Five-dimensional imaging of freezing emulsions with solute effects

• Published in: Science
• Main Authors: Dedovets, Dmytro, Monteux, Cécile, Deville, Sylvain
• Other Authors: Laboratoire de Synthèse et Fonctionnalisation de Céramiques (LSFC), Saint Gobain-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Sciences et Ingénierie de la Matière Molle (SIMM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2018
• Subjects: [CHIM.MATE]Chemical Sciences/Material chemistry; [SPI.MAT]Engineering Sciences [physics]/Materials; Sea ice
• Online Access: https://hal.archives-ouvertes.fr/hal-01794931; https://hal.archives-ouvertes.fr/hal-01794931/document; https://hal.archives-ouvertes.fr/hal-01794931/file/scifile.pdf; https://doi.org/10.1126/science.aar4503

International audience The interaction of objects with a moving solidification front is a common feature of many industrial and natural processes such as metal processing, the growth of single-crystals, the cryopreservation of cells, or the formation of sea ice. Solidification fronts interact with objects with different outcomes, from the total rejection to their complete engulfment. We image the freezing of emulsions in 5D (space, time, and solute concentration) with confocal mi-croscopy. We show the solute induces long-range interactions that determine the solidification microstructure. The local increase of solute concentration enhances premelting, which controls the engulfment of droplets by the front and the evolution of grain boundaries. Freezing emulsions may be a good analogue of many solidification systems where objects interact with a solidification interface. Solidification fronts interact with hard or soft objects such as particles, bubbles, droplets, or cells, in three different ways: objects can be engulfed, rejected for some time and then encapsulated , or rejected for an extended period of time (1). Different outcomes are desired, depending 1