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. Interaction of solidification fronts with objects leads to different outcomes, from total rejection of the objects to their complete engulfment. We imaged the freezing of emulsions in five dimensions (space, time, and solute concentration) with confocal microscopy. We showed that 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 analog of many solidification systems where objects interact with a solidification interface.

/pdf/five-dimensional-imaging-of-freezing-emulsions-with-solute-458rbvffe0.pdf

Five-dimensional imaging of freezing emulsions with solute effects

http://yaoyupan.weebly.com/uploads/2/3/7/1/23711349/to_investigate_interface_shape_and_thermal_stress_during_sapphire_single_crystal_growth_by_the_cz_method.pdf

To investigate interface shape and thermal stress during sapphire single crystal growth by the Cz method

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 microscopy. 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.

/pdf/five-dimensional-imaging-of-freezing-emulsions-with-solute-32s8k6h4iv.pdf

Th. Duffar

Papers

Gas bubbles in shaped sapphire