Fig. 2: Morphology analysis in PEC.

Cryo-TEM images of the 0.2 wt% tri(LM)- (a), tri(SM)- (b), penta- (c), and nona-PEC (d). Histogram of core diameter distribution for tri(LM)- (e), tri(SM)- (f), penta- (g), and nona-PEC (h) calculated from cryo-TEM images. The total counts are 200, and the red line is a normal distribution. Core diameters are presented as mean values ± standard deviation. i SANS profiles of tri(LM)- (green open circles), tri(SM)- (olive green open circles), penta- (black open circles), and nona-PEC (blue open circles) with 0.2 wt% polymer concentration. All SANS profiles were fitted by the best model of the form factor of the core-shell sphere (red solid line). j Node diameter of four different PECs. The open rectangle represents cryo-TEM results, and the closed rectangle represents SANS results. Node diameters are presented as mean values ± standard deviation. k Calculated aggregation number of four different PECs. Schematic of the expected ionic block conformations in the coacervate node of tri(LM)- and tri(SM)-PEC (l) and penta- and nona-PEC (m). The gray circle represents the coacervate node, the solid line represents the neutral block, and the dotted line represents the ionic block.