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Draw a solid embryo forming at the mould wall and describe the benefits of heterogeneous nucleation at the mould wall compared to homogeneous nucleation. Illustrate
Draw a solid embryo forming at the mould wall and describe the benefits of heterogeneous nucleation at the mould wall compared to homogeneous nucleation. Illustrate your explanation with a second drawing where you plot the free energy change as a function of the radius of the solid embryo for homogeneous and heterogeneous nucleation. Indicate in your plot the region (in terms of radius) where the solid embryo is stable and can grow.
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