Figure 1

Structural characterization by representative SEM scans of as-produced BaSO ₄ nanomaterial and after incubation for testing of persistence. (A) reproduced batch, as-produced powder; (B) NM-220 batch, as-produced powder; (C) pellet of NM-220 after 28d incubation in PBS; (D) pellet of NM-220 after 28d incubation in PSF; (E) pellet of NM-220 after 1d incubation in 0.1 N HCl.