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a–d Upper part: overlaid AF4-fractograms (MALS) of non-digested silica NP suspensions, digested but not sonicated suspensions and digested suspensions sonicated with various amounts of energy (150 nm [a] and 80 nm [b] particles). Lower part: overlaid fractograms of 150 nm and 80 nm SiO2-NP non-digested samples and digested but not sonicated samples and their respective geometric radii (nm) recorded with the multi-angle laser light scattering (MALS) detector
