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Crystallization represents the prime example of a disorder order transition.In realistic situations, however, container walls and impurities are frequentlypresent and hence crystallization is heterogeneously seeded. Rarely the seedsare perfectly compatible with the thermodynamically favoured crystal structureand thus induce elastic distortions, which impede further crystal growth. Herewe use a colloidal model system, which not only allows us to quantitativelycontrol the induced distortions but also to visualize and follow heterogeneouscrystallization with single-particle resolution. We determine the sequence ofintermediate structures by confocal microscopy and computer simulations, anddevelop a theoretical model that describes our findings. The crystallite firstgrows on the seed but then, on reaching a critical size, detaches from theseed. The detached and relaxed crystallite continues to grow, except close tothe seed, which now prevents crystallization. Hence, crystallization seedsfacilitate crystallization only during initial growth and then act asimpurities.

Crystallization seeds favour crystallization only during initial growth