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Persistence of Ceria NM-211 (a), NM-212 (b), and Titania NM-105 (c) as benchmark. Transmission electron microscopy (TEM) and selected area diffraction (SAD) after 28-day incubation in phagolysosomal simulant fluid (PSF) [see Table 1 for dissolution detected by ions in the supernatant (ICP-MS)]. The large almost spherical structures are no contaminations, but are confirmed as Ceria in the same crystalline phase
