Fig. 1

Physicochemical properties of E 171. (A) Characterization of E 171-1 and E 171-2 using TEM and SEM. The scale bar is 200 nm. (B) Crystal structure of E 171-1 and E 171-2 by XRD. (C) E 171 number-based particle size distributions (PSDs) of Fmean determined by TEM