graph 5100, Micromeritics) and the specific surface area was measured by nitrogen adsorption, the BET-method (ASAP 2000, Micromeritics). The particle size distribution (PSD), a narrow or broad distribution, was determined by using the equation: PSD slope=[75% (ESD)-25% (ESD)]/2.APS, where ESD means equivalent spherical diameter and APS means average particle size. Oil absorption, packing index,...