Fig. 2From: Size-controlled human adipose-derived stem cell spheroids hybridized with single-segmented nanofibers and their effect on viability and stem cell differentiationCharacterization of the size and superficial chemical composition of SFs and P-SFs. SEM images of (a) single strand SFs and (b) aggregated SFs (scale bar: 50 and 100 μm). High-resolution XPS spectra of carbon peak C 1 s for (c) SF and (d) P-SFBack to article page