Due to the surface effect of nanoscale particle,the precursor of nanoscale powder prepared by wet process can form aggregation easily, and so cannot be dried by usual techniques.

• 由于纳米粒子的表面效应,用湿法制备出的纳米粉体的前躯体在干燥过程中极易形成团聚,已经不能采用传统的干燥方法。