I remember watching ascorbic acid crystallizing from isopropyl alcohol through a microscope. Crystallization would start at several points, and
propagate outwards as a wave. Once it got so big, the speed of the outward propagation would drop sharply, and finally stop. Once that happened,
nucleation sites on the stalled front would spawn new semicircular waves and the cycle would repeat. Some very interesting dynamics, maybe some sort
of critical slowing-down. |