Transmission electron microscopy (TEM) revealed a dense nanofibrillar network in both cases (Fig. ). However, the size distribution (Fig. ) was significantly wider for the gel formed by Dff and hFF, further supporting the hypothesis that changing amino acid sequence and chirality leads to higher heterogeneity within the nanofibrillar network. This finding raised the question whether such nanomorphological diversity could be ascribed to self-sorting as opposed to co-assembly. Therefore, we sought Fourier-transformed infrared (FT-IR) spectroscopic investigations coupled to atomic force microscopy (AFM).