Highlight Photo
Particle property improvement by surface modification through nano-coating
Figure 4. Inter-particle adhesion and tribo-charge reduction
Shown left, a plot of the AOR versus interparticle adhesion force (for five powders samples), showing a linear trend of increasing cohesion with increasing surface asperity and surface energy (their product relates to interparticle force). The plots on right show the effect of dry coating on triboelectric charge (when material flows through tubes made of plastic or steel) of coated versus uncoated micronized acetaminophen (APAP), indicating flow improvement when charge reduction is achieved through dry particle coating of nano-silica. Note that more negative charge to mass ratio indicates highly charging powders; uncoated powder has poor flow, and coating of nano-silica provides better flow (M5 is better than R972 and has negligible charging).
Credits: NJCEP at NJIT
