Release of Nanoparticles in the Environment and Catalytic ...
From these blocks, sub-samples consisting of 0.3 × 0.3 × 0.2 mm were carefully cut perpendicular to the honeycomb structure of the ceramic monolith. A portion of the total TWC (monolith + washcoat) was pulverised in a ball mill Retsch (Bioblock) model S100. We placed ~20–25 g of sample in a high purity agate (SiO 2