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SEM micrographs (A) showing the spherical nanoparticulate texture on the surface of AFEP transformed to vivianite in water after 5 d. (B) Vivianite crystal radial florets showing featureless and smooth surface texture at 1 h (SI 10.19); insets at the upper right corners show zooms of the textures, with a white scale bar of 100 nm.
