spontaneous nucleation

spontaneous nucleation

[spän′tā·nē·əs ‚nü·klē′ā·shən]
(meteorology)
The nucleation of a phase change of a substance without the benefit of any seeding nuclei within or otherwise in contact with that substance; examples of such systems are a pure vapor condensing to its pure liquid state, a pure liquid freezing to its pure solid state, and a pure solution crystallizing to yield pure solute crystals.
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In many of the 452 trials, protein crystals grew much earlier, at lower levels of supersaturation, on the minerals than they did when they crystallized by spontaneous nucleation.
Interaction between the polymer and the surface of the nucleating agent is essential in reducing the interfa-cial free energy barrier for spontaneous nucleation and growth, increasing crystallization rate and inducing crystallization at a lower degree of supercooling, i.
The uniformity of the shear-induced layer indicates spontaneous nucleation at the moment of shear, thereby eliciting synchronized growth.

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