Anti-aggregation dispersion of ultrafine particles by electrostatic technique

The dispersion of ultrafine particles in the air can be achieved by mechani cal method or surface modification. In this work, the electrostatic techniq ue was first employed for anti-aggregation of ultrafine particles. When the relative humidity of the air is within the region of 70%-75%, effective st orage time of ultrafine particles can reach 72 h after treatment by the ele ctrostatic technique. The experimental results showed that this technique i mparted ultrafine particles much more pronounced anti-aggregation property. In the dry air, the critical diameter of ultrafine particles anti-aggregat ed by the electrostatic technique is the function of particle property and charging field intensity. The critical diameter is inversely proportional t o the square of the charging field intensity.