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Heat maps for mobility-based apparent density: (a) NP mixtures containing 30 nm, 40 nm, 60 nm, 80 nm and 100 nm AuNPs. (b) Aggregates consisting of 40 nm primary AuNPs. The map indicates a small population with apparent density of 40 g cm−3, which we attribute to particle coincidence and that around 4 g cm−3are due to particle splitting.
