When density of precipitated slurry is too high, because of the collision among particles, big spindly aggregates which are made of ultra-fines are born in reactor at the action of surface energy.
当体系中浆液密度较高时，颗粒由于相互间的碰撞在表面能的作用下团聚成纺锤形的大颗粒。
The aggregates, composed of the primary particles, retain sufficient water and nutrients.
由原颗粒组成的团聚体要能保持充分的水分和养分。
By using silver nano-aggregates as SERS substrates instead of dispersed silver particles, a great improvement of SERS signal intensity is achieved.
通过利用银纳米粒子聚集体代替单分散的银纳米粒子作为SERS基底，SERS信号得到明显增强。
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