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The percentage (a) number and (b) area distributions of 20 nm and 60 nm FS, compared to nanometre-sized Ceridust 3615® (Nano-Ceridust) and nanometre-sized UHMWPE wear particles (Nano-wear); The percentage (c) number and (d) area distributions of 200 nm and 1 μm FS, compared to micrometre-sized UHMWPE wear (Micro-wear-0.1–1.0 μm) and micrometre-sized UHMWPE wear particles (Micro-wear-1.0–10 μm).
