Fig. 4: Characterization of surface structures in binary ISV + SVPS r-BMAs representing different degrees of size asymmetry.
From: Film surface assemblies from chemically distinct block copolymer micelles
Micelles outlined in the same color (top) are derived from the same BCP (e.g., ISV micelles depicted for \(\alpha\) = 1.8 and \(\alpha\) = 2.3). SEM derived object-based segmentations of a ISV121 + SVPS67, b ISV121 + SVPS53, c ISV138 + SVPS53, and d ISV164 + SVPS53 film surfaces evaporated for 80 s, all made from 75:25 ISV:SVPS (by wt.) solutions blended for 15 min. Red, green, and magenta regions, respectively, represent ISV, SVPS, and the solid matrix. \(\alpha\) denotes BCP size ratio (Mn,ISV/Mn,SVPS). e Quantitative comparison between outcomes of segmentation (s) and modified Voronoi analysis (MVA or v). Averages and standard deviations from three separate regions reported. For MVA, the following correspondence between classification and number of cell edges (nearest neighbors, N) was used: ISV (N = 4), SVPS (N = 6), defect (Def; N ≠ 4 or 6). f–h Monodisperse and j–l polydisperse BD simulation surface snapshots corresponding to size asymmetries of \(\alpha\) = 2.3, 2.6, and 3.1, respectively (“Methods”). i Approximation of BD simulation polydispersity via relative frequencies of five discrete populations (as labeled) derived from the experimental pure film PSD.
