Abstract
The surface of spherical, positively chargeable acrylic resin core particles (diameter : 10μm)is separately covered, by means of a coacervation process, with two types of negatively chargeable ultra-fine particles(diameter : 3nm or 60nm) in water to obtain two types of surface-treated particles. The surface structure and tribo-charging characteristics of the obtained particles are investigated, respectively, using SEM observation and the amount of tribo-charge q/m that was generated between the surface-treated particles and ferrite carrier particles.
The SEM observation demonstrates that both types of ultra-fine particles uniformly cover the core particle surface. Further, measurement of q/m values shows that the cover layer has negative charge impartation capability and that the amount of negative charge-q/m increases with the increase of coverage by the ultra-fine particles. From the surface morphology and q/m value for various covering ratios by the ultra-fine particles and mixing time with the ferrite carrier, the charging characteristics and surface structure of the obtained surface-treated particles are discussed.
