The self assembly of peptide hydrogelators that carry aromatic substituents can be modeled by a novel nanocylindrical architecture. The proposed model suggests that the nanocylinders are formed by anti-parallel β-sheets interlocked by the π-stacking interactions of fluorenyl groups and phenyl rings. This explanation is consistent with the structures observed in TEM and the data obtained by a variety of spectroscopic techniques.
Smith, A., Williams, R., Tang, C., Coppo, P., Collins, R., Turner, M., Saiani, A., & Ulijn, R. V. (2008). Fmoc-diphenylalanine self assembles to a hydrogel via a novel architecture based on π–π interlocked β-sheets. Advanced Materials, 20(1), 37-41. https://doi.org/10.1002/adma.200701221