Fig. 8
From: Effect of Mn2+ concentration on the growth of δ-MnO2 crystals under acidic conditions
TEM images of δ-MnO2 react with 25 mM Mn2+ at pH 4 about 7 d (a and b), and 15 d (c and d). The SAED pattern (an inset) was recorded by focusing the electron beam in the area of image b. The yellow lines show the side-to-side assembly in image d