/Saint-Gobain CREE, Cavaillon, France.
Science (New York, N.Y.)
|April 21, 2018
Summary
We studied how solute concentration affects the freezing of emulsions. Solute-induced interactions control how droplets are engulfed by the solidification front, influencing microstructure formation.
Area of Science:
- Materials Science
- Physical Chemistry
- Biophysics
Background:
- Solidification processes involving object interactions are crucial in diverse fields like materials processing and cryopreservation.
- The interplay between solidification fronts and objects can result in rejection or engulfment, significantly impacting material properties.
- Understanding these interactions is key to controlling microstructural evolution in various applications.
Purpose of the Study:
- To investigate the role of solute concentration in the solidification of emulsions.
- To elucidate the mechanisms of object-solidification front interactions at varying solute levels.
- To establish freezing emulsions as a model system for studying general solidification phenomena.
Main Methods:
- Utilized five-dimensional confocal microscopy to image the dynamic process of emulsion freezing.
- Controlled and varied solute concentration during the solidification experiments.
- Analyzed the resulting microstructures and droplet engulfment behaviors.
Main Results:
- Demonstrated that solute concentration drives long-range interactions between droplets and the solidification front.
- Observed that increased local solute concentration enhances premelting phenomena.
- Showed that premelting directly influences droplet engulfment and grain boundary evolution.
Conclusions:
- Solute-induced interactions are a primary determinant of solidification microstructure in emulsions.
- Premelting, modulated by solute concentration, governs the fate of objects encountering a solidification front.
- Emulsion freezing provides valuable insights into complex solidification systems relevant to industry and nature.
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