当晶体非常细小的时候，由于晶粒的表面能很大，细小的晶粒之间容易由于弱的相互作用力结合在一起，导致晶粒之间发生团聚，也就是很多个细小晶粒抱团，形成更大的二次颗粒。
二次颗粒物是由气态前驱体在大气中转化而成的。
The secondary PM is transformed in the ambient air by gaseous precursors.
把拌合好的颗粒料回料，再输送到片材机的料斗里面进行第二次加工片材。就这样连续加工循环。
Send the Particles recycled material which is mixed well, to the feeder of the sheet machine, processing of the second sheet producing, in this way continuous processing cycle.
共沉淀法制备的磁性颗粒经二次分散后稳定悬浮于硅油中，得到了硅油基磁流体。
The magnetic particles prepared through coprecipitation suspend stably in the fluid of polydimethylsiloxane after twice dispersing, and so the polydimethylsiloxane based ferrofluid is prepared.
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