Cold trap using liquid nitrogen to achieve a constant input of rapid cooling, so that rapid nucleation of steam to ensure that the nanometer scale.
冷阱采用了不断输入液氮实现了急速冷却，使蒸汽快速成核以保证纳米尺度。
The measurement scale and the measurement result here can be viewed as the minimum nucleation diameter and the nucleation site density respectively.
这里的测量尺度和测量结果可以分别被视为最小成核直径和汽化核心密度。
PVP played roles of nucleation, balling and dispersion respectively in the whole process. The polyimide microspheres could be prepared in the micro-scale by this way.
PVP在制备过程中分别呈现出成核、成球及分散稳定的作用， 从而实现了聚酰亚胺材料在微米尺度上的微球化。
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