Self-Assembly of Diphenylalanine-Based Nanostructures in Water and Electrolyte Solutions

Figure 6

FTIR spectra of FF nanotubes in 50 mM NaCl and CaCl₂ solutions (a, b) and in water at pH from 3 to 10 (c, d) with zooming in regions with strong IR absorbance. Regions corresponding to amides I and II (a, c) and to amides A and B (b, d).

(a)

(b)

(c)

(d)