Ball Milling for Precursor Whiskers

In this study, 10 g of PG were placed in a ball milling jar with a ball-to-material ratio of 10:1, and the milling was conducted at a rotation speed of 300 rev./min (rpm) for 30 min. Under the same experimental conditions, the composition of the raw materials was altered, with varying relative quantities of EMR to PG, specifically 10 wt% (EMR to 90 wt% PG), 15 wt%, 20 wt%, 25 wt%, and 30 wt%, while maintaining the total material (EMR + PG) in the ball mill at 10 g. Ball milling experiments were performed to obtain precursor whiskers with different proportions. In addition, separate ball milling experiments were carried out by individually adding manganese sulfate monohydrate (ranging from 0.5 wt% to 4 wt%) and ammonium sulfate (ranging from 0.25 wt% to 2 wt%) to PG. These experiments aimed to investigate the roles of Mn²⁺and NH₄⁺ during the doping process on the whiskers.